ORCID Profile
0000-0001-7536-160X
Current Organisation
UNSW Sydney
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Energy Generation, Conversion and Storage Engineering | Mechanical Engineering | Electrochemistry | Nanotechnology | Functional materials | Nanomaterials | Functional Materials | Systems engineering | Renewable Power and Energy Systems Engineering (excl. Solar Cells) | Atomic, Molecular, Nuclear, Particle and Plasma Physics | Structural Chemistry | Biomaterials | Electrochemistry | Quantum Chemistry | Physical Chemistry (Incl. Structural) | Nanomaterials | Photonics optoelectronics and optical communications | Data Storage Representations | Nanoscale characterisation | Civil engineering | Manufacturing Engineering | Manufacturing Processes and Technologies (excl. Textiles) | Carbon sequestration science | Fire safety engineering | Atomic And Molecular Physics | Electrochemical energy storage and conversion
ANZSRC Socio-Economic Objective (SEO)
Energy Storage, Distribution and Supply not elsewhere classified | Expanding Knowledge in Technology | Expanding Knowledge in the Chemical Sciences | Energy storage | Solar-photoelectric | Synthetic Fibres, Yarns and Fabrics | Medical instrumentation | Integrated systems | Integrated circuits and devices | Hydrogen Production from Renewable Energy | Fuel Cells (excl. Solid Oxide) | Energy Storage (excl. Hydrogen) | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering |
Related Links
Publications
Determination of Ag+ ions by a graphene oxide based dual-output nanosensor with high selectivity
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA00048G
Abstract: A new highly selective chemosensor for Ag + ions was designed and synthesized by covalently introducing well-known fluorophore 1,8-diaminonaphthalene (DAN) onto graphene oxide (GO) sheets.
Sulfated graphene oxide as a hole-extraction layer in high-performance polymer solar cells
Publisher: American Chemical Society (ACS)
Date: 10-07-2012
DOI: 10.1021/JZ300723H
Abstract: In this study, we have rationally designed and successfully developed sulfated graphene oxide (GO-OSO3H) with -OSO3H groups attached to the carbon basal plane of reduced GO surrounded with edge-functionalized -COOH groups. The resultant GO-OSO3H is demonstrated to be an excellent hole extraction layer (HEL) for polymer solar cells (PSCs) because of its proper work function for Ohmic contact with the donor polymer, its reduced basal plane for improving conductivity, and its -OSO3H/-COOH groups for enhancing solubility for solution processing. Compared with that of GO, the much improved conductivity of GO-OSO3H (1.3 S m(-1) vs 0.004 S m(-1)) leads to greatly improved fill factor (0.71 vs 0.58) and power conversion efficiency (4.37% vs 3.34%) of the resulting PSC devices. Moreover, the device performance of GO-OSO3H is among the best reported for intensively studied poly(3-hexylthiophene):[6,6]-phenyl-C61 butyric acid methyl ester (P3HT:PCBM) devices. Our results imply that judiciously functionalized graphene materials can be used to replace existing HEL materials for specific device applications with outstanding performance.
Nanocomposite electrodes for high-performance supercapacitors
Publisher: American Chemical Society (ACS)
Date: 03-03-2011
DOI: 10.1021/JZ200104N
Soluble P3HT-grafted graphene for efficient bilayer-heterojunction photovoltaic devices
Publisher: American Chemical Society (ACS)
Date: 10-09-2010
DOI: 10.1021/NN101671T
Abstract: CH(2)OH-terminated regioregular poly(3-hexylthiophene) (P3HT) was chemically grafted onto carboxylic groups of graphene oxide (GO) via esterification reaction. The resultant P3HT-grafted GO sheets (G-P3HT) are soluble in common organic solvents, facilitating the structure roperty characterization and the device fabrication by solution processing. The covalent linkage and the strong electronic interaction between the P3HT and graphene moieties in G-P3HT were confirmed by spectroscopic analyses and electrochemical measurements. A bilayer photovoltaic device based on the solution-cast G-P3HT/C(60) heterostructures showed a 200% increase of the power conversion efficiency (η = 0.61%) with respect to the P3HT/C(60) counterpart under AM 1.5 illumination (100 mW/cm(2)).
Two-Dimensional Carbon Graphdiyne: Advances in Fundamental and Application Research
Publisher: American Chemical Society (ACS)
Date: 20-07-2023
Heteroatom-Doped Graphitic Carbon Catalysts for Efficient Electrocatalysis of Oxygen Reduction Reaction
Publisher: American Chemical Society (ACS)
Date: 10-11-2015
Direct measurements of interactions between polypeptides and carbon nanotubes
Publisher: American Chemical Society (ACS)
Date: 06-2006
DOI: 10.1021/JP061518D
Abstract: The interactions of various polypeptides with in idual carbon nanotubes (CNTs), both multiwall (MW) and single wall (SW), were investigated by atomic force microscopy (AFM). While adhesion forces arising from electrostatic attraction interactions between the protonated amine groups of polylysine and carboxylic groups on the acid-oxidized multi-wall carbon nanotubes (Ox-MWCNTs) dominate the interaction at a low pH, weaker adhesion forces via the hydrogen bonding between the neutral -NH2 groups of polylysine and -COO- groups of the Ox-MWCNTs were detected at a high pH. The adhesion force was further found to increase with the oxidation time for Ox-MWCNTs and to be negligible for oxidized single-wall carbon nanotubes (Ox-SWCNTs) because carboxylate groups were only attached onto the nanotube tips in the latter whereas onto both the nanotube tips and sidewall in the former. Furthermore, it was demonstrated that proteins containing aromatic moieties, such as polytryptophan, showed a stronger adhesion force with Ox-MWCNTs than that of polylysine because of the additional pi-pi stacking interaction between the polytryptophan chains and CNTs.
Edge Functionalization of Graphene and Two-Dimensional Covalent Organic Polymers for Energy Conversion and Storage
Publisher: Wiley
Date: 04-2016
Abstract: Edge functionalization by selectively attaching chemical moieties at the edge of graphene sheets with minimal damage of the carbon basal plane can impart solubility, film-forming capability, and electrocatalytic activity, while largely retaining the physicochemical properties of the pristine graphene. The resultant edge-functionalized graphene materials (EFGs) are attractive for various potential applications. Here, a focused, concise review on the synthesis of EFGs is presented, along with their 2D covalent organic polymer (2D COP) analogues, as energy materials. The versatility of edge-functionalization is revealed for producing tailor-made graphene and COP materials for efficient energy conversion and storage.
Superhydrophobic electrospun POSS-PMMA copolymer fibres with highly ordered nanofibrillar and surface structures
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B911509A
Abstract: A POSS-PMMA copolymer has been synthesised by conventional free-radical polymerisation reaction. Uniform electrospun fibres from this copolymer showed a water contact angle as high as 165 degrees with a sliding angle as low as 6 degrees . For the first time, we found that the electrospun fibres had a bundled nanofibril secondary structure with an ordered POSS morphology on the fibre surface.
Carbon nanomaterials for high-performance supercapacitors
Publisher: Elsevier BV
Date: 07-2013
Well-defined two dimensional covalent organic polymers: Rational design, controlled syntheses, and potential applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4PY01383B
Abstract: Recent developments in the design, synthesis and application of 2D covalent organic polymers are reviewed, along with some perspectives and challenges.
Rationally designed surfactants for few-layered graphene exfoliation: Ionic groups attached to electron-deficient π-conjugated unit through alkyl spacers
Publisher: American Chemical Society (ACS)
Date: 30-06-2014
DOI: 10.1021/NN502289W
Abstract: Mass production of graphene with low cost and high throughput is very important for practical applications of graphene materials. The most promising approach to produce graphene with low defect content at a large scale is exfoliation of graphite in an aqueous solution of surfactants. Herein, we report a molecular design strategy to develop surfactants by attaching ionic groups to an electron-deficient π-conjugated unit with flexible alkyl spacers. The molecular design strategy enables the surfactant molecules to interact strongly with both the graphene sheets and the water molecules, greatly improving graphene dispersion in water. As the result, a few-layered graphene concentration as high as 1.2-5.0 mg mL(-1) is demonstrated with the surfactant, which is much higher than those (<0.1 mg mL(-1)) obtained with normal aromatic or nonaromatic surfactants. Moreover, the surfactant can be easily synthesized at large scale. The superior performance and convenient synthesis make the surfactant very promising for mass production of graphene.
Highly Rechargeable Lithium-CO2 Batteries with a Boron- and Nitrogen-Codoped Holey-Graphene Cathode
Publisher: Wiley
Date: 16-05-2017
Abstract: Metal-air batteries, especially Li-air batteries, have attracted significant research attention in the past decade. However, the electrochemical reactions between CO
Few-layered graphene quantum dots as efficient hole-extraction layer for high-performance polymer solar cells
Publisher: Elsevier BV
Date: 07-2015
Chemical Approaches to Carbon‐Based Metal‐Free Catalysts
Publisher: Wiley
Date: 15-01-2019
Abstract: Highly active and durable catalysts play a key role in clean energy technologies. However, the high cost, low reserves, and poor stability of noble-metal-based catalysts have hindered the large-scale development of renewable energy. Owing to their low cost, earth abundance, high activity, and excellent stability, carbon-based metal-free catalysts (CMFCs) are promising alternatives to precious-metal-based catalysts. Although many synthetic methods based on solution, surface/interface, solid state, and noncovalent chemistries have been developed for producing numerous CMFCs with erse structures and functionalities, there is still a lack of effective approaches to precisely control the structures of active sites. Therefore, novel chemical approaches are needed for the development of highly active and durable CMFCs that are capable of replacing precious-metal catalysts for large-scale applications. Herein, a comprehensive and critical review on chemical approaches to CMFCs is given by summarizing important advancements, current challenges, and future perspectives in this emerging field. Through such a critical review, our understanding of CMFCs and the associated synthetic processes will be significantly increased.
Transparent and stretchable high-performance supercapacitors based on wrinkled graphene electrodes
Publisher: American Chemical Society (ACS)
Date: 23-12-2014
DOI: 10.1021/NN405939W
Abstract: Transparent and/or stretchable energy storage devices have attracted intense attention due to their unique optical and/or mechanical properties as well as their intrinsic energy storage function. However, it remains a great challenge to integrate transparent and stretchable properties into an energy storage device because the currently developed electrodes are either transparent or stretchable, but not both. Herein, we report a simple method to fabricate wrinkled graphene with high stretchability and transparency. The resultant wrinkled graphene sheets were used as both current collector and electrode materials to develop transparent and stretchable supercapacitors, which showed a high transparency (57% at 550 nm) and can be stretched up to 40% strain without obvious performance change over hundreds of stretching cycles.
A facile synthesis of aliphatic thiol surfactant with tunable length as a stabilizer of gold nanoparticles in organic solvents
Publisher: Elsevier BV
Date: 04-2007
DOI: 10.1016/J.JCIS.2007.01.040
Abstract: Three new aliphatic thiol surfactants were synthesized by reacting alkyl bromide with hexamethyldisilathiane under a mild condition. This approach provides an easy access for the direct synthesis of various different length thiol surfactants which play a crucial role in tuning the properties of gold nanoparticles. Gold nanoparticles encapsulated with one of our synthetic thiols were prepared and well characterized by H NMR, UV-vis, FT-IR, and TEM. The hybrid nanoparticles are very stable in both organic solvents and the solid state.
Growth of junctions in 3D carbon nanotube-graphene nanostructures: A quantum mechanical molecular dynamic study
Publisher: Elsevier BV
Date: 02-2014
Nitrogen-Doped Graphene as Efficient Metal-Free Electrocatalyst for Oxygen Reduction in Fuel Cells
Publisher: American Chemical Society (ACS)
Date: 15-02-2010
DOI: 10.1021/NN901850U
Abstract: Nitrogen-doped graphene (N-graphene) was synthesized by chemical vapor deposition of methane in the presence of ammonia. The resultant N-graphene was demonstrated to act as a metal-free electrode with a much better electrocatalytic activity, long-term operation stability, and tolerance to crossover effect than platinum for oxygen reduction via a four-electron pathway in alkaline fuel cells. To the best of our knowledge, this is the first report on the use of graphene and its derivatives as metal-free catalysts for oxygen reduction. The important role of N-doping to oxygen reduction reaction (ORR) can be applied to various carbon materials for the development of other metal-free efficient ORR catalysts for fuel cell applications, even new catalytic materials for applications beyond fuel cells.
Multifunctional conjugated polymers with main-chain donors and side-chain acceptors for dye sensitized solar cells (DSSCs) and organic photovoltaic cells (OPVs)
Publisher: Wiley
Date: 20-09-2011
Abstract: A novel multifunctional conjugated polymer (RCP-1) composed of an electron-donating backbone (carbazole) and an electron-accepting side chain (cyanoacetic acid) connected through conjugated vinylene and terthiophene has been synthesized and tested as a photosensitizer in two major molecule-based solar cells, namely dye sensitized solar cells (DSSCs) and organic photovoltaic cells (OPVs). Promising initial results on overall power conversion efficiencies of 4.11% and 1.04% are obtained from the basic structure of DSSCs and OPVs based on RCP-1, respectively. The well-defined donor (D)-acceptor (A) structure of RCP-1 has made it possible, for the first time, to reach over 4% of power conversion efficiency in DSSCs with an organic polymer sensitizer and good operation stability.
Multifunctional chemical vapor sensors of aligned carbon nanotube and polymer composites
Publisher: American Chemical Society (ACS)
Date: 13-01-2006
DOI: 10.1021/JA0570335
Abstract: Partially coating perpendicularly aligned carbon nanotube arrays with an appropriate polymer thin film along their tube length provides a novel concept for developing new sensors of high sensitivity, good selectivity, and excellent environmental stability for the detection of a broad class of chemical vapors with low power consumption. The absorption and desorption of chemical vapors by the polymer matrix cause changes in the inter-tube distance and, hence, the surface resistance across the nanotube film. Simple measurements of the resistance change, therefore, constitute the nanotube-polymer chemical vapor sensors. These rationally designed, aligned carbon nanotube-polymer composite films are flexible and can be effectively integrated into many systems for a wide range of potential applications, including their use as multifunctional sensors for sensing chemical vapors, mechanical deformations, thermal and optical exposures.
Flexible and wearable wire-shaped microsupercapacitors based on highly aligned titania and carbon nanotubes
Publisher: Elsevier BV
Date: 2016
Carbon nanocomposite catalysts for oxygen reduction and evolution reactions: From nitrogen doping to transition-metal addition
Publisher: Elsevier BV
Date: 11-2016
Neutron reflectivity study of adsorbed diblock copolymers
Publisher: Springer Science and Business Media LLC
Date: 07-1994
DOI: 10.1007/BF02456717
Photochemical generation of conducting patterns in polybutadiene films
Publisher: American Chemical Society (ACS)
Date: 1996
DOI: 10.1021/MA951054+
Large-Displacement Indentation Testing of Vertically Aligned Carbon Nanotube Arrays
Publisher: Springer Science and Business Media LLC
Date: 27-03-2012
Controlled synthesis and modification of carbon nanotubes and C60 : Carbon nanostructures for advanced polymeric composite materials
Publisher: Wiley
Date: 07-2001
DOI: 10.1002/1521-4095(200107)13:12/13<899::AID-ADMA899>3.0.CO;2-G
Multilevel, multicomponent microarchitectures of vertically-aligned carbon nanotubes for diverse applications
Publisher: American Chemical Society (ACS)
Date: 31-01-2011
DOI: 10.1021/NN102411S
Abstract: A simple multiple contact transfer technique has been developed for controllable fabrication of multilevel, multicomponent microarchitectures of vertically aligned carbon nanotubes (VA-CNTs). Three dimensional (3-D) multicomponent micropatterns of aligned single-walled carbon nanotubes (SWNTs) and multiwalled carbon nanotubes (MWNTs) have been fabricated, which can be used to develop a newly designed touch sensor with reversible electrical responses for potential applications in electronic devices, as demonstrated in this study. The demonstrated dependence of light diffraction on structural transfiguration of the resultant CNT micropattern also indicates their potential for optical devices. Further introduction of various components with specific properties (e.g., ZnO nanorods) into the CNT micropatterns enabled us to tailor such surface characteristics as wettability and light response. Owing to the highly generic nature of the multiple contact transfer strategy, the methodology developed here could provide a general approach for interposing a large variety of multicomponent elements (e.g., nanotubes, nanorods/wires, photonic crystals, etc.) onto a single chip for multifunctional device applications.
Lithium-ion batteries based on vertically-aligned carbon nanotube electrodes and ionic liquid electrolytes
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CP40726D
Abstract: In conjunction with environmentally benign ionic liquid electrolytes, vertically-aligned carbon nanotubes (VA-CNTs) sheathed with and without a coaxial layer of vanadium oxide (V(2)O(5)) were used as both cathode and anode, respectively, to develop high-performance and high-safety lithium-ion batteries. The VA-CNT anode and V(2)O(5)-VA-CNT cathode showed a high capacity (600 mAh g(-1) and 368 mAh g(-1), respectively) with a high rate capability. This led to potential to achieve a high energy density (297 Wh kg(-1)) and power density (12 kW kg(-1)) for the prototype batteries to significantly outperform the current state-of-the-art Li-ion batteries.
Reversible Self‐Assembly of Terpyridine‐Functionalized Graphene Oxide for Energy Conversion
Publisher: Wiley
Date: 11-12-2013
Abstract: Terpyridine-functionalized graphene oxides were prepared for self-assembly into 3D architectures with various metal ions (e.g., Fe, Ru). The resulting electrode materials showed significantly improved electroactivities for efficient energy conversion and storage. They showed promise for application in the oxygen reduction reaction (ORR), photocurrent generation, and supercapacitance.
Etched and doped Co9S8/graphene hybrid for oxygen electrocatalysis
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6EE00054A
Abstract: Simultaneous etching and doping of cobalt sulfides–graphene hybrid with NH 3 -plasma effectively enhances the oxygen electrocatalytic activity.
Tunable assembly of carbon nanospheres on single-walled carbon nanotubes
Publisher: IOP Publishing
Date: 06-07-2010
DOI: 10.1088/0957-4484/21/30/305602
Abstract: We have developed a process for spontaneous assembly of carbon nanospheres on aligned or nonaligned single-walled carbon nanotubes (SWNTs) by virtue of plasma-enhanced chemical vapor deposition (PECVD). The formation of carbon nanospheres with a uniform size of 30-60 nm is a catalyst-free process and strongly dependent on the applied plasma power and other factors. Both co-deposition and post-deposition approaches have been developed for effective assembly of carbon nanospheres on SWNTs. Furthermore, the method developed here also allows us to tailor the density and size of carbon nanospheres along nanotubes in a controllable way. The heterojunction structure based on different types of carbon demonstrated in this study represents a new hybrid manner for building complex systems which are promising for various applications.
Graphene for energy conversion and storage in fuel cells and supercapacitors
Publisher: Elsevier BV
Date: 07-2012
Photophysical and electroluminescent properties of hyperbranched polyfluorenes
Publisher: Wiley
Date: 19-05-2006
Multifunctional quinoxaline containing small molecules with multiple electron-donating moieties: Solvatochromic and optoelectronic properties
Publisher: Elsevier BV
Date: 08-2012
Nanomechanics of individual carbon nanotubes from pyrolytically grown arrays
Publisher: American Physical Society (APS)
Date: 17-07-2000
In-Situ Nanocomposite Synthesis: Arylcarbonylation and Grafting of Primary Diamond Nanoparticles with a Poly(ether−ketone) in Polyphosphoric Acid
Publisher: American Chemical Society (ACS)
Date: 09-12-2008
DOI: 10.1021/MA8019078
Carbon-based metal-free electrocatalysts: from oxygen reduction to multifunctional electrocatalysis
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1CS00219H
Abstract: This article provides a timely and critical review on carbon-based metal-free catalysts for various electrocatalytic reactions, along with the mechanistic and structure–property relationship understanding, current challenges, and future perspectives.
Ultrasonically controlled release and targeted delivery of diclofenac sodium via gelatin magnetic microspheres
Publisher: Elsevier BV
Date: 09-2004
Soluble P3HT-grafted carbon nanotubes: Synthesis and photovoltaic application
Publisher: American Chemical Society (ACS)
Date: 20-07-2010
DOI: 10.1021/MA100917P
Aligned Nanofibers from Polypyrrole/Graphene as Electrodes for Regeneration of Optic Nerve via Electrical Stimulation
Publisher: American Chemical Society (ACS)
Date: 09-03-2016
Abstract: The damage of optic nerve will cause permanent visual field loss and irreversible ocular diseases, such as glaucoma. The damage of optic nerve is mainly derived from the atrophy, apoptosis or death of retinal ganglion cells (RGCs). Though some progress has been achieved on electronic retinal implants that can electrically stimulate undamaged parts of RGCs or retina to transfer signals, stimulated self-repair/regeneration of RGCs has not been realized yet. The key challenge for development of electrically stimulated regeneration of RGCs is the selection of stimulation electrodes with a sufficient safe charge injection limit (Q(inj), i.e., electrochemical capacitance). Most traditional electrodes tend to have low Q(inj) values. Herein, we synthesized polypyrrole functionalized graphene (PPy-G) via a facile but efficient polymerization-enhanced ball milling method for the first time. This technique could not only efficiently introduce electron-acceptor nitrogen to enhance capacitance, but also remain a conductive platform-the π-π conjugated carbon plane for charge transportation. PPy-G based aligned nanofibers were subsequently fabricated for guided growth and electrical stimulation (ES) of RGCs. Significantly enhanced viability, neurite outgrowth and antiaging ability of RGCs were observed after ES, suggesting possibilities for regeneration of optic nerve via ES on the suitable nanoelectrodes.
Origin and predictive principle for selective products of electrocatalytic carbon dioxide reduction
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3TA00336A
Abstract: A computational method, based on DFT and electrical double-layer interface models with explicit hydrogen bonding, is developed to accurately predict potential-dependent reaction pathways, catalytic activity, and product selectivity of CO 2 reduction.
Direct growth of three-dimensional multicomponent micropatterns of vertically aligned single-walled carbon nanotubes interposed with their multi-walled counterparts on Al-activated iron substrates
Publisher: Royal Society of Chemistry (RSC)
Date: 2007
DOI: 10.1039/B703046K
Superior thermal interface via vertically aligned carbon nanotubes grown on graphite foils
Publisher: Springer Science and Business Media LLC
Date: 28-12-2013
DOI: 10.1557/JMR.2012.401
In situelectrochemical high-energy X-ray diffraction using a capillary working electrode cell geometry
Publisher: International Union of Crystallography (IUCr)
Date: 26-05-2017
DOI: 10.1107/S1600577517006282
Abstract: The ability to generate new electrochemically active materials for energy generation and storage with improved properties will likely be derived from an understanding of atomic-scale structure/function relationships during electrochemical events. Here, the design and implementation of a new capillary electrochemical cell designed specifically for in situ high-energy X-ray diffraction measurements is described. By increasing the amount of electrochemically active material in the X-ray path while implementing low- Z cell materials with anisotropic scattering profiles, an order of magnitude enhancement in diffracted X-ray signal over traditional cell geometries for multiple electrochemically active materials is demonstrated. This signal improvement is crucial for high-energy X-ray diffraction measurements and subsequent Fourier transformation into atomic pair distribution functions for atomic-scale structural analysis. As an ex le, clear structural changes in LiCoO 2 under reductive and oxidative conditions using the capillary cell are demonstrated, which agree with prior studies. Accurate modeling of the LiCoO 2 diffraction data using reverse Monte Carlo simulations further verifies accurate background subtraction and strong signal from the electrochemically active material, enabled by the capillary working electrode geometry.
Functional graphene nanomesh foam
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4EE00106K
Vertically aligned carbon nanotube electrodes for lithium-ion batteries
Publisher: Elsevier BV
Date: 02-2011
Redox couple of DNA on multiwalled carbon nanotube modified electrode
Publisher: Wiley
Date: 07-2009
Solution-processable graphene nanomeshes with controlled pore structures
Publisher: Springer Science and Business Media LLC
Date: 17-06-2013
DOI: 10.1038/SREP01996
Soluble conducting polymers from polyisoprene
Publisher: Elsevier BV
Date: 1991
Asymmetrically charged carbon nanotubes by controlled functionalization
Publisher: American Chemical Society (ACS)
Date: 28-08-2008
DOI: 10.1021/NN8002532
Abstract: Surface modification of carbon nanotubes (CNTs) has been widely studied for some years. However, the asymmetric modification of in idual CNTs with different molecular species/nanoparticles at the two end-tips or along the nanotube length is only a recent development. As far as we are aware, no attempt has so far been made to asymmetrically functionalize in idual CNTs with moieties of opposite charges. In this paper, we have demonstrated a simple, but effective, asymmetric modification of the sidewall of CNTs with oppositely charged moieties by plasma treatment and pi-pi stacking interaction. The as-prepared asymmetrically sidewall-functionalized CNTs can be used as a platform for bottom-up self-assembly of complex structures or can be charge-selectively self-assembled onto and/or between electrodes with specific biases under an appropriate applied voltage for potential device applications.
Spin-valve behavior in porous alumina-embedded carbon nanotube array with cobalt nanoparticle spin injectors
Publisher: Elsevier BV
Date: 02-2010
Characterization of multiwalled carbon nanotube-polymethyl methacrylate composite resins as denture base materials
Publisher: Elsevier BV
Date: 04-2014
DOI: 10.1016/J.PROSDENT.2013.07.017
Abstract: Most fractures of dentures occur during function, primarily because of the flexural fatigue of denture resins. The purpose of this study was to evaluate a polymethyl methacrylate denture base material modified with multiwalled carbon nanotubes in terms of fatigue resistance, flexural strength, and resilience. Denture resin specimens were fabricated: control, 0.5 wt%, 1 wt%, and 2 wt% of multiwalled carbon nanotubes. Multiwalled carbon nanotubes were dispersed by sonication. Thermogravimetric analysis was used to determine quantitative dispersions of multiwalled carbon nanotubes in polymethyl methacrylate. Raman spectroscopic analyses were used to evaluate interfacial reactions between the multiwalled carbon nanotubes and the polymethyl methacrylate matrix. Groups with and without multiwalled carbon nanotubes were subjected to a 3-point-bending test for flexural strength. Resilience was derived from a stress and/or strain curve. Fatigue resistance was conducted by a 4-point bending test. Fractured surfaces were analyzed by scanning electron microscopy. One-way ANOVA and the Duncan tests were used to identify any statistical differences (α=.05). Thermogravimetric analysis verified the accurate amounts of multiwalled carbon nanotubes dispersed in the polymethyl methacrylate resin. Raman spectroscopy showed an interfacial reaction between the multiwalled carbon nanotubes and the polymethyl methacrylate matrix. Statistical analyses revealed significant differences in static and dynamic loadings among the groups. The worst mechanical properties were in the 2 wt% multiwalled carbon nanotubes (P<.05), and 0.5 wt% and 1 wt% multiwalled carbon nanotubes significantly improved flexural strength and resilience. All multiwalled carbon nanotubes-polymethyl methacrylate groups showed poor fatigue resistance. The scanning electron microscopy results indicated more agglomerations in the 2% multiwalled carbon nanotubes. Multiwalled carbon nanotubes-polymethyl methacrylate groups (0.5% and 1%) performed better than the control group during the static flexural test. The results indicated that 2 wt% multiwalled carbon nanotubes were not beneficial because of the inadequate dispersion of multiwalled carbon nanotubes in the polymethyl methacrylate matrix. Scanning electron microscopy analysis showed agglomerations on the fracture surface of 2 wt% multiwalled carbon nanotubes. The interfacial bonding between multiwalled carbon nanotubes and polymethyl methacrylate was weak based on the Raman data and dynamic loading results.
Solubilized multi-walled carbon nanotubes with broadband optical limiting effect
Publisher: Elsevier BV
Date: 06-2002
Efficient Oxygen Reduction Reaction (ORR) Catalysts Based on Single Iron Atoms Dispersed on a Hierarchically Structured Porous Carbon Framework
Publisher: Wiley
Date: 19-06-2018
Abstract: Single Fe atoms dispersed on hierarchically structured porous carbon (SA-Fe-HPC) frameworks are prepared by pyrolysis of unsubstituted phthalocyanine/iron phthalocyanine complexes confined within micropores of the porous carbon support. The single-atom Fe catalysts have a well-defined atomic dispersion of Fe atoms coordinated by N ligands on the 3D hierarchically porous carbon support. These SA-Fe-HPC catalysts are comparable to the commercial Pt/C electrode even in acidic electrolytes for oxygen reduction reaction (ORR) in terms of the ORR activity (E
Highly efficient metal-free growth of nitrogen-doped single-walled carbon nanotubes on plasma-etched substrates for oxygen reduction
Publisher: American Chemical Society (ACS)
Date: 07-10-2010
DOI: 10.1021/JA105617Z
Abstract: We have for the first time developed a simple plasma-etching technology to effectively generate metal-free particle catalysts for efficient metal-free growth of undoped and/or nitrogen-doped single-walled carbon nanotubes (CNTs). Compared with undoped CNTs, the newly produced metal-free nitrogen-containing CNTs were demonstrated to show relatively good electrocatalytic activity and long-term stability toward oxygen reduction reaction (ORR) in an acidic medium. Owing to the highly generic nature of the plasma etching technique, the methodology developed in this study can be applied to many other substrates for efficient growth of metal-free CNTs for various applications, ranging from energy related to electronic and to biomedical systems.
Nitrogen, Phosphorus, and Fluorine Tri-doped Graphene as a Multifunctional Catalyst for Self-Powered Electrochemical Water Splitting
Publisher: Wiley
Date: 06-10-2016
Abstract: Electrocatalysts are required for clean energy technologies (for ex le, water-splitting and metal-air batteries). The development of a multifunctional electrocatalyst composed of nitrogen, phosphorus, and fluorine tri-doped graphene is reported, which was obtained by thermal activation of a mixture of polyaniline-coated graphene oxide and ammonium hexafluorophosphate (AHF). It was found that thermal decomposition of AHF provides nitrogen, phosphorus, and fluorine sources for tri-doping with N, P, and F, and simultaneously facilitates template-free formation of porous structures as a result of thermal gas evolution. The resultant N, P, and F tri-doped graphene exhibited excellent electrocatalytic activities for the oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER). The trifunctional metal-free catalyst was further used as an OER-HER bifunctional catalyst for oxygen and hydrogen gas production in an electrochemical water-splitting unit, which was powered by an integrated Zn-air battery based on an air electrode made from the same electrocatalyst for ORR. The integrated unit, fabricated from the newly developed N, P, and F tri-doped graphene multifunctional metal-free catalyst, can operate in ambient air with a high gas production rate of 0.496 and 0.254 μL s
Plasma patterning of carbon nanotubes
Publisher: AIP Publishing
Date: 08-05-2000
DOI: 10.1063/1.126454
Carbon‐Based Electrocatalysts for Acidic Oxygen Reduction Reaction
Publisher: Wiley
Date: 02-2023
Abstract: Oxygen reduction reaction (ORR) is vital for clean and renewable energy technologies, which require no fossil fuel but catalysts. Platinum (Pt) is the best‐known catalyst for ORR. However, its high cost and scarcity have severely hindered renewable energy devices (e.g., fuel cells) for large‐scale applications. Recent breakthroughs in carbon‐based metal‐free electrochemical catalysts (C‐MFECs) show great potential for earth‐abundant carbon materials as low‐cost metal‐free electrocatalysts towards ORR in acidic media. This article provides a focused, but critical review on C‐MFECs for ORR in acidic media with an emphasis on advances in the structure design and synthesis, fundamental understanding of the structure‐property relationship and electrocatalytic mechanisms, and their applications in proton exchange membrane fuel cells. Current challenges and future perspectives in this emerging field are also discussed.
Novel [60]fullerene-silver nanocomposite with large optical limiting effect
Publisher: Elsevier BV
Date: 08-2001
Metalated graphene nanoplatelets and their uses as anode materials for lithium-ion batteries
Publisher: IOP Publishing
Date: 16-11-2017
Pyrolysis of Animal Bones with Vitamin B12: A Facile Route to Efficient Transition Metal-Nitrogen-Carbon (TM-N-C) Electrocatalysts for Oxygen Reduction
Publisher: Wiley
Date: 25-01-2016
Abstract: By pyrolyzing cattle bones, hierarchical porous carbon (HPC) networks with a high surface area (2520 m(2) g(-1) ) and connected pores were prepared at a low cost and large scale. Subsequent co-pyrolysis of HPC with vitamin B12 resulted in the formation of three-dimensional (3D) hierarchically structured porous cobalt-nitrogen-carbon (Co-N-HPC) electrocatalysts with a surface area as high as 859 m(2) g(-1) as well as a higher oxygen reduction reaction (ORR) electrocatalytic activity, better operation stability, and higher tolerance to methanol than the commercial Pt/C catalyst in alkaline electrolyte.
Hybrid Carbon Fibers/Carbon Nanotubes Structures for Next Generation Polymeric Composites
Publisher: Hindawi Limited
Date: 2010
DOI: 10.1155/2010/860178
Abstract: Pitch-based carbon fibers are commonly used to produce polymeric carbon fiber structural composites. Several investigations have reported different methods for dispersing and subsequently aligning carbon nanotubes (CNTs) as a filler to reinforce polymer matrix. The significant difficulty in dispersing CNTs suggested the controlled-growth of CNTs on surfaces where they are needed. Here we compare between two techniques for depositing the catalyst iron used toward growing CNTs on pitch-based carbon fiber surfaces. Electrochemical deposition of iron using pulse voltametry is compared to DC magnetron iron sputtering. Carbon nanostructures growth was performed using a thermal CVD system. Characterization for comparison between both techniques was compared via SEM, TEM, and Raman spectroscopy analysis. It is shown that while both techniques were successful to grow CNTs on the carbon fiber surfaces, iron sputtering technique was capable of producing more uniform distribution of iron catalyst and thus multiwall carbon nanotubes (MWCNTs) compared to MWCNTs grown using the electrochemical deposition of iron.
Polyelectrolyte-Functionalized Graphene as Metal-Free Electrocatalysts for Oxygen Reduction
Publisher: American Chemical Society (ACS)
Date: 29-07-2011
DOI: 10.1021/NN200879H
Abstract: Poly(diallyldimethylammonium chloride), PDDA, was used as an electron acceptor for functionalizing graphene to impart electrocatalytic activity for the oxygen reduction reaction (ORR) in fuel cells. Raman and X-ray photoelectron spectroscopic measurements indicate the charge transfer from graphene to PDDA. The resultant graphene positively charged via intermolecular charge-transfer with PDDA was demonstrated to show remarkable electrocatalytic activity toward ORR with better fuel selectivity, tolerance to CO posing, and long-term stability than that of the commercially available Pt/C electrode. The observed ORR electrocatalytic activity induced by the intermolecular charge-transfer provides a general approach to various carbon-based metal-free ORR catalysts for oxygen reduction.
PH and temperature modulated aggregation of hydrophilic gold nanorods with perylene dyes and carbon nanotubes
Publisher: American Chemical Society (ACS)
Date: 21-03-2013
DOI: 10.1021/JP400788H
Random coils of polyisoprene in solution-a small angle x-ray scattering study
Publisher: Elsevier BV
Date: 05-1993
Identification of catalytic sites for oxygen reduction and oxygen evolution in N-doped graphene materials: Development of highly efficient metal-free bifunctional electrocatalyst
Publisher: American Association for the Advancement of Science (AAAS)
Date: 04-2016
Abstract: Doping of graphene with nitrogen imparted bifunctional electrocatalytic activities for efficient energy conversion and storage.
Fluorescence Quenching: Size- and Shape-Dependent Fluorescence Quenching of Gold Nanoparticles on Perylene Dye (Advanced Optical Materials 8/2013)
Publisher: Wiley
Date: 08-2013
Electrochemical sensors based on architectural diversity of the π-conjugated structure: Recent advancements from conducting polymers and carbon nanotubes
Publisher: CSIRO Publishing
Date: 2007
DOI: 10.1071/CH06470
Abstract: Conjugated conducting polymers and carbon nanotubes, both of which possess a conjugated structure of alternating carbon–carbon single and double bonds for the delocalization of π-electrons, are two important classes of electrochemical sensing materials. The combination of carbon nanotubes with conducting polymers or other functional materials (e.g., DNA chains, proteins, metal nanoparticles, carbon fibres) was found to create synergetic effects, that provide the basis for the development of numerous novel sensors with a high sensitivity, good selectivity, excellent environmental stability, and low power consumption. This article reviews recent developments in this exciting new area of electrochemical sensing by presenting the rational strategy of the author’s group in the design and characterization of these new electrochemical sensors based on architectural ersity of the π-conjugated structure.
Polymer-metal schottky contact with direct-current outputs
Publisher: Wiley
Date: 07-12-2016
Abstract: A freestanding conducting polymer plate with one side forming a Schottky contact and the other side an Ohmic contact with two different metal electrodes can generate a DC voltage with an output current density as high as 218.6 μA cm(-2) upon mechanical deformation.
3D graphene based materials for energy storage
Publisher: Elsevier BV
Date: 10-2015
Carbon Nanomaterials for Advanced Energy Systems: Advances in Materials Synthesis and Device Applications
Publisher: Wiley
Date: 03-10-2015
Fluorescent carbon dots from milk by microwave cooking
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA06120F
Abstract: Fluorescent carbon dots were synthesized from milk by microwave cooking and used for two-photon excited in vitro cell imaging.
Graphene oxide nanoribbon as hole extraction layer to enhance efficiency and stability of polymer solar cells
Publisher: Wiley
Date: 25-10-2014
Abstract: Graphene oxide nanoribbons for efficient and stable polymer solar cells are discussed. With controllable bandgap, good solubility and film forming property, graphene oxide nanoribbons serve as a new class of excellent hole extraction materials for efficient and stable polymer solar cells outperforming their counterparts based on conventional hole extraction materials, including PEDOT:PSS.
Textile electrodes woven by carbon nanotube-graphene hybrid fibers for flexible electrochemical capacitors
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3NR00320E
Abstract: Functional graphene-based fibers are promising as new types of flexible building blocks for the construction of wearable architectures and devices. Unique one-dimensional (1D) carbon nanotubes (CNTs) and 2D graphene (CNT/G) hybrid fibers with a large surface area and high electrical conductivity have been achieved by pre-intercalating graphene fibers with Fe3O4 nanoparticles for subsequent CVD growth of CNTs. The CNT/G hybrid fibers can be further woven into textile electrodes for the construction of flexible supercapacitors with a high tolerance to the repeated bending cycles. Various other applications, such as catalysis, separation, and adsorption, can be envisioned for the CNT/G hybrid fibers.
Electrochemical behaviour of polyacetylene-polyisoprene copolymers
Publisher: Royal Society of Chemistry (RSC)
Date: 1993
DOI: 10.1039/FT9938900277
Chronic interfacing with the autonomic nervous system using carbon nanotube (CNT) yarn electrodes
Publisher: Springer Science and Business Media LLC
Date: 15-09-2017
DOI: 10.1038/S41598-017-10639-W
Abstract: The ability to reliably and safely communicate chronically with small diameter (100–300 µm) autonomic nerves could have a significant impact in fundamental biomedical research and clinical applications. However, this ability has remained elusive with existing neural interface technologies. Here we show a new chronic nerve interface using highly flexible materials with axon-like dimensions. The interface was implemented with carbon nanotube (CNT) yarn electrodes to chronically record neural activity from two separate autonomic nerves: the glossopharyngeal and vagus nerves. The recorded neural signals maintain a high signal-to-noise ratio ( dB) in chronic implant models. We further demonstrate the ability to process the neural activity to detect hypoxic and gastric extension events from the glossopharyngeal and vagus nerves, respectively. These results establish a novel, chronic platform neural interfacing technique with the autonomic nervous system and demonstrate the possibility of regulating internal organ function, leading to new bioelectronic therapies and patient health monitoring.
Iodine-induced uncoiling of polyisoprene random coils in solution
Publisher: Elsevier BV
Date: 12-1994
Template-free electrodeposition of multicomponent metal nanoparticles for region-specific growth of interposed carbon nanotube micropatterns
Publisher: IOP Publishing
Date: 09-08-2005
DOI: 10.1088/0957-4484/16/10/023
Abstract: We have demonstrated that multicomponent carbon nanotube micropatterns, in which different nanotubes are interposed in an intimate fashion, can be prepared by pyrolytic growth of carbon nanotubes on interposed micropatterns of different metal nanoparticles generated by template-free pulsed electrodeposition of metal-containing salts onto a photolithographically prepatterned conductive surface at different peak potentials. The resultant multicomponent interposed carbon nanotube micropatterns should have important implications for the construction of multicomponent and multifunctional nanomaterials and nanodevices based on carbon nanotubes for a wide range of potential applications.
Electrochemistry of carboxylated nanodiamond films
Publisher: Springer Science and Business Media LLC
Date: 29-05-2012
Asymmetrically functionalized graphene for photodependent diode rectifying behavior
Publisher: Wiley
Date: 06-06-2011
High‐Performance, Long‐Life, Rechargeable Li–CO 2 Batteries based on a 3D Holey Graphene Cathode Implanted with Single Iron Atoms
Publisher: Wiley
Date: 28-02-2020
Design Principles for Heteroatom-Doped Carbon Nanomaterials as Highly Efficient Catalysts for Fuel Cells and Metal-Air Batteries
Publisher: Wiley
Date: 29-09-2015
Abstract: Oxygen reduction reaction/oxygen evolution reaction (ORR/OER) catalytic activities of p-orbital heteroatom-doped carbon nanomaterials are demonstrated to correlate to the combination of the electron affinity and electronegativity of doping elements, which serves as an activity descriptor for the entire family of p-block element dopants. Such a descriptor has predictive power and enables effective design of new bifunctional catalysts with enhanced ORR/OER activities.
A chemical route for producing polyacetylene-polypyrrole conducting composites
Publisher: Springer Science and Business Media LLC
Date: 1992
DOI: 10.1007/BF00730491
Conformal load-bearing polymer-carbon nanotube antennas and RF front-ends
Publisher: IEEE
Date: 06-2009
Surface adsorption and replacement of acid-oxidized single-walled carbon nanotubes and poly(vinyl pyrrolidone) chains
Publisher: Hindawi Limited
Date: 08-10-2007
DOI: 10.1155/2007/17378
Abstract: Quartz crystal microbalance (QCM) was used to investigate the adsorption of acid-oxidized single-walled carbon nanotubes (Ox-SWNTs) and poly(vinyl pyrrolidone), PVP. It was found for the first time that Ox-SWNTs adsorbed onto the QCM electrode can be effectively replaced by PVP chains in an aqueous solution. This replacement process was also investigated by atomic force miscroscopic (AFM) imaging, which shows good agreement with the QCM measurements. This study provides powerful tools for fundamental investigation of polymer-nanotube interactions and for controlled design/fabrication of functional polymer-nanotube surfaces for potential applications.
Vertically aligned carbon nanotube arrays co-doped with phosphorus and nitrogen as efficient metal-free electrocatalysts for oxygen reduction
Publisher: American Chemical Society (ACS)
Date: 21-09-2012
DOI: 10.1021/JZ3011833
Abstract: Using a mixture of ferrocene, pyridine, and triphenylphosphine as precursors for injection-assisted chemical vapor deposition (CVD), we prepared the first vertically aligned multiwalled carbon nanotube array co-doped with phosphorus (P) and nitrogen (N) with a relatively high P-doping level (designated as PN-ACNT). We have also demonstrated the potential applications of the resultant PN-ACNTs as high-performance electrocatalysts for the oxygen reduction reaction (ORR). PN-ACNT arrays were shown to exhibit a high ORR electrocatalytic activity, superb long-term durability, and good tolerance to methanol and carbon monoxide, significantly outperforming their counterparts doped with P (P-ACNT) or N (N-ACNT) only and even comparable to the commercially available Pt-C catalyst (45 wt % Pt on Vulcan XC-72R E-TEK) due to a demonstrated synergetic effect arising from the co-doping of CNTs with both P and N.
Substrate-enhanced electroless deposition of metal nanoparticles on carbon nanotubes
Publisher: American Chemical Society (ACS)
Date: 19-07-2005
DOI: 10.1021/JA053479+
Abstract: By simply supporting carbon nanotubes with a metal substrate of a redox potential lower than that of the metal ions to be reduced into nanoparticles, we have developed a facile yet versatile and effective substrate-enhanced electroless deposition (SEED) method for functionalizing nanotubes with a large variety of metal nanoparticles, including those otherwise impossible by more conventional electroless deposition methods, in the absence of any additional reducing agent. The nanotube-supported metal nanoparticles thus produced are electrochemically active, and the newly developed SEED process represents a significant advance in functionalization of carbon nanotubes with metal nanoparticles for a wide range of potential applications, including in advanced sensing and catalytic systems.
Advanced gecko-foot-mimetic dry adhesives based on carbon nanotubes
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2NR33027J
Abstract: Geckos can run freely on vertical walls and even ceilings. Recent studies have discovered that gecko's extraordinary climbing ability comes from a remarkable design of nature with nanoscale beta-keratin elastic hairs on their feet and toes, which collectively generate sufficiently strong van der Waals force to hold the animal onto an opposing surface while at the same time disengaging at will. Vertically aligned carbon nanotube (VA-CNT) arrays, resembling gecko's adhesive foot hairs with additional superior mechanical, chemical and electrical properties, have been demonstrated to be a promising candidate for advanced fibrillar dry adhesives. The VA-CNT arrays with tailor-made hierarchical structures can be patterned and/or transferred onto various flexible substrates, including responsive polymers. This, together with recent advances in nanofabrication techniques, could offer 'smart' dry adhesives for various potential applications, even where traditional adhesives cannot be used. A detailed understanding of the underlying mechanisms governing the material properties and adhesion performances is critical to the design and fabrication of gecko inspired CNT dry adhesives of practical significance. In this feature article, we present an overview of recent progress in both fundamental and applied frontiers for the development of CNT-based adhesives by summarizing important studies in this exciting field, including our own work.
Characteristics of output voltage and current of integrated nanogenerators
Publisher: AIP Publishing
Date: 12-01-2009
DOI: 10.1063/1.3072362
Abstract: Owing to the anisotropic property and small output signals of the piezoelectric nanogenerators (NGs) and the influence of the measurement system and environment, identification of the true signal generated by the NG is critical. We have developed three criteria: Schottky behavior test, switching-polarity tests, and linear superposition of current and voltage tests. The 11 tests can effectively rule out the system artifacts, whose sign does not change with the switching measurement polarity, and random signals, which might change signs but cannot consistently add up or cancel out under designed connection configurations. This study establishes the standards for designing and scale up of integrated nanogenerators.
Earth-abundant carbon catalysts for renewable generation of clean energy from sunlight and water
Publisher: Elsevier BV
Date: 11-2017
Biomechanics of gecko locomotion: The patterns of reaction forces on inverted, vertical and horizontal substrates
Publisher: IOP Publishing
Date: 04-02-2015
DOI: 10.1088/1748-3190/10/1/016019
Abstract: The excellent locomotion ability of geckos on various rough and/or inclined substrates has attracted scientists' attention for centuries. However, the moving ability of gecko-mimicking robots on various inclined surfaces still lags far behind that of geckos, mainly because our understanding of how geckos govern their locomotion is still very poor. To reveal the fundamental mechanism of gecko locomotion and also to facilitate the design of gecko-mimicking robots, we have measured the reaction forces (RFs) acting on each in idual foot of moving geckos on inverted, vertical and horizontal substrates (i.e. ceiling, wall and floor), have associated the RFs with locomotion behaviors by using high-speed camera, and have presented the relationships of the force components with patterns of reaction forces (PRFs). Geckos generate different PRF on ceiling, wall and floor, that is, the PRF is determined by the angles between the direction of gravity and the substrate on which geckos move. On the ceiling, geckos produce reversed shear forces acting on the front and hind feet, which pull away from the body in both lateral and fore-aft directions. They use a very large supporting angle from 21° to 24° to reduce the forces acting on their legs and feet. On the floor, geckos lift their bodies using a supporting angle from 76° to 78°, which not only decreases the RFs but also improves their locomotion ability. On the wall, geckos generate a reliable self-locking attachment by using a supporting angle of 14.8°, which is only about half of the critical angle of detachment.
Next‐Generation Energy Harvesting and Storage Technologies for Robots Across All Scales
Publisher: Wiley
Date: 12-06-2022
Abstract: Self‐powered untethered robots that can meander unrestrictedly, squeeze into small spaces, and operate in erse harsh environments have received immense attention in recent years. As there is not a universal solution that can be applied to power robots with erse forms, service functions, and a broad size range from nanometers to meters, the design, fabrication, and implementation of power systems with a suitable weight, desired power and operation duration, and adaptiveness to confined spaces and operation conditions represent one of the greatest challenges in robotic research. Herein, an overview of recent progress and challenges in developing the next‐generation energy harvesting and storage technologies is provided, including direct energy harvesting, energy storage and conversion, and wireless energy transmission for robots across all scales.
Porous Core-Shell Fe3C Embedded N-doped Carbon Nanofibers as an Effective Electrocatalysts for Oxygen Reduction Reaction.
Publisher: American Chemical Society (ACS)
Date: 03-02-2016
Abstract: The development of nonprecious-metal-based electrocatalysts with high oxygen reduction reaction (ORR) activity, low cost, and good durability in both alkaline and acidic media is very important for application of full cells. Herein, we developed a facile and economical strategy to obtain porous core-shell Fe3C embedded nitrogen-doped carbon nanofibers (Fe3C@NCNF-X, where X denotes pyrolysis temperature) by electrospinning of polyvinylidene fluoride (PVDF) and FeCl3 mixture, chemical vapor phase polymerization of pyrrole, and followed by pyrolysis of composite nanofibers at high temperatures. Note that the FeCl3 and polypyrrole acts as precursor for Fe3C core and N-doped carbon shell, respectively. Moreover, PVDF not only plays a role as carbon resources, but also provides porous structures due to hydrogen fluoride exposure originated from thermal decomposition of PVDF. The resultant Fe3C@NCNF-X catalysts, particularly Fe3C@NCNF-900, showed efficient electrocatalytic performance for ORR in both alkaline and acidic solutions, which are attributed to the synergistic effect between Fe3C and N-doped carbon as catalytic active sites, and carbon shell protects Fe3C from leaching out. In addition, the Fe3C@NCNF-X catalyst displayed a better long-term stability, free from methanol crossover and CO-poisoning effects than those of Pt/C, which is of great significance for the design and development of advanced electrocatalysts based on nonprecious metals.
Electrospun single-walled carbon nanotube/polyvinyl alcohol composite nanofibers: Structure-property relationships
Publisher: IOP Publishing
Date: 12-06-2008
DOI: 10.1088/0957-4484/19/30/305702
Abstract: Polyvinyl alcohol (PVA) nanofibers and single-walled carbon nanotube (SWNT)/PVA composite nanofibers have been produced by electrospinning. An apparent increase in the PVA crystallinity with a concomitant change in its main crystalline phase and a reduction in the crystalline domain size were observed in the SWNT/PVA composite nanofibers, indicating the occurrence of a SWNT-induced nucleation crystallization of the PVA phase. Both the pure PVA and SWNT/PVA composite nanofibers were subjected to the following post-electrospinning treatments: (i) soaking in methanol to increase the PVA crystallinity, and (ii) cross-linking with glutaric dialdehyde to control the PVA morphology. Effects of the PVA morphology on the tensile properties of the resultant electrospun nanofibers were examined. Dynamic mechanical thermal analyses of both pure PVA and SWNT/PVA composite electrospun nanofibers indicated that SWNT-polymer interaction facilitated the formation of crystalline domains, which can be further enhanced by soaking the nanofiber in methanol and/or cross-linking the polymer with glutaric dialdehyde.
BCN Graphene as Efficient Metal-Free Electrocatalyst for the Oxygen Reduction Reaction
Publisher: Wiley
Date: 16-03-2012
Multiwalled carbon nanotubes with chemically grafted polyetherimides
Publisher: American Chemical Society (ACS)
Date: 22-06-2005
DOI: 10.1021/JA050924S
Abstract: Covalent attachment of a non-fluorinated polyetherimide onto the surface of carboxylic acid-functionalized multiwalled carbon nanotubes (MWNTs) has been achieved via grafting reactions. This confirms for the first time that the grafting reaction occurs at the nanotube surface when the carboxylic acid-functionalized MWNTs react with the polyetherimide with amine-terminated groups, through both amide and imide linkages formed at the interface between the carbon nanotubes and the polyetherimide. Additionally, an increase in the average molecular weight is detected in gel permeation chromatography when the polyetherimide is chemically attached onto the nanotubes. More interestingly, the chemical bonding at the interface provides much better interfacial adhesion and mechanical stress transfer, evidenced by a significant improvement in mechanical properties. As a result of the chemical attachment, the carbon nanotube-reinforced polyetherimide composite films have enhanced electrical conductivity, thermal deformation temperatures, and mechanical properties.
Edge-selectively halogenated graphene nanoplatelets (XGnPs, X = Cl, Br, or I) prepared by ball-milling and used as anode materials for lithium-ion batteries
Publisher: Wiley
Date: 19-09-2014
Abstract: Edge-selectively halogenated graphene nanoplatelets (XGnPs, X = Cl, Br, or I) are prepared by a simple mechanochemical ball-milling method, which allows low-cost and scalable production of XGnPs as highly stable anode materials for lithium-ion batteries.
High-Performance Polymer Solar Cells Containing Carbon Nanomaterials
Publisher: Wiley
Date: 03-10-2015
Electrochemical C–N coupling of CO2 and nitrogenous small molecules for the electrosynthesis of organonitrogen compounds
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2CS00381C
Abstract: Electrochemical C–N coupling reaction by renewable electricity for the electrosynthesis of organonitrogen compounds with the abundant CO 2 and nitrogenous small molecules as carbon and nitrogen sources, respectively, is a promising sustainable synthetic strategy.
Organo-soluble porphyrin mixed monolayer-protected gold nanorods with intercalated fullerenes
Publisher: American Chemical Society (ACS)
Date: 28-03-2012
DOI: 10.1021/LA300096N
Abstract: Organo-soluble porphyrin mixed monolayer-protected gold nanorods were synthesized and characterized. The resulting gold nanorods encapsulated by both porphyrin thiol and alkyl thiol on their entire surface with strong covalent Au-S linkages were very stable in organic solvents without aggregation or decomposition and exhibited unique optical properties different from their corresponding spherical ones. Alkyl thiol acts as a stabilizer not only to fill up the potential space on gold nanorod surface between bulky porphyrin molecules but also to provide space for further insertion of C(60) molecules forming a stable C(60)-porphyrin-gold nanorod hybrid nanostructure.
Preparation of cells for assessing ultrastructural localization of nanoparticles with transmission electron microscopy
Publisher: Springer Science and Business Media LLC
Date: 25-03-2010
DOI: 10.1038/NPROT.2010.2
Abstract: We describe the use of transmission electron microscopy (TEM) for cellular ultrastructural examination of nanoparticle (NP)-exposed biomaterials. Preparation and imaging of electron-transparent thin cell sections with TEM provides excellent spatial resolution (approximately 1 nm), which is required to track these elusive materials. This protocol provides a step-by-step method for the mass-basis dosing of cultured cells with NPs, and the process of fixing, dehydrating, staining, resin embedding, ultramicrotome sectioning and subsequently visualizing NP uptake and translocation to specific intracellular locations with TEM. In order to avoid potential artifacts, some technical challenges are addressed. Based on our results, this procedure can be used to elucidate the intracellular fate of NPs, facilitating the development of biosensors and therapeutics, and provide a critical component for understanding NP toxicity. This protocol takes approximately 1 week.
Boosting electrocatalytic activities of plasmonic metallic nanostructures by tuning the kinetic pre-exponential factor
Publisher: Elsevier BV
Date: 10-2017
High Performance Heteroatoms Quaternary-doped Carbon Catalysts Derived from Shewanella Bacteria for Oxygen Reduction
Publisher: Springer Science and Business Media LLC
Date: 25-11-2015
DOI: 10.1038/SREP17064
Abstract: A novel heteroatoms (N, P, S and Fe) quaternary-doped carbon (HQDC-X, X refers to the pyrolysis temperature) can be fabricated by directly pyrolyzing a gram-negative bacteria, S. oneidensis MR-1 as precursors at 800 °C, 900 °C and 1000 °C under argon atmosphere. These HQDC-X catalysts maintain the cylindrical shape of bacteria after pyrolysis under high temperatures, while heteroatoms including N, P, S and Fe distribute homogeneously on the carbon frameworks. As a result, HQDC-X catalysts exhibit excellent electrocatalytic activity for ORR via a dominant four-electron oxygen reduction pathway in alkaline medium, which is comparable with that of commercial Pt/C. More importantly, HQDC-X catalysts show better tolerance for methanol crossover and CO poisoning effects, long-term durability than commercial Pt/C, which could be promising alternatives to costly Pt-based electrocatalysts for ORR. The method may provide a promising avenue to develop cheap ORR catalysts from inexpensive, scalable and biological recursors.
Conducting polyaniline nanotubes by template-free polymerization
Publisher: American Chemical Society (ACS)
Date: 11-01-2001
DOI: 10.1021/MA001525E
Bending instability of an embedded double-walled carbon nanotube based on Winkler and van der Waals models
Publisher: Elsevier BV
Date: 07-2005
Three-dimensional B,N-doped graphene foam as a metal-free catalyst for oxygen reduction reaction
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3CP51942B
Abstract: Using a modified chemical vapor deposition (CVD) method, we have prepared a class of new graphene foams (GFs) doped with nitrogen, boron or both. Nitrogen-doped graphene foams (N-GFs) with a nitrogen doping level of 3.1 atom% were prepared by CVD of CH4 in the presence of NH3 while boron-doped graphene foams (B-GFs) with a boron doping level of 2.1 atom% were produced by using toluene and triethyl borate as a carbon and a boron source. On the other hand, graphene foams co-doped with nitrogen (4.5 atom%) and boron (3 atom%) (BN-GFs) were prepared by CVD using melamine diborate as the precursor. In all cases, scanning electron microscope (SEM) images revealed well-defined foam-like microstructures, while electrochemical measurements showed much higher electrocatalytic activities toward oxygen reduction reaction for the doped graphene foams than their undoped counterparts.
Bistriphenylamine-based organic sensitizers with high molar extinction coefficients for dye-sensitized solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2RA20798B
Formation of large-area nitrogen-doped graphene film prepared from simple solution casting of edge-selectively functionalized graphite and its electrocatalytic activity
Publisher: American Chemical Society (ACS)
Date: 02-08-2011
DOI: 10.1021/CM201542M
Optoelectronic property modeling of carbon nanotubes grafted with gold nanoparticles
Publisher: IOP Publishing
Date: 12-05-2008
DOI: 10.1088/0957-4484/19/24/245702
Abstract: A three-dimensional (3D) electrodynamic model is built using the finite-difference time-domain (FDTD) method to investigate the optical response of carbon nanotubes grafted with gold nanoparticles. Theoretical characterizations suggest an anisotropic response, in line with previously observed absorption peaks of such systems in the optical range. An investigation of geometric and wavelength dependences is conducted, predicting the ability to tune the sub-wavelength intensity enhancement for efficient localization and propagation. The support of electric field enhancement along the nanotube walls raises the possibility of utilizing such systems as plasmon generators and waveguides for optical signal propagation.
Bamboo-like carbon nanotubes produced by pyrolysis of iron(II) phthalocyanine
Publisher: Elsevier BV
Date: 08-2001
Structure and growth of aligned carbon nanotube films by pyrolysis
Publisher: Elsevier BV
Date: 2000
Low-temperature, controlled synthesis of carbon nanotubes
Publisher: Wiley
Date: 03-2005
Metal Charge Transfer Doped Carbon Dots with Reversibly Switchable, Ultra-High Quantum Yield Photoluminescence
Publisher: American Chemical Society (ACS)
Date: 05-04-2018
Large-Scale Synthesis of Perpendicularly Aligned Helical Carbon Nanotubes
Publisher: American Chemical Society (ACS)
Date: 30-03-2004
DOI: 10.1021/JA031738U
Abstract: Large-scale perpendicularly aligned helical carbon nanotube arrays were prepared by co-pyrolysis of Fe(CO)5 and pyridine onto the pristine quartz glass plates in a tube furnace at 900-1100 degrees C under a mixture flow of Ar and H2. The resultant aligned helical carbon nanotubes could not only facilitate the structure-property characterization for helical carbon nanotubes but also allow them to be effectively incorporated into devices for practical applications.
Metal-Free Catalysts for Oxygen Reduction Reaction
Publisher: American Chemical Society (ACS)
Date: 04-05-2015
DOI: 10.1021/CR5003563
Can Graphene Oxide Cause Damage to Eyesight?
Publisher: American Chemical Society (ACS)
Date: 25-05-2012
DOI: 10.1021/TX300129F
Abstract: As graphene becomes one of the most exciting candidates for multifunctional biomedical applications, contact between eyes and graphene-based materials is inevitable. On the other hand, eyes, as a special organ in the human body, have unique advantages to be used for testing new biomedical research and development, such as drug delivery. Intraocular biocompatible studies on graphene-related materials are thus essential. Here, we report our recent studies on intraocular biocompatibility and cytotoxicity of graphene oxide (GO) both in vitro and in vivo. The successful preparation of GO nanosheets was confirmed using atomic force microscopy, contact angle analyzer, Fourier transform infrared spectroscopy, and Raman spectroscopy. The influence of GO on human retinal pigment epithelium (RPE) cells in terms of the cell morphology, viability, membrane integrity, and apoptosis was investigated using various techniques, including optical micrography, cell counting kit-8 (CCK-8) assay, lactate dehydrogenase (LDH) assay, and apoptosis assay. The addition of GO had little influence on cell morphology, but the change was visible after long-time culturing. RPE cells showed higher than 60% cell viability by CCK-8 assay in GO solutions and less than 8% LDH release, although a small amount of apoptosis (1.5%) was observed. In vitro results suggested good biocompatibility of GO to RPE cells with slight adverse influence, on the cell viability and morphology in long-time periods, along with aggregation of GO. Thus, some further studies are needed to clarify the cytotoxicity mechanism of GO. GO intravitreally injected eyes showed few changes in eyeball appearance, intraocular pressure (IOP), eyesight, and histological photos. Our results suggested that GO did not cause any significant toxicity to the cell growth and proliferation. Intravitreal injection of GO into rabbits' eyes did not lead to much change in the eyeball appearance, IOP, electroretinogram, and histological examination.
Ten years of carbon‐based metal‐free electrocatalysts
Publisher: Wiley
Date: 09-2019
DOI: 10.1002/CEY2.5
Abstract: Since the discovery of the first carbon‐based metal‐free electrocatalysts (C‐MFECs, i.e., N‐doped carbon nanotubes) for the oxygen reduction reaction in 2009, the field of C‐MFECs has grown enormously over the last 10 years. C‐MFECs, as alternatives to nonprecious transition metals and/or precious noble metal‐based electrocatalysts, have been consistently demonstrated as efficient catalysts for oxygen reduction, oxygen evolution, hydrogen evolution, carbon dioxide reduction, nitrogen reduction, and many other (electro‐) chemical reactions. Recent research and development of C‐MFECs have indicated their potential applications in fuel cells, metal‐air batteries, and hydrogen generation through water oxidation as well as electrochemical production of various commodity chemicals, such as ammonia, alcohols, hydrogen peroxide, and other useful hydrocarbons. Further research and development of C‐MFECs would surely revolutionize traditional energy conversion and storage technologies with minimal environmental impact. In this short review article, we summarize the journey of C‐MFECs over the past 10 years with an emphasis on materials development and their structure‐property characterization for applications in fuel cells and metal‐air batteries. Current challenges and future prospects of this emerging field are also discussed.
Glucose sensors based on glucose-oxidase-containing polypyrrole/aligned carbon nanotube coaxial nanowire electrodes
Publisher: Elsevier BV
Date: 04-2003
Viscoelastic creep of vertically aligned carbon nanotubes
Publisher: IOP Publishing
Date: 16-07-2010
DOI: 10.1088/0022-3727/43/31/315401
Abstract: The paper reports the viscous creep occurring in vertically aligned carbon nanotubes (VA-CNTs). Nanoindentation experiments are conducted to characterize the creep behaviour of the nanotube materials. By recording the instantaneous control stress and strain rate, the creep strain rate sensitivity of the VA-CNT array is calculated. The creep property is found to depend upon the density of nanotube arrays.
Building 3D layer-by-layer graphene-gold nanoparticle hybrid architecture with tunable interlayer distance
Publisher: American Chemical Society (ACS)
Date: 07-07-2014
DOI: 10.1021/JP504553W
Conducting Polymers from Polybutadiene: Molecular Configuration Effects on the Iodine-Induced Conjugation Reactions
Publisher: American Chemical Society (ACS)
Date: 11-1994
DOI: 10.1021/MA00101A008
Carbon nanotube-based electrochemical biosensors
Publisher: CRC Press
Date: 19-12-2017
DOI: 10.1201/B16234
An asymmetrically surface-modified graphene film electrochemical actuator
Publisher: American Chemical Society (ACS)
Date: 09-09-2010
DOI: 10.1021/NN101563X
Abstract: It is critically important to develop actuator systems for erse needs ranging from robots and sensors to memory chips. The advancement of mechanical actuators depends on the development of new materials and rational structure design. In this study, we have developed a novel graphene electrochemical actuator based on a rationally designed monolithic graphene film with asymmetrically modified surfaces. Hexane and O(2) plasma treatment were applied to the opposite sides of graphene film to induce the asymmetrical surface properties and hence asymmetrical electrochemical responses, responsible for actuation behaviors. The newly designed graphene actuator demonstrated here opens a new way for actuator fabrication and shows the potential of graphene film for applications in various electromechanical systems.
Graphene‐Based Nanomaterials for Flexible and Wearable Supercapacitors
Publisher: Wiley
Date: 15-07-2018
Abstract: Along with the quick development of flexible and wearable electronic devices, there is an ever-growing demand for light-weight, flexible, and wearable power sources. Because of the high power density, excellent cycling stability and easy fabrication, flexible supercapacitors are widely studied for this purpose. Graphene-based nanomaterials are attractive electrode materials for flexible and wearable supercapacitors owing to their high surface area, good mechanical and electrical properties, and excellent electrochemical stability. The 2D structure and high aspect ratio of graphene nanosheets make them easy to assemble into films or fibers with good mechanical properties. In recent years, enormous progress has been made in developing flexible and wearable graphene-based supercapacitors. Here, the material and structure design strategies for developing film-shaped and emerging fiber-shaped flexible supercapacitors based on graphene nanomaterials are summarized.
Nitrogen-doped graphene by ball-milling graphite with melamine for energy conversion and storage
Publisher: IOP Publishing
Date: 12-10-2015
Graphene oxide complex as a pH-sensitive antitumor drug
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5PY00047E
Abstract: A chitosan-xanthone-GO nanocomposite as a pH-sensitive nanocarrier for controlled release of the antitumor drug.
Differential biocompatibility of carbon nanotubes and nanodiamonds
Publisher: Elsevier BV
Date: 12-2007
Large-Area Graphene Films by Simple Solution Casting of Edge-Selectively Functionalized Graphite
Publisher: American Chemical Society (ACS)
Date: 24-05-2011
DOI: 10.1021/NN201072M
Abstract: We report edge-selective functionalization of graphite (EFG) for the production of large-area uniform graphene films by simply solution-casting EFG dispersions in dichloromethane on silicon oxide substrates, followed by annealing. The resultant graphene films show ambipolar transport properties with sheet resistances of 0.52-3.11 kΩ/sq at 63-90% optical transmittance. EFG allows solution processing methods for the scalable production of electrically conductive, optically transparent, and mechanically robust flexible graphene films for use in practice.
Carbons for wearable devices - Commentary and introduction to the virtual special issue
Publisher: Elsevier BV
Date: 2018
Novel quinoxaline-based organic sensitizers for dye-sensitized solar cells
Publisher: American Chemical Society (ACS)
Date: 27-06-2011
DOI: 10.1021/OL2012378
Abstract: Novel quinoxaline-based organic sensitizers using vertical (RC-21) and horizontal (RC-22) conjugation between an electron-donating triphenylamine unit and electron-accepting quinoxaline unit have been synthesized and used for dye-sensitized solar cells (DSSCs), leading to the relatively high power conversion efficiencies of 3.30 and 5.56% for RC-21 and RC-22, respectively. This result indicates that the quinoxaline electron-accepting unit is quite a promising candidate in organic sensitizers.
Mechanical characterization device for in situ measurement of nanomechanical properties of micro/nanostructures
Publisher: AIP Publishing
Date: 14-08-2006
DOI: 10.1063/1.2271576
Abstract: A characterization device was developed for nanomechanical testing on one-dimensional micro/nanostructures. The tool consists of a nanomanipulator, a three-plate capacitive transducer, and associated probes, and is operated inside a scanning electron microscope. The transducer independently measures force and displacement with micronewton and nanometer sale resolutions, respectively. Tensile testing of a polyaniline microfiber (diameter ∼1μm) demonstrated the capabilities of the system. Engineering stress versus strain curves exhibited two distinct regions with different Young’s moduli. Failure at the probe-s le weld occurred at ∼67MPa, suggesting that polyaniline microfibers exhibit a yield stress that is higher than most comparable bulk polymers.
Self-assembled graphene/carbon nanotube hybrid films for supercapacitors
Publisher: American Chemical Society (ACS)
Date: 22-12-2010
DOI: 10.1021/JZ9003137
Functionalized carbon nanotubes and graphene-based materials for energy storage
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CC05581H
Abstract: This feature article summarizes recent progress in the functionalization of carbon nanotubes and graphene for energy storage applications in supercapacitors and batteries.
Edge-Selectively Sulfurized Graphene Nanoplatelets as Efficient Metal-Free Electrocatalysts for Oxygen Reduction Reaction: The Electron Spin Effect
Publisher: Wiley
Date: 23-08-2013
Abstract: To replace precious platinum (Pt)-based electrocatalysts for cathodic oxygen reduction reaction (ORR), edge-selectively sulfurized graphene nanoplatelets (SGnP) are synthesized as efficient metal-free electrocatalysts simply by ball-milling pristine graphite in the presence of sulfur (S8 ). The resultant SGnPs exhibit remarkable electrocatalytic activity toward ORR with better tolerance to methanol crossover/CO poisoning effects and longer-term stability than those of pristine graphite and commercial Pt/C electrocatalysts. Edge-Selectively Sulfurized Graphene Nanoplatelets as Efficient Metal-Free Electrocatalysts for Oxygen Reduction Reaction: The Electron Spin Effect.
Proton Capture Strategy for Enhancing Electrochemical CO2 Reduction on Atomically Dispersed Metal–Nitrogen Active Sites**
Publisher: Wiley
Date: 12-04-2021
Abstract: Electrocatalysts play a key role in accelerating the sluggish electrochemical CO 2 reduction (ECR) involving multi‐electron and proton transfer. We now develop a proton capture strategy by accelerating the water dissociation reaction catalyzed by transition‐metal nanoparticles (NPs) adjacent to atomically dispersed and nitrogen‐coordinated single nickel (Ni−N x ) active sites to accelerate proton transfer to the latter for boosting the intermediate protonation step, and thus the whole ECR process. Aberration‐corrected scanning transmission electron microscopy, X‐ray absorption spectroscopy, and calculations reveal that the Ni NPs accelerate the adsorbed H (H ad ) generation and transfer to the adjacent Ni−N x sites for boosting the intermediate protonation and the overall ECR processes. This proton capture strategy is universal to design and prepare for various high‐performance catalysts for erse electrochemical reactions even beyond ECR.
Fast Diffusion of O2 on Nitrogen-Doped Graphene to Enhance Oxygen Reduction and Its Application for High-Rate Zn-Air Batteries
Publisher: American Chemical Society (ACS)
Date: 15-02-2017
Abstract: N-doped graphene (NDG) was investigated for oxygen reduction reaction (ORR) and used as air-electrode catalyst for Zn-air batteries. Electrochemical results revealed a slightly lower kinetic activity but a much larger rate capability for the NDG than commercial 20% Pt/C catalyst. The maximum power density for a Zn-air cell with NDG air cathode reached up to 218 mW cm
Carbon Nanomaterials for Energy and Biorelated Catalysis: Recent Advances and Looking Forward
Publisher: American Chemical Society (ACS)
Date: 08-02-2019
Carbon nanotubols from mechanochemical reaction
Publisher: American Chemical Society (ACS)
Date: 27-11-2003
DOI: 10.1021/NL025856B
C60-Adsorbed Single-Walled Carbon Nanotubes as Metal-Free, pH-Universal, and Multifunctional Catalysts for Oxygen Reduction, Oxygen Evolution, and Hydrogen Evolution
Publisher: American Chemical Society (ACS)
Date: 26-06-2019
DOI: 10.1021/JACS.9B05006
Abstract: Buckminsterfullerene (C
Controlled growth and modification of vertically-aligned carbon nanotubes for multifunctional applications
Publisher: Elsevier BV
Date: 11-2010
Correction: The importance of hydration and DNA conformation in interpreting infrared spectra of cells and tissues
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5CS90121A
Abstract: Correction for ‘The importance of hydration and DNA conformation in interpreting infrared spectra of cells and tissues’ by Bayden R. Wood et al. , Chem. Soc. Rev. , 2015, DOI: 10.1039/c5cs00511f.
Hydrophobic, Ultrastable Cuδ+ for Robust CO2 Electroreduction to C2 Products at Ampere-Current Levels
Publisher: American Chemical Society (ACS)
Date: 11-05-2023
DOI: 10.1021/JACS.3C02399
Scalable Fabrication of Nanoporous Carbon Fiber Films as Bifunctional Catalytic Electrodes for Flexible Zn‐Air Batteries
Publisher: Wiley
Date: 23-02-2016
Abstract: A flexible nanoporous carbon-fiber film for wearable electronics is prepared by a facile and scalable method through pyrolysis of electrospun polyimide. It exhibits excellent bifunctional electrocatalytic activities for oxygen reduction and oxygen evolution. Flexible rechargeable zinc-air batteries based on the carbon-fiber film show high round-trip efficiency and mechanical stability.
Conducting polymer and polymer/CNT composite nanofibers by electrospinning
Publisher: American Chemical Society
Date: 11-12-2009
Carbon-Based Metal-Free Catalysts for Key Reactions Involved in Energy Conversion and Storage
Publisher: Wiley
Date: 20-11-2018
Abstract: Electrocatalysts are key for renewable energy technologies and other important industrial processes. Currently, noble metals and metal oxides are the most widely used catalysts for electrocatalysis. However, metal-based catalysts often suffer from multiple disadvantages, including high cost, low selectivity, poor durability, impurity poisoning and fuel crossover effects, and detrimental effects on the environment. Therefore, carbon-based metal-free catalysts have received increasing interest as promising electrocatalysts for advanced energy conversion and storage. Recently, tremendous progress has been achieved in the development of low-cost, efficient carbon-based metal-free catalysts for renewable energy technologies and beyond. Here, a concise, but comprehensive and critical, review of recent advances in the field of carbon-based metal-free catalysts is provided. A brief overview of various reactions involved in renewable energy conversion and storage, including the oxygen reduction reaction, hydrogen evolution reaction, oxygen evolution reaction, carbon dioxide reduction reaction, nitrogen reduction reaction, and bifunctional/multifunctional electrocatalysis, along with some challenges and opportunities, is presented.
Multifunctional carbon-based metal-free catalysts for advanced energy conversion and storage
Publisher: Elsevier BV
Date: 02-2021
Re-shaping graphene hydrogels for effectively enhancing actuation responses
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR02604K
Abstract: The development of actuation-enabled materials is important for smart devices and systems. Among them, graphene with outstanding electric, thermal, and mechanical properties holds great promise as a new type of stimuli-responsive material. In this study, we developed a re-shaping strategy to construct structure-controlled graphene hydrogels for highly enhanced actuation responses. Actuators based on the re-shaped graphene hydrogel showed a much higher actuation response than that of the common graphene counterparts. On the other hand, once composited with a conducting polymer (e.g., polypyrrole), the re-shaped hybrid actuator exhibits excellent actuation behavior in response to electrochemical potential variation. Even under stimulation at a voltage as low as 0.8 V, actuators based on the re-shaped graphene-polypyrrole composite hydrogel exhibit a maximum strain response of up to 13.5%, which is the highest value reported to date for graphene-based materials.
Three-Dimensional Micropatterns of Well-Aligned Carbon Nanotubes Produced by Photolithography
Publisher: American Scientific Publishers
Date: 03-2001
DOI: 10.1166/JNN.2001.003
Abstract: Three-dimensional micropatterns of well-aligned carbon nanotubes were prepared on photolithographically prepatterned substrates by pyrolysis of iron(II) phthalocyanine (FePc) under an Ar/H2 atmosphere at 800-1100 degrees C. The photopatterning was achieved by photolithographic cross-linking of a chemically lified photoresist layer spin-cast on a quartz plate or a silicon wafer, coupled with solution development. Owing to an appropriate surface characteristic, the patterned photoresist layer was found in this case to support aligned carbon nanotube growth by pyrolysis of FePc, as were the photoresist-free substrate surfaces. The difference in chemical nature between the surface areas covered and uncovered by the photoresist film, however, caused a region-specific growth of the nanotubes with different tubular lengths and packing densities, leading to the formation of three-dimensional aligned nanotube patterns suitable for various device applications.
Can graphene quantum dots cause DNA damage in cells?
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR01734C
Abstract: Graphene quantum dots (GQDs) have attracted tremendous attention for biological applications. We report the first study on cytotoxicity and genotoxicity of GQDs to fibroblast cell lines (NIH-3T3 cells). The NIH-3T3 cells treated with GQDs at dosages over 50 μg mL(-1) showed no significant cytotoxicity. However, the GQD-treated NIH-3T3 cells exhibited an increased expression of proteins (p53, Rad 51, and OGG1) related to DNA damage compared with untreated cells, indicating the DNA damage caused by GQDs. The GQD-induced release of reactive oxygen species (ROS) was demonstrated to be responsible for the observed DNA damage. These findings should have important implications for future applications of GQDs in biological systems.
Hexakisaddu ct C60 -Ag nanocomposite: Fabrication and optical limiting effect
Publisher: Elsevier BV
Date: 04-2002
Aggregation-Induced Emission for Highly Selective and Sensitive Fluorescent Biosensing and Cell Imaging
Publisher: Wiley
Date: 04-01-2017
DOI: 10.1002/POLA.28447
Highly crystalline and low bandgap donor polymers for efficient polymer solar cells
Publisher: Wiley
Date: 23-12-2012
Abstract: A highly crystalline and low bandgap donor polymer, EI-PFDTBT, is developed by inserting ethylene bridging units to ensure a coplanar configuration between the side chains and the main chain. Polymer solar cells based on the EI-PFDTBT and PC(71) BM blends spincoated at elevated temperatures exhibit a power conversion efficiency of 5.1%.
Graphene-based materials for energy applications
Publisher: Springer Science and Business Media LLC
Date: 23-11-2012
DOI: 10.1557/MRS.2012.179
Carbon nanotube rubber stays rubbery in extreme temperatures
Publisher: Wiley
Date: 19-04-2011
Semiconductive properties of DNA-based materials
Publisher: SPIE
Date: 02-10-2008
DOI: 10.1117/12.801700
Carbon Nanotechnology
Publisher: Elsevier
Date: 2006
Robust self-cleaning and micromanipulation capabilities of gecko spatulae and their bio-mimics
Publisher: Springer Science and Business Media LLC
Date: 20-11-2015
DOI: 10.1038/NCOMMS9949
Cytotoxicity and genotoxicity of multi-walled carbon nanotubes with human ocular cells
Publisher: Springer Science and Business Media LLC
Date: 27-04-2013
Carbon microfibers sheathed with aligned carbon nanotubes: Towards multidimensional, multicomponent, and multifunctional nanomaterials
Publisher: Wiley
Date: 28-07-2006
Abstract: Multicomponent and multifunctional hybrid structures based on microsized carbon fibers sheathed with aligned carbon nanotubes and their derivatives have been successfully prepared, and have been demonstrated to be an effective means for connecting nanoscale entities to the outside world and to possess interesting electrochemical properties attractive for a wide range of potential applications, including in methanol direct fuel cells and highly sensitive biological and chemical sensors. Judicious modification of the carbon‐fiber‐supported aligned carbon nanotubes with various functional moieties could lead to a class of novel multidimensional, multicomponent, and multifunctional materials of practical significance.
Multiscale patterning of graphene oxide and reduced graphene oxide for flexible supercapacitors
Publisher: Elsevier BV
Date: 10-2015
Population prevalence of Helicobacter pylori as impacted by socio-economic status in a regional and rural area
Publisher: Elsevier BV
Date: 02-2023
A general approach to cobalt-based homobimetallic phosphide ultrathin nanosheets for highly efficient oxygen evolution in alkaline media
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6EE03145E
Abstract: A general and effective approach was proposed to fabricate a new family of Co-based bimetallic phosphide ultrathin nanosheets for highly-efficient oxygen evolution.
Hierarchical composites of carbon nanotubes on carbon fiber: Influence of growth condition on fiber tensile properties
Publisher: Elsevier BV
Date: 04-2009
Fe/Co dual metal catalysts modulated by S-ligands for efficient acidic oxygen reduction in PEMFC
Publisher: American Association for the Advancement of Science (AAAS)
Date: 09-06-2023
Abstract: Here, we report a conceptual strategy for introducing spatial sulfur (S)–bridge ligands to regulate the coordination environment of Fe-Co-N dual-metal centers (Spa-S-Fe,Co/NC). Benefiting from the electronic modulation, Spa-S-Fe,Co/NC catalyst showed remarkably enhanced oxygen reduction reaction (ORR) performance with a half-wave potential ( E 1/2 ) of 0.846 V and satisfactory long-term durability in acidic electrolyte. Combined experimental and theoretical studies revealed that the excellent acidic ORR activity with a remarkable stability observed for Spa-S-Fe,Co/NC is attributable to the optimal adsorption-desorption of ORR oxygenated intermediates achieved through charge-modulation of Fe-Co-N bimetallic centers by the spatial S-bridge ligands. These findings provide a unique perspective to regulate the local coordination environment of catalysts with dual-metal-centers to optimize their electrocatalytic performance.
Enhancement of through-Thickness Thermal Conductivity in Adhesively Bonded Joints Using Aligned Carbon Nanotubes
Publisher: Wiley
Date: 08-2011
Age group preference of non-invasive Helicobacter pylori detection methods
Publisher: Elsevier BV
Date: 02-2023
Comparison Study of Phenylquinoline-based Iridium(III) Complexes for Solution Processable Phosphorescent Organic Light-Emitting Diodes by PEDOT:PSS and Graphene Oxide as a Hole Transport Layer
Publisher: Informa UK Limited
Date: 02-11-2015
Functionalized graphene nanoplatelets from ball milling for energy applications
Publisher: Elsevier BV
Date: 02-2016
The Chemistry of Energy Conversion and Storage
Publisher: Wiley
Date: 09-04-2016
Abstract: Extra energy required: One of the most critical issues facing society today is energy - where do we get it from, how do we use it, how do we store it, how can we save it. Chemists play a decisive role in facing these challenges to secure a ready supply of energy for generations to come. To highlight the importance of this topic and the contributions that chemists around the world make, this special issue is dedicated to energy conversion and storage. Graphic designed by Freepik. ree-vector/ batteries_800894.htm.
A turn-on fluorescent lysine nanoprobe based on the use of the Alizarin Red aluminum(III) complex conjugated to graphene oxide, and its application to cellular imaging of lysine
Publisher: Springer Science and Business Media LLC
Date: 24-06-2017
Flexible fiber-shaped non-enzymatic sensors with a graphene-metal heterostructure based on graphene fibres decorated with gold nanosheets
Publisher: Elsevier BV
Date: 09-2018
Microporous N,P-Codoped Graphitic Nanosheets as an Efficient Electrocatalyst for Oxygen Reduction in Whole pH Range for Energy Conversion and Biosensing Dissolved Oxygen
Publisher: Wiley
Date: 07-08-2018
Abstract: Microporous N,P-codoped graphitic nanosheets (N,P-CMP-1000) were synthesized by thermal annealing (1000 °C) of as-synthesized conjugated microporous polymers (CMPs) in the presence of phytic acid, which can be used as an effective metal-free electrocatalyst for the oxygen reduction reaction (ORR) for energy conversion. In the whole pH range (i.e. alkaline, acidic, and neutral solutions), the obtained N,P-CMP-1000 exhibits superior electrocatalytic activity for ORR with a low overpotential, high current density, and good stability. Furthermore, N,P-CMP-1000 can also be applied for electrochemically sensing dissolved oxygen (DO), with a high sensitivity (1.89 μA mg
Boosting Electroreduction Kinetics of Nitrogen to Ammonia via Tuning Electron Distribution of Single‐Atomic Iron Sites
Publisher: Wiley
Date: 05-03-2021
Are diamond nanoparticles cytotoxic?
Publisher: American Chemical Society (ACS)
Date: 14-12-2007
DOI: 10.1021/JP066387V
Abstract: Finely ided carbon particles, including charcoal, l black, and diamond particles, have been used for ornamental and official tattoos since ancient times. With the recent development in nanoscience and nanotechnology, carbon-based nanomaterials (e.g., fullerenes, nanotubes, nanodiamonds) attract a great deal of interest. Owing to their low chemical reactivity and unique physical properties, nanodiamonds could be useful in a variety of biological applications such as carriers for drugs, genes, or proteins novel imaging techniques coatings for implantable materials and biosensors and biomedical nanorobots. Therefore, it is essential to ascertain the possible hazards of nanodiamonds to humans and other biological systems. We have, for the first time, assessed the cytotoxicity of nanodiamonds ranging in size from 2 to 10 nm. Assays of cell viability such as mitochondrial function (MTT) and luminescent ATP production showed that nanodiamonds were not toxic to a variety of cell types. Furthermore, nanodiamonds did not produce significant reactive oxygen species. Cells can grow on nanodiamond-coated substrates without morphological changes compared to controls. These results suggest that nanodiamonds could be ideal for many biological applications in a erse range of cell types.
Graphene networks for high-performance flexible and transparent supercapacitors
Publisher: Royal Society of Chemistry (RSC)
Date: 30-07-2014
DOI: 10.1039/C4RA05076B
Reduced Graphene Oxide Membranes for Ultrafast Organic Solvent Nanofiltration
Publisher: Wiley
Date: 12-08-2016
Abstract: Solvated reduced graphene oxide (S-rGO) membranes are stable in organic solvents, and strong acidic, alkaline, or oxidative media. They show high rejections to small molecules with charges the same as that of S-rGO coatings or neutral molecules larger than 3.4 nm, while retaining their high permeances to organic solvents.
Platinized aligned carbon nanotube-sheathed carbon fiber microelectrodes for in vivo amperometric monitoring of oxygen
Publisher: American Chemical Society (ACS)
Date: 07-05-2014
DOI: 10.1021/AC500622M
Abstract: The abnormal level of O2 could disturb various neurochemical processes and even induce neural injury and brain dysfunction. In order to assess critical roles of O2 in the neurochemical processes, it is essential to perform in vivo monitoring of the dynamic changes of O2. In this study, we develop a new electrochemical method for selectively monitoring O2 in vivo, using platinized vertically aligned carbon nanotube (VACNT)-sheathed carbon fibers (Pt/VACNT-CFs) as the electrodes. The VACNT-sheathed CFs (VACNT-CFs) are produced via the pyrolysis of iron phthalocyanine (FePc) on the surface of CFs, followed by electrochemical deposition of platinum nanoparticles to form Pt/VACNT-CFs. The resulting Pt/VACNT-CF microelectrodes exhibit fast overall kinetics for the O2 reduction via a four-electron reduction process without the formation of toxic H2O2 intermediate. Consequently, effective and selective electrochemical methods are developed for the measurements of O2 in rat brain with the Pt/VACNT-CF microelectrodes, even in the presence of some species at their physiological levels, such as ascorbic acid, dopamine, uric acid, 5-hydroxytryptamine, and of the O2 fluctuation in rat brain in the early stage of global cerebral ischemia/reperfusion, mild hyperoxia, and hypoxia induced by exposing the animal, for a short time, to O2 and N2, respectively, and hindfeet pinch. The use of VACNT-CF as the support for Pt effectively improves the stability of Pt, as compared with the bare CF support, while the FePc pyrolysis ensures the VACNT-CFs to be reproducibly produced. Thus, this study offers a novel and reliable strategy for preparing new microelectrodes for in vivo monitoring of O2 in various physiological processes with a high sensitivity and selectivity.
Polyaniline-Grafted Reduced Graphene Oxide for Efficient Electrochemical Supercapacitors
Publisher: American Chemical Society (ACS)
Date: 03-02-2012
DOI: 10.1021/NN204688C
Abstract: An alternative and effective route to prepare conducting polyaniline-grafted reduced graphene oxide (PANi-g-rGO) composite with highly enhanced properties is reported. In order to prepare PANi-g-rGO, amine-protected 4-aminophenol was initially grafted to graphite oxide (GO) via acyl chemistry where a concomitant partial reduction of GO occurred due to the refluxing and exposure of GO to thionyl chloride vapors and heating. Following the deprotection of amine groups, an in situ chemical oxidative grafting of aniline in the presence of an oxidizing agent was carried out to yield highly conducting PANi-g-rGO. Electron microscopic studies demonstrated that the resultant composite has fibrillar morphology with a room-temperature electrical conductivity as high as 8.66 S/cm and capacitance of 250 F/g with good cycling stability.
Functionalization of graphene materials by heteroatom-doping for energy conversion and storage
Publisher: Elsevier BV
Date: 04-2018
Novel secondary dopants for camphorsulfonic acid doped polyaniline emeraldine salts
Publisher: CSIRO Publishing
Date: 2002
DOI: 10.1071/CH02001
Abstract: The doping of emeraldine base with (±)-10-c horsulfonic acid (HCSA) or (+)-HCSA in molten thymol (60°C) or liquid carvacrol (5-isopropyl-2-methylphenol) as solvents provides emeraldine polyaniline (PAn)�HCSA salts (1) with 'expanded coil'-type conformations for their polyaniline chains. Conversion of both racemic PAn�(±)-HCSA (1a) and optically active PAn�(+)-HCSA (1b) films from a 'compact coil' into a partial 'expanded coil' conformation is also facilitated by exposure of the films to either thymol or carvacrol vapours. These conformational changes are supported by modifications to their ultraviolet-visible-near-infrared and circular dichroism spectra and by the marked increase in the electrical conductivity of the films. In the case of carvacrol vapour, treated films of (1a) and (1b) exhibited conductivities of ≥ 130 S/cm, similar to conductivities previously generated by m-cresol. In view of the much lower toxicity of carvacrol compared with m-cresol, it would appear to have considerable promise as an effective 'secondary dopant' for emeraldine salts leading to materials with enhanced electrical conductivity.
Optical Turn-On Sensor Based on Graphene Oxide for Selective Detection of d -Glucosamine
Publisher: American Chemical Society (ACS)
Date: 12-06-2012
DOI: 10.1021/AC300784P
Abstract: By incorporating the well-known fluorophore 8-aminoquinoline into graphene oxide, we have successfully prepared a turn-on fluorescent sensor capable of specific detection of D-glucosamine with a high selectivity and sensitivity. This methodology provides a new concept for the design and development of highly selective and sensitive turn-on optical sensors for selective detection of aminosaccharides and many other biomolecules.
A rechargeable iodine-carbon battery that exploits ion intercalation and iodine redox chemistry
Publisher: Springer Science and Business Media LLC
Date: 13-09-2017
DOI: 10.1038/S41467-017-00649-7
Abstract: Graphitic carbons have been used as conductive supports for developing rechargeable batteries. However, the classic ion intercalation in graphitic carbon has yet to be coupled with extrinsic redox reactions to develop rechargeable batteries. Herein, we demonstrate the preparation of a free-standing, flexible nitrogen and phosphorus co-doped hierarchically porous graphitic carbon for iodine loading by pyrolysis of polyaniline coated cellulose wiper. We find that heteroatoms could provide additional defect sites for encapsulating iodine while the porous carbon skeleton facilitates redox reactions of iodine and ion intercalation. The combination of ion intercalation with redox reactions of iodine allows for developing rechargeable iodine–carbon batteries free from the unsafe lithium/sodium metals, and hence eliminates the long-standing safety issue. The unique architecture of the hierarchically porous graphitic carbon with heteroatom doping not only provides suitable spaces for both iodine encapsulation and cation intercalation but also generates efficient electronic and ionic transport pathways, thus leading to enhanced performance.
Novel silver nanostructures from silver mirror reaction on reactive substrates
Publisher: American Chemical Society (ACS)
Date: 30-06-2005
DOI: 10.1021/JP0515838
Abstract: Novel silver clusters have been prepared by simply carrying out the silver mirror reaction on certain reactive substrates. Leaflike fractal silver microstructures and perpendicularly aligned silver nanosheets were produced on a commercially available copper foil and sandpaper-rubbed copper foil, respectively. The surface features of copper foils and the chemical state of Cu atoms play important roles in regulating the morphological structures of the resulting silver clusters. Silver nanoclusters with various morphologies ranging from the leaflike to flowerlike hierarchical structures can be produced from the silver mirror reaction on commercially available copper foils after being treated with a dilute aqueous HCl solution under different conditions. The aqueous solution of silver nanosheets shows an optical absorption spectrum with a broad light-scattering peak at about 350 nm, compared to a corresponding surface plasmon absorption band around 430 nm for silver nanoparticles from the conventional silver mirror reaction on glass.
Ternary Pd2 /PtFe networks supported by 3D graphene for efficient and durable electrooxidation of formic acid
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CC37413G
Abstract: A newly-designed network of ternary Pd(2)/PtFe nanowires on a three-dimensional graphene framework has been fabricated via a dual solvothermal approach, which presents superior electrocatalytic activity towards the oxidation of formic acid.
Nitrogen-Doped Holey Graphene for High-Performance Rechargeable Li-O2 Batteries
Publisher: American Chemical Society (ACS)
Date: 16-06-2016
Cathode materials for next generation lithium ion batteries
Publisher: Elsevier BV
Date: 07-2013
Aligned carbon nanotubes for multifunctional nanocomposites and nanodevices: From plastic optoelectronics to bioceramics
Publisher: Informa UK Limited
Date: 08-2008
Hydrophilic cucurbit[7]uril-pseudorotaxane-anchored-monolayer-protected gold nanorods
Publisher: Wiley
Date: 20-03-2013
Graphene oxide-based carbon interconnecting layer for polymer tandem solar cells
Publisher: American Chemical Society (ACS)
Date: 17-02-2014
DOI: 10.1021/NL4046284
Abstract: Tandem polymer solar cells (PSCs), consisting of more than one (normally two) subcells connected by a charge recombination layer (i.e., interconnecting layer), hold great promise for enhancing the performance of PSCs. For an ideal tandem solar cell, the open circuit voltage (Voc) equals to the sum of those of the subcells while keeping the short circuit current the same as the lower one, leading to an increased overall power conversion efficiency. The interconnecting layer plays an important role in regulating the tandem device performance. Here, we report that graphene oxide (GO)/GO-Cs (cesium neutralized GO) bilayer modified with ultrathin Al and MoO3 can act as an efficient interconnecting layer in tandem PSCs to achieve a significantly increased Voc, reaching almost 100% of the sum of the subcell V(oc)s under standard AM 1.5 conditions.
Surface passivation for highly active, selective, stable, and scalable CO2 electroreduction
Publisher: Springer Science and Business Media LLC
Date: 03-08-2023
DOI: 10.1038/S41467-023-40342-6
Abstract: Electrochemical conversion of CO 2 to formic acid using Bismuth catalysts is one the most promising pathways for industrialization. However, it is still difficult to achieve high formic acid production at wide voltage intervals and industrial current densities because the Bi catalysts are often poisoned by oxygenated species. Herein, we report a Bi 3 S 2 nanowire-ascorbic acid hybrid catalyst that simultaneously improves formic acid selectivity, activity, and stability at high applied voltages. Specifically, a more than 95% faraday efficiency was achieved for the formate formation over a wide potential range above 1.0 V and at ere-level current densities. The observed excellent catalytic performance was attributable to a unique reconstruction mechanism to form more defective sites while the ascorbic acid layer further stabilized the defective sites by trapping the poisoning hydroxyl groups. When used in an all-solid-state reactor system, the newly developed catalyst achieved efficient production of pure formic acid over 120 hours at 50 mA cm –2 (200 mA cell current).
DNA damage induced by multiwalled carbon nanotubes in mouse embryonic stem cells
Publisher: American Chemical Society (ACS)
Date: 29-11-2007
DOI: 10.1021/NL071303V
Abstract: Carbon nanotubes (CNTs) have shown promise as an important new class of multifunctional building blocks and innovative tools in a large variety of applications, ranging from nanocomposite materials through nanoelectronics to biomedical devices. Because of their unusual one-dimensional hollow nanostructure and unique physicochemical properties, CNTs are particularly useful as novel drug delivery tools and imaging agents. However, such biomedical applications will not be realized if there is no proper assessment of the potential hazards of CNTs to humans and other biological systems. Although a few reports on the cytotoxicity of CNTs have been published, very little is known about the toxicity at the molecular level, or genotoxicity, of CNTs in mammalian cells. We have for the first time assessed the DNA damage response to multiwalled carbon nanotubes (MWNTs) in mouse embryonic stem (ES) cells. We found that MWNTs can accumulate and induce apoptosis in mouse ES cells and activate the tumor suppressor protein p53 within 2 h of exposure. Furthermore, we also observed increased expression of two isoforms of base excision repair protein 8-oxoguanine-DNA glycosylase 1 (OGG1), double strand break repair protein Rad 51, phosphorylation of H2AX histone at serine 139, and SUMO modification of XRCC4 following the treatment with MWNTs. A mutagenesis study using an endogenous molecular marker, adenine phosphoribosyltransferase (Aprt), showed that MWNTs increased the mutation frequency by 2-fold compared with the spontaneous mutation frequency in mouse ES cells. These results suggest that careful scrutiny of the genotoxicity of nanomaterials is needed even for those materials, like multiwalled carbon nanotubes, that have been previously demonstrated to have limited or no toxicity at the cellular level.
Synthesis of thiol surfactant with tunable length as a stabilizer of gold nanoparticles
Publisher: American Chemical Society
Date: 19-09-2008
Electrochemistry at Carbon Nanotube Electrodes: Is the Nanotube Tip More Active Than the Sidewall?
Publisher: Wiley
Date: 07-07-2008
Facile route to fullerol-containing polymers
Publisher: Elsevier BV
Date: 02-1997
Conducting polymers, buckminsterfullerenes, and carbon nanotubes: Optoelectronic materials based on architectural diversity of the π-conjugated structure
Publisher: CSIRO Publishing
Date: 2001
DOI: 10.1071/CH01041
Surface activity of polyacetylene-polyisoprene solutions
Publisher: Elsevier BV
Date: 02-1989
Chemistry of carbon nanotubes
Publisher: CSIRO Publishing
Date: 2003
DOI: 10.1071/CH02254
Abstract: Judicious application of site-selective reactions to non-aligned and aligned carbon nanotubes has opened a rich field of carbon nanotube chemistry. In order to meet specific requirements demanded by particular applications (e.g. biocompatibility for nanotube biosensors and interfacial strength for blending with polymers), chemical modification of carbon nanotubes is essential. The tips of carbon nanotubes are more reactive than their sidewalls, allowing a variety of chemical reagents to be attached at the nanotube tips. Recently, some interesting reactions have also been devised for chemical modification of both the inner and outer nanotube walls, though the seamless arrangement of hexagon rings renders the sidewalls relatively unreactive. This review provides a brief summary of very recent progress in the research on chemistry of carbon nanotubes.
2D Frameworks of C2 N and C3 N as New Anode Materials for Lithium-Ion Batteries
Publisher: Wiley
Date: 10-07-2017
Abstract: Novel layered 2D frameworks (C 3 N and C 2 N‐450) with well‐defined crystal structures are explored for use as anode materials in lithium‐ion batteries (LIBs) for the first time. As anode materials for LIBs, C 3 N and C 2 N‐450 exhibit unusual electrochemical characteristics. For ex le, C 2 N‐450 (and C 3 N) display high reversible capacities of 933.2 (383.3) and 40.1 (179.5) mAh g −1 at 0.1 and 10 C, respectively. Furthermore, C 3 N shows a low hypothetical voltage (≈0.15 V), efficient operating voltage window with ≈85% of full discharge capacity secured at .45 V, and excellent cycling stability for more than 500 cycles. The excellent electrochemical performance (especially of C 3 N) can be attributed to their inherent 2D polyaniline frameworks, which provide large net positive charge densities, excellent structural stability, and enhanced electronic/ionic conductivity. Stable solid state interface films also form on the surfaces of the 2D materials during the charge/discharge process. These 2D materials with promising electrochemical performance should provide insights to guide the design and development of their analogues for future energy applications.
Nanodiamonds for nanomedicine
Publisher: Future Medicine Ltd
Date: 02-2009
Abstract: Recent studies on carbon nanomaterials for biological applications revealed that carbon nanodiamonds are much more biocompatible than most other carbon nanomaterials, including carbon blacks, fullerenes and carbon nanotubes. The noncytotoxic nature of nanodiamonds, together with their unique strong and stable photoluminescence, tiny size, large specific surface area and ease with which they can be functionalized with biomolecules, makes nanodiamonds attractive for various biomedical applications both in vitro and in vivo. In this article, we present some of the important issues concerning the synthesis and surface functionalization of diamond nanoparticles for nanomedicine as well as an overview of the recent progress in this exciting field by focusing on the potential use of nanodiamonds and their derivatives for single particle imaging in cells, drug delivery, protein separation and biosensing.
Multicomponent and multidimensional carbon nanotube micropatterns by dry contact transfer
Publisher: American Scientific Publishers
Date: 04-2007
DOI: 10.1166/JNN.2007.341
Abstract: One of the critical aspects of nanotechnology is to assemble different nanoscale components into a single system. In such a multicomponent system, the overall functionality depends strongly on the precise location and structural characteristics of each of the constituent components. In this context, we have prepared multicomponent micropatterns of silica particles interposed within the discrete areas of aligned multiwall carbon nanotubes. The patterns were fabricated by dry contact transferring aligned carbon nanotubes onto a tape pre-patterned with a thin layer of gold structure, followed by region-specific adsorption of thiol-modified silica particles onto the gold surface from solution. The dry contact transfer technique has further enabled us to develop micropatterns of aligned single-wall carbon nanotubes with interdispersed non-aligned multiwall carbon nanotubes and microsized carbon fibers sheathed with micropatterned aligned carbon nanotubes.
C60 and carbon nanotube sensors
Publisher: Elsevier
Date: 2006
Biomolecule-doped PEDOT with three-dimensional nanostructures as efficient catalyst for oxygen reduction reaction
Publisher: Wiley
Date: 02-03-2014
Abstract: Metal macro-cyclic compounds have drawn considerable attention as alternative catalysts for oxygen reduction reaction. However, the continuous pyrolysis process usually needed for improving the performance of these compounds require an elevated temperature and complicated procedures, thus leading to an unpredictable transformation of the chemical structures and limiting their applications. Herein, we develop a new insight to fabricating hemin-doped poly (3,4-ethylenedioxythiophene) (PEDOT) with controllable three-dimensional nanostructures via a one-step, tri-phase, self-assembled polymerization routine. We demonstrate that the hemin-induced synergistic effect results in a very high 4-electron oxygen reduction activity, a better stability, and free from methanol crossover effects even in a neutral phosphate buffer solution (PBS).
N-doped porous carbon nanosheets as pH-universal ORR electrocatalyst in various fuel cell devices
Publisher: Elsevier BV
Date: 07-2018
Perylene Monolayer Protected Gold Nanorods: Unique Optical, Electronic Properties and Self-Assemblies
Publisher: American Chemical Society (ACS)
Date: 26-04-2012
DOI: 10.1021/JP301816P
Bilayer- and bulk-heterojunction solar cells using liquid crystalline porphyrins as donors by solution processing
Publisher: AIP Publishing
Date: 17-12-2007
DOI: 10.1063/1.2823586
Abstract: Bilayer- and bulk-heterojunction solar cells based on liquid crystalline porphyrins (donors) were fabricated by solution processing. These porphyrins are (i) highly absorptive over the wavelengths of the solar spectrum, (ii) having energy levels matched well with the electron acceptors and anode materials to facilitate charge separation and transfer, and (iii) of a unique homeotropically aligned architecture for efficient charge transport and light harvesting. Thermal annealing of these solar cells induced alignments of porphyrins in the photoactive layers, leading to a factor of 4–5 higher power conversion efficiencies and short circuit current densities than their counterpart devices without postannealing.
High-performance metal–iodine batteries enabled by a bifunctional dendrite-free Li–Na alloy anode
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0TA08072A
Abstract: Rechargeable aprotic alkali metal (Li and Na)–iodine (AM–I 2 ) batteries with high theoretical capacity and specific energy density have emerged as one of the promising energy storage technologies.
Rate-dependent, large-displacement deformation of vertically aligned carbon nanotube arrays
Publisher: Springer New York
Date: 2013
Multiwalled carbon nanotubes for flow-induced voltage generation
Publisher: AIP Publishing
Date: 15-03-2007
DOI: 10.1063/1.2710776
Abstract: Recently it has been reported that voltage can be generated by passing fluids over single-walled carbon nanotube (SWCNT) arrays with potential application to flow sensors with a large dynamic range. The present work investigates voltage generation properties of multiwalled carbon nanotubes (MWCNTs) as a function of the relative orientation of the nanotube array with respect to the flow direction, flow velocity, and solution ionic strength. It was found that the flow-induced voltage can be significantly enhanced by aligning the nanotubes along the flow direction, increasing the flow velocity and/or the ionic strength of the flowing liquid. A flow-induced voltage of ∼30mV has been generated from our perpendicularly-aligned MWCNT in an aqueous solution of 1M NaCl at a relatively low flow velocity of 0.0005m∕s, which is 15 times higher than the highest voltage reported for single-walled carbon nanotubes. The results are generally consistent with the pulsating asymmetric ratcheting mechanism proposed for SWCNT arrays, in which an asymmetrical spatial distributed strain forms from interactions with the polar and ionic species at the tube surface and is driven along the tube by the fluid flow.
Vertically Aligned BCN Nanotubes with High Capacitance
Publisher: American Chemical Society (ACS)
Date: 04-06-2012
DOI: 10.1021/NN301044V
Abstract: Using a chemical vapor deposition method, we have synthesized vertically aligned BCN nanotubes (VA-BCNs) on a Ni-Fe-coated SiO(2)/Si substrate from a melamine diborate precursor. The effects of pyrolysis conditions on the morphology and thermal property of grown nanotubes, as well as the nanostructure and composition of an in idual BCN nanotube, were systematically studied. It was found that nitrogen atoms are bonded to carbons in both graphitic and pyridinic forms and that the resultant VA-BCNs grown at 1000 °C show the highest specific capacitance (321.0 F/g) with an excellent rate capability and high durability with respect to nonaligned BCN (167.3 F/g) and undoped multiwalled carbon nanotubes (117.3 F/g) due to synergetic effects arising from the combined co-doping of B and N in CNTs and the well-aligned nanotube structure.
Nanotube 'crop circles'
Publisher: Royal Society of Chemistry (RSC)
Date: 1999
DOI: 10.1039/A901839E
Structurally Defined 3D Nanographene Assemblies via Bottom‐Up Chemical Synthesis for Highly Efficient Lithium Storage
Publisher: Wiley
Date: 10-10-2016
Abstract: Functionalized 3D nanographenes with controlled electronic properties have been synthesized through a multistep organic synthesis method and are further used as promising anode materials for lithium-ion batteries, exhibiting a much increased capacity (up to 950 mAh g
Ultrathin Wrinkled N-Doped Carbon Nanotubes for Noble-Metal Loading and Oxygen Reduction Reaction
Publisher: American Chemical Society (ACS)
Date: 14-09-2015
Abstract: We describe the fabrication of ultrathin wrinkled N-doped carbon nanotubes by an in situ solid-state method. The positions of Co catalyst were first labeled by good-dispersion and highly loaded Au and Pt, indicating the most of Co are unsealed. The resultant unique nanoarchitecture, which exhibits the features of carbon nanotube and graphene with a combined effect of 1D and 2D carbon-based nanostructures, exhibited a superior ORR activity to carbon nanotubes and graphene. Moreover, the novel catalysts showed a better durability and higher tolerance to methanol crossover and poisoning effects than those of Pt/C.
Multifunctional Carbon-Based Metal-Free Electrocatalysts for Simultaneous Oxygen Reduction, Oxygen Evolution, and Hydrogen Evolution
Publisher: Wiley
Date: 23-12-2017
Abstract: Rationally designed N, S co-doped graphitic sheets with stereoscopic holes (SHG) act as effective tri-functional catalysts for the oxygen reduction reaction, hydrogen evolution reaction, and oxygen evolution reaction, simultaneously. The multifunctional electrocatalytic activities originate from a synergistic effect of the N, S heteroatom doping and unique SHG architecture, which provide a large surface area and efficient pathways for electron and electrolyte/reactant transports.
Forces between end-adsorbed triblock copolymer chains and a bare mica surface in a good solvent.
Publisher: IOP Publishing
Date: 21-09-1991
Carbon‐Based Electrocatalysts for Acidic Oxygen Reduction Reaction
Publisher: Wiley
Date: 02-2023
Abstract: Oxygen reduction reaction (ORR) is vital for clean and renewable energy technologies, which require no fossil fuel but catalysts. Platinum (Pt) is the best‐known catalyst for ORR. However, its high cost and scarcity have severely hindered renewable energy devices (e.g., fuel cells) for large‐scale applications. Recent breakthroughs in carbon‐based metal‐free electrochemical catalysts (C‐MFECs) show great potential for earth‐abundant carbon materials as low‐cost metal‐free electrocatalysts towards ORR in acidic media. This article provides a focused, but critical review on C‐MFECs for ORR in acidic media with an emphasis on advances in the structure design and synthesis, fundamental understanding of the structure‐property relationship and electrocatalytic mechanisms, and their applications in proton exchange membrane fuel cells. Current challenges and future perspectives in this emerging field are also discussed.
Control of fluorescence emission color of benzo 15-crown-5 ether substituted oligo phenylene vinylene-ceramic nanocomposites
Publisher: Elsevier BV
Date: 08-2005
Patterned growth and contact transfer of well-aligned carbon nanotube films
Publisher: American Chemical Society (ACS)
Date: 05-1999
DOI: 10.1021/JP990342V
Author Correction: Scalable synthesis of hierarchically structured carbon nanotube–graphene fibres for capacitive energy storage
Publisher: Springer Science and Business Media LLC
Date: 30-06-2020
Edge-carboxylated graphene nanosheets via ball milling
Publisher: Proceedings of the National Academy of Sciences
Date: 27-03-2012
Abstract: Low-cost, high-yield production of graphene nanosheets (GNs) is essential for practical applications. We have achieved high yield of edge-selectively carboxylated graphite (ECG) by a simple ball milling of pristine graphite in the presence of dry ice. The resultant ECG is highly dispersable in various solvents to self-exfoliate into single- and few-layer (≤ 5 layers) GNs. These stable ECG (or GN) dispersions have been used for solution processing, coupled with thermal decarboxylation, to produce large-area GN films for many potential applications ranging from electronic materials to chemical catalysts. The electrical conductivity of a thermally decarboxylated ECG film was found to be as high as 1214 S/cm, which is superior to its GO counterparts. Ball milling can thus provide simple, but efficient and versatile, and eco-friendly (CO 2 -capturing) approaches to low-cost mass production of high-quality GNs for applications where GOs have been exploited and beyond.
Facile Synthesis of Black Phosphorus: an Efficient Electrocatalyst for the Oxygen Evolving Reaction
Publisher: Wiley
Date: 29-09-2016
Abstract: Black phosphorus (BP) as a new 2D material has attracted extensive attention because of its unique electronic, optical, and structural properties. However, the difficulties associated with BP synthesis severely hinder the further development of BP for any potential applications. On the other hand, searching for other potential applications of BP is also a big challenge. A facile strategy was developed for preparation of BP supported on Ti foil (BP-Ti) in a thin-film form. Surprisingly, the as-prepared BP shows advanced electrocatalytic activity for the oxygen evolution reaction (OER). To improve the OER activity of the electrocatalyst, BP was grown on a carbon nanotube network (BP-CNT), showing even better activity. The results demonstrate that BP can be prepared by a facile method and may be applied as an electrocatalyst.
Chromism of poly[1-(trimethylsilyl)-1-propyne]
Publisher: Elsevier BV
Date: 02-1997
Self-assembly of gold nanoparticles to carbon nanotubes using a thiol-terminated pyrene as interlinker
Publisher: Elsevier BV
Date: 2003
Surface immobilization of poly(ethylene oxide): Structure and properties
Publisher: Wiley
Date: 2000
DOI: 10.1002/1099-0488(20000901)38:17<2323::AID-POLB120>3.0.CO;2-6
Self-templating synthesis of heteroatom-doped large-scalable carbon anodes for high-performance lithium-ion batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1QI01105G
Abstract: We design a simple and cost-effective strategy to construct a large–scalable nitrogen-rich sulfur-doped porous carbon material as a high-performance anode material for lithium-ion batteries.
CO2 Overall Splitting by a Bifunctional Metal‐Free Electrocatalyst
Publisher: Wiley
Date: 10-09-2018
Abstract: Photo/electrochemical CO 2 splitting is impeded by the low cost‐effective catalysts for key reactions: CO 2 reduction (CDRR) and water oxidation. A porous silicon and nitrogen co‐doped carbon (SiNC) nanomaterial by a facile pyrolyzation was developed as a metal‐free bifunctional electrocatalyst. CO 2 ‐to‐CO and oxygen evolution (OER) partial current density under neutral conditions were enhanced by two orders of magnitude in the Tafel regime on SiNC relative to single‐doped comparisons beyond their specific area gap. The photovoltaic‐driven CO 2 splitting device with SiNC electrodes imitating photosynthesis yielded an overall solar‐to‐chemical efficiency of advanced 12.5 % (by multiplying energy efficiency of CO 2 splitting cell and photovoltaic device) at only 650 mV overpotential. Mechanism studies suggested the elastic electron structure of −Si(O)−C−N− unit in SiNC as the highly active site for CDRR and OER simultaneously by lowering the free energy of CDRR and OER intermediates adsorption.
Molecular engineering of conjugated polymers for solar cells and field-effect transistors: Side-chain versus main-chain electron acceptors
Publisher: Wiley
Date: 11-10-2012
DOI: 10.1002/POLA.25026
Efficient energy transfer between amphiphilic dendrimers with oligo(p-phenylenevinylene) core branches and oligo(ethylene oxide) termini in micelles
Publisher: Wiley
Date: 05-10-2013
DOI: 10.1002/POLA.26356
Reversible adsorption of conjugated amphiphilic dendrimers onto reduced graphene oxide (rGO) for fluorescence sensing
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1SM05755C
Metalized nanotube tips improve through thickness thermal conductivity in adhesive joints
Publisher: American Scientific Publishers
Date: 03-2009
DOI: 10.1166/JNN.2009.387
Abstract: The through-thickness thermal conductivity in conventional adhesive joints (of approximately 0.3 W/m-K) fails to meet the thermal load transfer requirement in numerous applications to enable lean manufacturing and improve system reliability to thermal load. Carbon nanotubes are known to possess extremely high thermal conductivity along the longitudinal axis. According to molecular dynamics simulations, the value can be as high as 3500 W/m-K at room temperature for multi-walled carbon nanotubes (MWCNT). Meanwhile, the transverse thermal conductivity perpendicular to the longitudinal axis of the MWCNTs is known to be relatively low, approximately 10-15 W/m-K. Existing studies of mixing the MWCNTs in polymers for adhesive joints only achieved minimal enhancement in the thermal conductivity and failed to satisfy the thermal property requirement for the adhesive joints. In order to properly utilize the superior axial thermal conductivity of the MWCNTs, vertically aligned MWCNTs have been used in this study and incorporated in the adhesive joint configuration. Analytical parametric study was conducted to identify critical parameters that affect the overall thermal conductivity of the joint and to provide guidelines for the process development. The process development involved growing the vertically aligned MWCNTs on silicon wafers. The aligned nanotube array was partially infused with epoxy adhesive. Selective reactive ion etching of the epoxy revealed the nanotube tips. In order to reduce the impedance mismatch and phonon scattering at the interface between the nanotube tips and the adherends, gold was thermally evaporated on the nanotube tips. The measured thermal conductivity of the adhesive joint device incorporating the MWCNTs was 262 W/m-K, which is significantly larger compared to that of less than 1 W/m-K without the MWCNTs.
Carbon nanomaterials for advanced energy conversion and storage
Publisher: Wiley
Date: 02-03-2012
Abstract: It is estimated that the world will need to double its energy supply by 2050. Nanotechnology has opened up new frontiers in materials science and engineering to meet this challenge by creating new materials, particularly carbon nanomaterials, for efficient energy conversion and storage. Comparing to conventional energy materials, carbon nanomaterials possess unique size-/surface-dependent (e.g., morphological, electrical, optical, and mechanical) properties useful for enhancing the energy-conversion and storage performances. During the past 25 years or so, therefore, considerable efforts have been made to utilize the unique properties of carbon nanomaterials, including fullerenes, carbon nanotubes, and graphene, as energy materials, and tremendous progress has been achieved in developing high-performance energy conversion (e.g., solar cells and fuel cells) and storage (e.g., supercapacitors and batteries) devices. This article reviews progress in the research and development of carbon nanomaterials during the past twenty years or so for advanced energy conversion and storage, along with some discussions on challenges and perspectives in this exciting field.
High‐Performance K–CO2 Batteries Based on Metal‐Free Carbon Electrocatalysts
Publisher: Wiley
Date: 29-01-2020
Abstract: Metal-CO
DNA-directed self-assembling of carbon nanotubes
Publisher: American Chemical Society (ACS)
Date: 08-12-2005
DOI: 10.1021/JA0446045
Abstract: Multicomponent structures were constructed by DNA-directed self-assembling of multiple carbon nanotubes and gold nanoparticles. The work presented here represents an important advance in constructing many multicomponent nanotube structures for multifunctional material and device applications.
Conducting Polymers for Flexible Supercapacitors
Publisher: Wiley
Date: 15-01-2019
Morphology and electrical properties of polyacetylene-polyisoprene conducting copolymers
Publisher: Elsevier BV
Date: 02-1997
Electromechanical characterization of carbon nanotubes grown on carbon fiber
Publisher: AIP Publishing
Date: 15-11-2009
DOI: 10.1063/1.3253747
Abstract: Mechanical and electrical properties of carbon fiber (CF) and vertically aligned carbon nanotubes (CNTs) have been thoroughly investigated in previous studies. Growth of radially aligned CNTs on silicon oxide (SiO2) coated CF has recently been accomplished resulting in multiscale composite fiber (CNT/SiO2/CF). CNT/SiO2/CF offers promise as stress and strain sensors in CF reinforced composite materials. However, to date there have been no investigations of the electromechanical properties of CNT/SiO2/CF that would facilitate their usage as sensors in composite materials, which is the focus of this research. This study investigates fundamental mechanical and electrical properties of CF, SiO2/CF (SiO2 coated CF), and CNT/SiO2/CF during localized transverse compression at low loads (μN to mN) and small displacements (nm to a few μms). Force, strain, stiffness, and electrical resistance were monitored simultaneously during compression experiments. For CF, resistance decreased sharply upon compressive loading with hysteresis in both force and resistance being observed at low strain. For SiO2/CF, high resistance and negligible electrical conduction occurred, and the force-displacement curve was linear. CNT/SiO2/CF stiffness increased as force and strain increased and became comparable to that of CF at high strain (∼30%). Hysteresis in both force-displacement and resistance-displacement curves was observed with CNT/SiO2/CF, but was more evident as maximum strain increased and did not depend on strain rate. Force was higher and resistance was lower during compression as compared to decompression. Hysteretic energy loss is associated with internal friction between entangled CNTs. Van der Waals force between deformed and entangled CNTs hindered disentanglement, which reduced the number of electrical current paths and increased resistance during decompression. The results of this study provide new understanding of the mechanical and electrical behavior of CNT/SiO2/CF that will facilitate usage as stress and strain sensors in both stand-alone and composite materials applications.
Design, synthesis and photophysical properties of a hyperbranched conjugated polymer
Publisher: Elsevier BV
Date: 03-2000
Determination of nitrite with the electrocatalytic property to the oxidation of nitrite on thionine modified aligned carbon nanotubes
Publisher: Elsevier BV
Date: 2007
High-Performance, Stretchable, Wire-Shaped Supercapacitors
Publisher: Wiley
Date: 17-11-2014
Abstract: A general approach toward extremely stretchable and highly conductive electrodes was developed. The method involves wrapping a continuous carbon nanotube (CNT) thin film around pre-stretched elastic wires, from which high-performance, stretchable wire-shaped supercapacitors were fabricated. The supercapacitors were made by twisting two such CNT-wrapped elastic wires, pre-coated with poly(vinyl alcohol)/H3PO4 hydrogel, as the electrolyte and separator. The resultant wire-shaped supercapacitors exhibited an extremely high elasticity of up to 350% strain with a high device capacitance up to 30.7 F g(-1), which is two times that of the state-of-the-art stretchable supercapacitor under only 100% strain. The wire-shaped structure facilitated the integration of multiple supercapacitors into a single wire device to meet specific energy and power needs for various potential applications. These supercapacitors can be repeatedly stretched from 0 to 200% strain for hundreds of cycles with no change in performance, thus outperforming all the reported state-of-the-art stretchable electronics.
Polymer-masking for controlled functionalization of carbon nanotubes
Publisher: Royal Society of Chemistry (RSC)
Date: 2007
DOI: 10.1039/B707698C
Abstract: An effective and versatile method for tube-length-specific functionalization of carbon nanotubes through a controllable embedment of vertically-aligned carbon nanotubes into polymer matrices is reported, which allows not only asymmetric functionalization of nanotube sidewalls, but also facile introduction of new properties (e.g. magnetic) onto the region-selectively functionalized carbon nanotubes.
Crown ether substituted phenylenevinylene oligomers: Synthesis and electroluminescent properties
Publisher: Royal Society of Chemistry (RSC)
Date: 2000
DOI: 10.1039/A907547J
Sulfur-Doped Graphene Derived from Cycled Lithium-Sulfur Batteries as a Metal-Free Electrocatalyst for the Oxygen Reduction Reaction
Publisher: Wiley
Date: 05-12-2014
Abstract: Heteroatom-doped carbon materials have been extensively investigated as metal-free electrocatalysts to replace commercial Pt/C catalysts in oxygen reduction reactions in fuel cells and Li-air batteries. However, the synthesis of such materials usually involves high temperature or complicated equipment. Graphene-based sulfur composites have been recently developed to prolong the cycling life of Li-S batteries, one of the most attractive energy-storage devices. Given the high cost of graphene, there is significant demand to recycle and reuse graphene from Li-S batteries. Herein, we report a green and cost-effective method to prepare sulfur-doped graphene, achieved by the continuous charge/discharge cycling of graphene-sulfur composites in Li-S batteries. This material was used as a metal-free electrocatalyst for the oxygen reduction reaction and shows better electrocatalytic activity than pristine graphene and better methanol tolerance durability than Pt/C.
High-performance transparent and stretchable all-solid supercapacitors based on highly aligned carbon nanotube sheets
Publisher: Springer Science and Business Media LLC
Date: 09-01-2014
DOI: 10.1038/SREP03612
A bio-inspired Co3 O4 -polypyrrole-graphene complex as an efficient oxygen reduction catalyst in one-step ball milling
Publisher: Springer Science and Business Media LLC
Date: 03-09-2015
Facile fabrication of 3D layer-by-layer graphene-gold nanorod hybrid architecture for hydrogen peroxide based electrochemical biosensor
Publisher: Elsevier BV
Date: 03-2015
Accelerated Water Dissociation Kinetics By Electron‐Enriched Cobalt Sites for Efficient Alkaline Hydrogen Evolution
Publisher: Wiley
Date: 02-12-2021
Abstract: Sluggish water dissociation kinetics in the Volmer step on platinum‐free electrocatalysts limits the development of hydrogen evolution from economical water‐alkali electrolyser. Herein, an unusual nanosheets electrocatalyst of molybdenum‐doped cobalt selenide with selenium vacancy encapsulated within N‐doped carbon matrix (Mo‐Co 0.85 Se VSe /NC) for efficient hydrogen evolution reaction (HER) is reported. Benefiting from the optimized electronic structure, this Mo‐Co 0.85 Se VSe /NC nanosheet exhibits a high catalytic activity for alkaline HER, achieving the current densities of 10 and 200 mA cm −2 at low overpotentials of 151 and 275 mV, respectively. These results are among the highest catalytic activities in respect with all previously reported transition‐metal‐selenide based HER electrocatalysts. The combined in situ spectroscopic and theoretical studies reveal that the incorporation of Mo‐dopant and Se vacancies into Co 0.85 Se efficiently enhances electron transfer from Mo to Co atom through the bridging Se atom, leading to the formation of enriched electronic Co site to accelerate water dissociation, eventually facilitating the overall alkaline HER process. An integrated Zn‐H 2 O battery with a Mo‐Co 0.85 Se VSe /NC cathode is developed to further demonstrate the potential applications of the newly developed HER catalyst.
Size- and Shape-Dependent Fluorescence Quenching of Gold Nanoparticles on Perylene Dye
Publisher: Wiley
Date: 27-06-2013
Can silver nanoparticles be useful as potential biological labels?
Publisher: IOP Publishing
Date: 06-05-2008
DOI: 10.1088/0957-4484/19/23/235104
Abstract: Silver (Ag) nanoparticles have unique plasmon-resonant optical scattering properties that are finding use in nanomedical applications such as signal enhancers, optical sensors, and biomarkers. In this study, we examined the chemical and biological properties of Ag nanoparticles of similar sizes, but that differed primarily in their surface chemistry (hydrocarbon versus polysaccharide), in neuroblastoma cells for their potential use as biological labels. We observed strong optical labeling of the cells in a high illumination light microscopy system after 24 h of incubation due to the excitation of plasmon resonance by both types of Ag nanoparticle. Surface binding of both types of Ag nanoparticle to the plasma membrane of the cells was verified with scanning electron microscopy as well as the internalization and localization of the Ag nanoparticles into intracellular vacuoles in thin cell sections with transmission electron microscopy. However, the induction of reactive oxygen species (ROS), degradation of mitochondrial membrane integrity, disruption of the actin cytoskeleton, and reduction in proliferation after stimulation with nerve growth factor were found after incubation with Ag nanoparticles at concentrations of 25 µg ml(-1) or greater, with a more pronounced effect produced by the hydrocarbon-based Ag nanoparticles in most cases. Therefore, the use of Ag nanoparticles as potential biological labels, even if the surface is chemically modified with a biocompatible material, should be approached with caution.
Solvent-free functionalization and transfer of aligned carbon nanotubes with vapor-deposited polymer nanocoatings
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0JM02506B
Carbon-based electrocatalysts for advanced energy conversion and storage
Publisher: American Association for the Advancement of Science (AAAS)
Date: 07-08-2015
Abstract: A review of the recent advances, along with perspectives and challenges, in the fast-growing field of carbon-based electrocatalysts.
Plasma-polymerized polyaniline films: Synthesis and characterization
Publisher: Wiley
Date: 03-1998
DOI: 10.1002/(SICI)1099-0518(199803)36:4<633::AID-POLA12>3.0.CO;2-N
Effect of microstructure of nitrogen-doped graphene on oxygen reduction activity in fuel cells
Publisher: American Chemical Society (ACS)
Date: 03-05-2012
DOI: 10.1021/LA2043262
Abstract: The development of fuel cells as clean-energy technologies is largely limited by the prohibitive cost of the noble-metal catalysts needed for catalyzing the oxygen reduction reaction (ORR) in fuel cells. A fundamental understanding of catalyst design principle that links material structures to the catalytic activity can accelerate the search for highly active and abundant nonmetal catalysts to replace platinum. Here, we present a first-principles study of ORR on nitrogen-doped graphene in acidic environment. We demonstrate that the ORR activity primarily correlates to charge and spin densities of the graphene. The nitrogen doping and defects introduce high positive spin and/or charge densities that facilitate the ORR on graphene surface. The identified active sites are closely related to doping cluster size and dopant-defect interactions. Generally speaking, a large doping cluster size (number of N atoms >2) reduces the number of catalytic active sites per N atom. In combination with N clustering, Stone-Wales defects can strongly promote ORR. For four-electron transfer, the effective reversible potential ranges from 1.04 to 1.15 V/SHE, depending on the defects and cluster size. The catalytic properties of graphene could be optimized by introducing small N clusters in combination with material defects.
Nitrogen-Doped Holey Graphene as an Anode for Lithium-Ion Batteries with High Volumetric Energy Density and Long Cycle Life
Publisher: Wiley
Date: 20-10-2015
Abstract: Nitrogen-doped holey graphene (N-hG) as an anode material for lithium-ion batteries has delivered a maximum volumetric capacity of 384 mAh cm(-3) with an excellent long-term cycling life up to 6000 cycles, and as an electrochemical capacitor has delivered a maximum volumetric energy density of 171.2 Wh L(-1) and a volumetric capacitance of 201.6 F cm(-3) .
Novel MOF-Derived Co@N-C Bifunctional Catalysts for Highly Efficient Zn–Air Batteries and Water Splitting
Publisher: Wiley
Date: 19-01-2018
Abstract: Metal-organic frameworks (MOFs) and MOF-derived materials have recently attracted considerable interest as alternatives to noble-metal electrocatalysts. Herein, the rational design and synthesis of a new class of Co@N-C materials (C-MOF-C2-T) from a pair of enantiotopic chiral 3D MOFs by pyrolysis at temperature T is reported. The newly developed C-MOF-C2-900 with a unique 3D hierarchical rodlike structure, consisting of homogeneously distributed cobalt nanoparticles encapsulated by partially graphitized N-doped carbon rings along the rod length, exhibits higher electrocatalytic activities for oxygen reduction and oxygen evolution reactions (ORR and OER) than that of commercial Pt/C and RuO
Effect of carbon nanotubes on the interfacial shear strength of T650 carbon fiber in an epoxy matrix
Publisher: Elsevier BV
Date: 06-2009
Organic modification of carbon nanotubes
Publisher: Science China Press., Co. Ltd.
Date: 2002
DOI: 10.1360/02TB9102
Ocular biocompatibility evaluation of hydroxyl-functionalized graphene
Publisher: Elsevier BV
Date: 05-2015
DOI: 10.1016/J.MSEC.2015.01.086
Abstract: We have presented our recent efforts on genotoxicity and intraocular biocompatibility of hydroxylated graphene (G-OH) prepared by ball milling. We have previously demonstrated that the as-synthesized G-OH could be considered as an excellent alternative for graphene oxide which had been applied widely. Following our last report on G-OH, we carried out detailed studies on genotoxicity and in vivo biocompatibility of G-OH in this work. Less than 5% enhanced caspase-3 level was observed for cells exposed to more than 50 μg/mL G-OH over 72 h, suggesting G-OH caused cell apoptosis was slight. The G-OH induced DNA damage was also found to be mild since expression of p53 and ROS regeneration level was quite low even at high concentration of G-OH over a long time. Cell viability was found to be higher than 90% with 50 μg/mL G-OH and 80% with 100 μg/mL G-OH using flow cytometry. Comet results suggested that less than 5% tail could be found with 100 μg/mL G-OH. TEM results confirmed that G-OH could penetrate into and out of the cytoplasm by means of endocytosis and exocytosis without causing damage on cell membranes. In vivo biocompatibility of G-OH was studied by intravitreal injection of G-OH into rabbits. The ocular fundus photography results showed that G-OH could be diffused in the vitreous body gradually without any damage caused. Injection of G-OH had caused few damages on eyesight related functions such as intraocular pressure, electroretinogram and histological structures of the retina.
Nitrogen enriched porous carbon spheres: Attractive materials for supercapacitor electrodes and CO2 adsorption
Publisher: American Chemical Society (ACS)
Date: 14-04-2014
DOI: 10.1021/CM5001895
Cytotoxicity and genotoxicity of bacterial magnetosomes against human retinal pigment epithelium cells
Publisher: Springer Science and Business Media LLC
Date: 06-2016
DOI: 10.1038/SREP26961
Abstract: A variety of nanomaterials have been developed for ocular diseases. The ability of these nanomaterials to pass through the blood-ocular barrier and their biocompatibility are essential characteristics that must be considered. Bacterial magnetosomes (BMs) are a type of biogenic magnetic nanomaterials synthesized by magnetotactic bacteria. Due to their unique biomolecular membrane shell and narrow size distribution of approximately 30 nm, BMs can pass through the blood-brain barrier. The similarity of the blood-ocular barrier to the blood-brain barrier suggests that BMs have great potential as treatments for ocular diseases. In this work, BMs were isolated from magnetotactic bacteria and evaluated in various cytotoxicity and genotoxicity studies in human retinal pigment epithelium (ARPE-19) cells. The BMs entered ARPE-19 cells by endocytosis after a 6-h incubation and displayed much lower cytotoxicity than chemically synthesized magnetic nanoparticles (MNPs). MNPs exhibited significantly higher genotoxicity than BMs and promoted the expression of Bax (the programmed cell death acceleration protein) and the induction of greater cell necrosis. In BM-treated cells, apoptosis tended to be suppressed via increased expression of the Bcl-2 protein. In conclusion, BMs display excellent biocompatibility and potential for use in the treatment of ocular diseases.
Highly efficient electrocatalysts for oxygen reduction based on 2D covalent organic polymers complexed with non-precious metals
Publisher: Wiley
Date: 29-01-2014
Abstract: A class of 2D covalent organic polymers (COPs) incorporating a metal (such as Fe, Co, Mn) with precisely controlled locations of nitrogen heteroatoms and holes were synthesized from various N-containing metal-organic complexes (for ex le, metal-porphyrin complexes) by a nickel-catalyzed Yamamoto reaction. Subsequent carbonization of the metal-incorporated COPs led to the formation of COP-derived graphene analogues, which acted as efficient electrocatalysts for oxygen reduction in both alkaline and acid media with a good stability and free from any methanol-crossover/CO-poisoning effects.
Highly Efficient Oxygen Reduction Reaction Electrocatalysts Synthesized under Nanospace Confinement of Metal-Organic Framework
Publisher: American Chemical Society (ACS)
Date: 18-07-2017
Abstract: The output energy capacity of green electrochemical devices, e.g., fuel cells, depends strongly on the sluggish oxygen reduction reaction (ORR), which requires catalysts. One of the desired features for highly efficient ORR electrocatalytic materials is the richness of well-defined activate sites. Herein, we developed a facile approach to prepare highly efficient nonprecious metal and nitrogen-doped carbon-based ORR catalysts based on covalent organic polymers (COPs) synthesized in situ in the nanoconfined space of highly ordered metal organic frameworks (MOFs). The MOF templet ensured the developed electrocatalysts possess a high surface area with homogeneously distributed small metal/nitrogen active sites, as confirmed by X-ray absorption fine structure measurements and first-principles calculations, leading to highly efficient ORR electrocatalytic activity. Notably, the developed COP-TPP(Fe)@MOF-900 exhibits a 16 mV positive half-wave potential compared with the benchmarked Pt/C.
Biocompatible nucleus-targeted graphene quantum dots for selective killing of cancer cells via DNA damage
Publisher: Springer Science and Business Media LLC
Date: 16-02-2021
DOI: 10.1038/S42003-021-01713-1
Abstract: Graphene quantum dots (GQDs) are nano-sized graphene slices. With their small size, lamellar and aromatic-ring structure, GQDs tend to enter into the cell nucleus and interfere with DNA activity. Thus, GQD alone is expected to be an anticancer reagent. Herein, we developed GQDs that suppress the growth of tumor by selectively damaging the DNA of cancer cells. The amine-functionalized GQDs were modified with nucleus targeting TAT peptides (TAT-NGs) and further grafted with cancer-cell-targeting folic acid (FA) modified PEG via disulfide linkage (FAPEG-TNGs). The resulting FAPEG-TNGs exhibited good biocompatibility, nucleus uptake, and cancer cell targeting. They adsorb on DNA via the π–π and electrostatic interactions, which induce the DNA damage, the upregulation of the cell apoptosis related proteins, and the suppression of cancer cell growth, ultimately. This work presents a rational design of GQDs that induce the DNA damage to realize high therapeutic performance, leading to a distinct chemotherapy strategy for targeted tumor therapy.
Polyaniline nanotubes doped with sulfonated carbon nanotubes made via a self-assembly process
Publisher: Wiley
Date: 16-01-2003
Ancient Chemistry “Pharaoh’s Snakes” for Efficient Fe-/N-Doped Carbon Electrocatalysts
Publisher: American Chemical Society (ACS)
Date: 09-03-2018
Abstract: The method of fabricating nonprecious metal electrocatalysts with high activity and durability through a facile and eco-friendly procedure is of great significance to the development of low-cost fuel cells and metal-air batteries. Herein, we present that an ancient chemical reaction of "Pharaoh's snakes" can be a fast and convenient technique to prepare Fe-/N-doped carbon (Fe/N-C) nanosheet/nanotube electrocatalysts with sugar, soda, melamine, and iron nitrate as precursors. The resultant Fe/N-C catalyst has a hierarchically porous structure, a large surface area, and uniformly distributed active sites. The catalyst shows high electrocatalytic activities toward both the oxygen reduction reaction with a half-wave potential of 0.90 V (vs reversible hydrogen electrode) better than that of Pt/C and the oxygen evolution reaction with an overpotential of 0.46 V at the current density of 10 mA cm
Transferrin-coated magnetic upconversion nanoparticles for efficient photodynamic therapy with near-infrared irradiation and luminescence bioimaging
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7NR03019C
Abstract: A novel platform based on transferrin coated magnetic upconversion nanoparticles was developed for near-infrared light induced imaging and photodynamic therapy with enhanced efficiency by magnetic force.
Controlled fabrication of large-scale aligned carbon nanofiber/nanotube patterns by photolithography
Publisher: Wiley
Date: 16-08-2002
DOI: 10.1002/1521-4095(20020816)14:16<1140::AID-ADMA1140>3.0.CO;2-5
Nitrogen-doped carbon nanotube arrays with high electrocatalytic activity for oxygen reduction
Publisher: American Association for the Advancement of Science (AAAS)
Date: 06-02-2009
Abstract: The large-scale practical application of fuel cells will be difficult to realize if the expensive platinum-based electrocatalysts for oxygen reduction reactions (ORRs) cannot be replaced by other efficient, low-cost, and stable electrodes. Here, we report that vertically aligned nitrogen-containing carbon nanotubes (VA-NCNTs) can act as a metal-free electrode with a much better electrocatalytic activity, long-term operation stability, and tolerance to crossover effect than platinum for oxygen reduction in alkaline fuel cells. In air-saturated 0.1 molar potassium hydroxide, we observed a steady-state output potential of –80 millivolts and a current density of 4.1 milli s per square centimeter at –0.22 volts, compared with –85 millivolts and 1.1 milli s per square centimeter at –0.20 volts for a platinum-carbon electrode. The incorporation of electron-accepting nitrogen atoms in the conjugated nanotube carbon plane appears to impart a relatively high positive charge density on adjacent carbon atoms. This effect, coupled with aligning the NCNTs, provides a four-electron pathway for the ORR on VA-NCNTs with a superb performance.
Preparation of tunable 3D pillared carbon nanotube-graphene networks for high-performance capacitance
Publisher: American Chemical Society (ACS)
Date: 17-10-2011
DOI: 10.1021/CM2021214
Living cells directly growing on a DNA/Mn<inf>3</inf>(PO<inf>4</inf>)<inf>2</inf>-immobilized and vertically aligned CNT array as a free-standing hybrid film for highly sensitive in situ detection of released superoxide anions
Publisher: Wiley
Date: 25-08-2015
Advanced syntheses and microfabrications of conjugated polymers, C60 -containing polymers and carbon nanotubes for optoelectronic applications
Publisher: Wiley
Date: 07-1999
DOI: 10.1002/(SICI)1099-1581(199907)10:7<357::AID-PAT886>3.0.CO;2-9
Understanding of the capacity contribution of carbon in phosphorus-carbon composites for high-performance anodes in lithium ion batteries
Publisher: Springer Science and Business Media LLC
Date: 18-01-2017
Plasma-Engraved Co3 O4 Nanosheets with Oxygen Vacancies and High Surface Area for the Oxygen Evolution Reaction
Publisher: Wiley
Date: 17-03-2016
Abstract: Co3 O4 , which is of mixed valences Co(2+) and Co(3+) , has been extensively investigated as an efficient electrocatalyst for the oxygen evolution reaction (OER). The proper control of Co(2+) /Co(3+) ratio in Co3 O4 could lead to modifications on its electronic and thus catalytic properties. Herein, we designed an efficient Co3 O4 -based OER electrocatalyst by a plasma-engraving strategy, which not only produced higher surface area, but also generated oxygen vacancies on Co3 O4 surface with more Co(2+) formed. The increased surface area ensures the Co3 O4 has more sites for OER, and generated oxygen vacancies on Co3 O4 surface improve the electronic conductivity and create more active defects for OER. Compared to pristine Co3 O4 , the engraved Co3 O4 exhibits a much higher current density and a lower onset potential. The specific activity of the plasma-engraved Co3 O4 nanosheets (0.055 mA cm(-2) BET at 1.6 V) is 10 times higher than that of pristine Co3 O4 , which is contributed by the surface oxygen vacancies.
From conventional technology to carbon nanotechnology. The fourth industrial revolution and the discoveries of C60 , carbon nanotube and nanodiamond.
Publisher: Elsevier
Date: 2006
Carbon-Defect-Driven Electroless Deposition of Pt Atomic Clusters for Highly Efficient Hydrogen Evolution
Publisher: American Chemical Society (ACS)
Date: 23-02-2020
DOI: 10.1021/JACS.9B11524
Controlled preparation and electron emission properties of three-dimensional micropatterned aligned carbon nanotubes
Publisher: AIP Publishing
Date: 04-09-2006
DOI: 10.1063/1.2345253
Abstract: The authors have developed a simple, but very effective and versatile, dry contact transfer technique for controlled preparation of three-dimensional (3D) perpendicularly aligned carbon nanotube micropatterns with region-specific tube lengths. The 3D micropatterned aligned carbon nanotubes were demonstrated to show a stepwise electron emission behavior, providing an effective means for developing multifunctional electron emitters with tailor-made field emission characteristics.
Carbon nanomaterials as metal-free catalysts in next generation fuel cells
Publisher: Elsevier BV
Date: 07-2012
Rationally designed graphene-nanotube 3D architectures with a seamless nodal junction for efficient energy conversion and storage
Publisher: American Association for the Advancement of Science (AAAS)
Date: 04-09-2015
Abstract: Seamlessly joint graphene-nanotube 3D architectures were created by one-step CVD for efficient energy conversion and storage.
Graph drawings with few slopes
Publisher: Elsevier BV
Date: 10-2007
Relieving Stress Concentration through Anion–Cation Codoping toward Highly Stable Nickel-Rich Cathode
Publisher: American Chemical Society (ACS)
Date: 04-10-2023
Macroscopic graphene fibers directly assembled from CVD-grown fiber-shaped hollow graphene tubes
Publisher: Wiley
Date: 16-10-2015
Abstract: Using a copper wire as the substrate for the CVD growth of a hollow multilayer graphene tube, we prepared a macroscopic porous graphene fiber by removing the copper in an aqueous mixture solution of iron chloride (FeCl3, 1 M) and hydrochloric acid (HCl, 3 M) and continuously drawing the newly released graphene tube out of the liquid. The length of the macroscopic graphene fiber thus produced is determined mainly by the length of the copper wire used. The resultant macroscopic graphene fiber with the integrated graphene structure exhibited a high electrical conductivity (127.3 S cm(-1)) and good flexibility over thousands bending cycles, showing great promise as flexible electrodes for wearable optoelectronics and energy devices-exemplified by its use as a flexible conductive wire for lighting a LED and a cathode in a fiber-shaped dye-sensitized solar cell (DSSC) with one of the highest energy conversion efficiencies (3.25%) among fiber-shaped DSSCs.
Light-emitting electrochemical cells and light-emitting diodes based on ionic conductive poly(phenylene vinylene): a new chemical sensor system
Publisher: Elsevier BV
Date: 03-1999
Amperometric glucose biosensor based on platinum nanoparticles combined aligned carbon nanotubes electrode
Publisher: Wiley
Date: 05-2007
Gabapentinoid detection in coronial casework in Gold Coast, Australia: a 5-year retrospective study
Publisher: Springer Science and Business Media LLC
Date: 14-08-2023
DOI: 10.1007/S12024-023-00694-3
Abstract: Gabapentinoids is a class of drug with analgesic, anxiolytic, and anticonvulsant properties and has a reported increase in prescription, use, and adverse outcomes. Regional studies are scant, and postmortem toxicological data may characterise patterns of regional use and inform local interventions. Characterising drug and non-drug-related deaths with gabapentinoid detection may also aid in toxicology interpretation. A 5-year retrospective study on all deaths admitted to the Gold Coast University Hospital under where toxicological analysis was performed. Of the gabapentinoids, only pregabalin was detected over the study period, and annual rates of detection did not differ significantly over the period (7.4–12.4%). In cases where pregabalin was detected, it was 15 times more likely to be a drug-related death. Drug-related deaths where pregabalin was detected have higher levels of pregabalin, are younger, and had a greater proportion of concurrent opioid detection. Postmortem detection of pregabalin was associated with drug-related deaths. Higher levels, younger decedents, and concurrent use of opioids were found in drug-related deaths. Public health interventions and regulated prescribing to target concurrent pregabalin and opioid use may address the burden of pregabalin drug-related deaths.
High-performance sodium ion batteries based on a 3D anode from nitrogen-doped graphene foams
Publisher: Wiley
Date: 16-02-2015
Abstract: A 3D N-doped graphene foam with a 6.8 at% nitrogen content is prepared by annealing a freeze-dried graphene oxide foam in ammonia. It is used as an anode in sodium ion batteries to deliver a high initial reversible capacity of 852.6 mA h g(-1) at 1 C between 0.02 and 3 V with a long-term retention of 69.7% after 150 cycles.
Ultrahigh-Capacity Lithium-Oxygen Batteries Enabled by Dry-Pressed Holey Graphene Air Cathodes
Publisher: American Chemical Society (ACS)
Date: 05-04-2017
DOI: 10.1021/ACS.NANOLETT.7B00872
Abstract: Lithium-oxygen (Li-O
Light-emitting electrochemical cells with microsecond response times based on PPPs and novel PPVs
Publisher: Elsevier BV
Date: 06-1999
Structural Evaluation along the Nanotube Length for Super-long Vertically Aligned Double-Walled Carbon Nanotube Arrays
Publisher: American Chemical Society (ACS)
Date: 04-2012
DOI: 10.1021/JP802059T
Boosting Electroreduction Kinetics of Nitrogen to Ammonia via Tuning Electron Distribution of Single‐Atomic Iron Sites
Publisher: Wiley
Date: 05-03-2021
Conformational Transitions of End-Adsorbed Copolymer Chains at the Liquid/Solid Interface
Publisher: American Chemical Society (ACS)
Date: 07-1995
DOI: 10.1021/MA00120A015
Vertically-aligned carbon nanotubes for electrochemical energy conversion and storage
Publisher: Springer International Publishing
Date: 2016
Novel benzo[1,2-b:4,5-b′]dithiophene-benzothiadiazole derivatives with variable side chains for high-performance solar cells
Publisher: Wiley
Date: 05-09-2011
Nitrogen-doped graphene foams as metal-free counter electrodes in high-performance dye-sensitized solar cells
Publisher: Wiley
Date: 04-11-2012
Adhesion, friction and wear on the nanoscale of MWNT tips and SWNT and MWNT arrays
Publisher: IOP Publishing
Date: 21-02-2008
DOI: 10.1088/0957-4484/19/12/125702
Abstract: The nanotribological characterization of carbon nanotubes is fundamental for the exploration of new sliding applications. In this study, a comprehensive investigation of adhesion, friction and wear of a multiwalled nanotube (MWNT) tip, and SWNT (single-walled nanotube) and MWNT arrays has been carried out. A nonlinear response of the MWNT tip is observed when the tip is brought into and out of contact with various surfaces. A nonlinear response occurs due to the buckling of the nanotube and its subsequent sliding on the surface. In addition to the role of surface chemistry, it can also explain the relatively high value of the coefficient of friction obtained on different surfaces, as compared to that of Si and Si(3)N(4) tips. The adhesion and friction studies carried out on SWNT and MWNT arrays using Si tips show that SWNT arrays, compared to MWNT arrays, exhibit lower values, possibly due to lower van der Waals forces as a result of lower packing density and higher flexibility. The wear tests conducted with the MWNT tip and a Si tip on a gold film, at two normal loads, show less damage of the surface when the MWNT tip is used because of the MWNT acting as a compliant spring, absorbing part of the load. Wear tests conducted with a Si tip on SWNT and MWNT arrays show that the arrays do not wear. The tip wear and the friction force in the SWNT array are lower, because of lower adhesion and higher flexibility of the SWNTs, which causes less opposition to the motion of the tip.
Multifunctional electrocatalysts derived from conducting polymer and metal organic framework complexes
Publisher: Elsevier BV
Date: 03-2018
Natural tea-leaf-derived, ternary-doped 3D porous carbon as a high-performance electrocatalyst for the oxygen reduction reaction
Publisher: Springer Science and Business Media LLC
Date: 05-2016
Graphene Quantum Dots Supported by Graphene Nanoribbons with Ultrahigh Electrocatalytic Performance for Oxygen Reduction
Publisher: American Chemical Society (ACS)
Date: 15-06-2015
DOI: 10.1021/JACS.5B03799
Abstract: A new class of oxygen reduction reaction (ORR) catalysts based on graphene quantum dots (GQDs) supported by graphene nanoribbons (GNRs) has been developed through a one-step simultaneous reduction reaction, leading to ultrahigh performance for O reduction with an excellent electrocatalytic activity (higher limiting current density and lower overpotential than those of platinum) and high selectivity and stability in alkaline media comparable to the best C-based ORR catalysts reported so far. Electron microscopy revealed numerous surface/edge defects on the GQD/GNR surfaces and at their interface to act as the active sites. This, coupled with efficient charge transfer between the intimately contacted GQDs and GNRs, rationalized the observed ultrahigh electrocatalytic performance for the resultant GQD-GNR hybrids. Thus, this study opens a new direction for developing low-cost, highly efficient, C-based ORR electrocatalysts.
Nitrogen-doped graphene quantum dots with oxygen-rich functional groups
Publisher: American Chemical Society (ACS)
Date: 09-12-2012
DOI: 10.1021/JA206030C
Abstract: Graphene quantum dots (GQDs) represent a new class of quantum dots with unique properties. Doping GQDs with heteroatoms provides an attractive means of effectively tuning their intrinsic properties and exploiting new phenomena for advanced device applications. Herein we report a simple electrochemical approach to luminescent and electrocatalytically active nitrogen-doped GQDs (N-GQDs) with oxygen-rich functional groups. Unlike their N-free counterparts, the newly produced N-GQDs with a N/C atomic ratio of ca. 4.3% emit blue luminescence and possess an electrocatalytic activity comparable to that of a commercially available Pt/C catalyst for the oxygen reduction reaction (ORR) in an alkaline medium. In addition to their use as metal-free ORR catalysts in fuel cells, the superior luminescence characteristic of N-GQDs allows them to be used for biomedical imaging and other optoelectronic applications.
Flexible supercapacitors based on carbon nanomaterials
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TA00567H
Metal–Organic Frameworks with Assembled Bifunctional Microreactor for Charge Modulation and Strain Generation toward Enhanced Oxygen Electrocatalysis
Publisher: American Chemical Society (ACS)
Date: 26-05-2022
Abstract: Two-dimensional metal-organic frameworks (MOFs) have served as favorable prototypes for electrocatalytic oxygen evolution reaction (OER). Despite promising catalytic activity, their OER reaction kinetics are still limited by the sluggish four-electron transfer process. Herein, we develop a ferrocene carboxylic acid (FcCA) partially substituted cobalt-terephthalic acid (CoBDC) catalyst with a bifunctional microreactor composed of two species of Co active sites and ligand FcCA (CoBDC FcCA). Benefiting from the ultrathin nanosheet structure, CoBDC FcCA catalyst exhibits an excellent OER performance with a low overpotential of 280 mV to reach 10 mA cm
Functionalization of Graphene Oxide with Polyhedral Oligomeric Silsesquioxane (POSS) for Multifunctional Applications
Publisher: American Chemical Society (ACS)
Date: 06-2012
DOI: 10.1021/JZ3005877
Abstract: Through the amide formation between amine-functionalized polyhedral oligomeric silsesquioxane (POSS) and oxygen-containing groups (e.g., epoxy and carboxyl groups) in graphene oxide (GO), we have synthesized POSS-functionalized graphene nanosheets (POSS-graphene), which are highly soluble in various organic solvents attractive for multifunctional applications. Thin films from solution casting of the resultant POSS-graphene were found to show superhydrophobic properties with a water/air contact angle of ∼157°, while the superhydrophobic POSS-graphene powder could be used to construct liquid marbles. In addition, the POSS-graphene hybrids were also used as novel nanofillers to increase the glass transition temperature (Tg) and decompose temperature (Td) for polymers.
Grafting of buckminsterfullerene onto polydiene: A new route to fullerene-containing polymers
Publisher: American Chemical Society (ACS)
Date: 11-1995
DOI: 10.1021/J100048A002
Multi-TpyCo2+-based conductive supramolecular hydrogels constructed by “bridge bonds” for rechargeable Zn-air batteries with ultrastable cycling stability over 1100 h
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TA01716D
Abstract: The multi-TpyCo 2+ -based supramolecular hydrogel presents the remolding property and shows a low overpotential of 264 mV at 10 mA cm −2 for oxygen evolution reaction (OER) and an ultrastable cycling stability over 1100 h for liquid Zn–air battery.
Graphitic carbon nitrides supported by nitrogen-doped graphene as efficient metal-free electrocatalysts for oxygen reduction
Publisher: Elsevier BV
Date: 09-2015
Photovoltaic devices with methanofullerenes as electron acceptors
Publisher: American Chemical Society (ACS)
Date: 10-10-2002
DOI: 10.1021/JP025973V
Functionalized surfaces based on polymers and carbon nanotubes for some biomedical and optoelectronic applications
Publisher: IOP Publishing
Date: 27-08-2003
Photogeneration of conducting polymer patterns in iodinated cis-1,4-polybutadiene films
Publisher: Elsevier BV
Date: 09-2002
Carbon Nanotube Electroactive Polymer Materials: Opportunities and Challenges
Publisher: Springer Science and Business Media LLC
Date: 03-2008
DOI: 10.1557/MRS2008.47
Abstract: Carbon nanotubes (CNTs) with macroscopically ordered structures (e.g., aligned or patterned mats, fibers, and sheets) and associated large surface areas have proven promising as new CNT electroactive polymer materials (CNT-EAPs) for the development of advanced chemical and biological sensors. The functionalization of CNTs with many biological species to gain specific surface characteristics and to facilitate electron transfer to and from them for chemical- and bio-sensing applications is an area of intense research activity. Mechanical actuation generated by CNT-EAPs is another exciting electroactive function provided by these versatile materials. Controlled mechanical deformation for actuation has been demonstrated in CNT mats, fibers, sheets, and in idual nanotubes. This article summarizes the current status and technological challenges for the development of electrochemical sensors and electromechanical actuators based on carbon nanotube electroactive materials.
Water-dispersible, sulfonated hyperbranched poly(ether-ketone) grafted multiwalled carbon nanotubes as oxygen reduction catalysts
Publisher: American Chemical Society (ACS)
Date: 19-06-2012
DOI: 10.1021/NN301863D
Abstract: To endorse sufficient water affinity to multiwalled carbon nanotubes (MWCNTs), dendritic hyperbranched poly(ether-ketone) (HPEK) was first covalently grafted to the surface of a MWCNT via a Friedel-Crafts acylation reaction. The resultant HPEK-grafted MWCNT (HPEK-g-MWCNT) was subsequently sulfonated in chlorosulfonic acid to produce sulfonated HPEK-g-MWCNT (SHPEK-g-MWCNT), which is dispersible well in water showing a zeta potential value of -57.8 mV. The SHPEK-g-MWCNT paper simply formed by filtration of aqueous dispersion has a sheet resistance as low as 63 Ω/sq. Its thin film shows a high electrocatalytic activity for oxygen reduction reaction (ORR). Thus, the newly produced water-dispersible MWCNT is a new class of high performance cathode material for ORR.
Edge-fluorinated graphene nanoplatelets as high performance electrodes for dye-sensitized solar cells and lithium ion batteries
Publisher: Wiley
Date: 08-01-2015
Scanning tunnelling microscopy of mesomorphic structures in soluble polyacetylenes
Publisher: Elsevier BV
Date: 04-1991
Recent advances in graphene quantum dots for fluorescence bioimaging from cells through tissues to animals
Publisher: Wiley
Date: 29-11-2015
Vertically-aligned carbon nanotubes infiltrated with temperature-responsive polymers: Smart nanocomposite films for self-cleaning and controlled release
Publisher: Royal Society of Chemistry (RSC)
Date: 2008
DOI: 10.1039/B715079B
Abstract: We have demonstrated that the infiltration of temperature-responsive polymers (e.g., PNIPAAm) into vertically-aligned carbon nanotube forests created synergetic effects, which provided the basis for the development of smart nanocomposite films with temperature-induced self-cleaning and/or controlled release capabilities.
Organic-inorganic hybrid light-emitting composites: poly(p-phenylene vinylene) intercalated clay nanoparticles
Publisher: Springer Science and Business Media LLC
Date: 1999
Layer-by-layer growth of CH3 NH3 Pbi3-x Clx for highly effi cient planar heterojunction perovskite solar cells
Publisher: Wiley
Date: 23-12-2015
Abstract: A layer-by-layer approach is developed to prepare uniform and compact CH₃NH₃PbI(3-x)Clx perovskite films for perovskite solar cells with a high efficiency up to 15.12% and an improved stability. Moreover, a record high efficiency of 12.25% is achieved for these flexible perovskite solar cells. This study represents an important step forward in developing high-performance and stable perovskite solar cells.
Charge transfer of carbon nanomaterials for efficient metal‐free electrocatalysis
Publisher: Wiley
Date: 2022
DOI: 10.1002/IDM2.12010
Abstract: Recently, carbon‐based metal‐free electrocatalysts (C‐MFECs) have drawn considerable research attention because of their attractive physicochemical characteristics, cost‐effectiveness, and ability to convert and store energy efficiently. Efficient intramolecular charge transfer among different parts of the carbon electrocatalyst and/or intermolecular charge transfer between electrocatalyst and electrolyte dictate the ultimate energy conversion performance. Experimental results and theoretical analyses have demonstrated that rational design of metal‐free carbon nanomaterials, coupled with proper intramolecular charge transfer through heteroatom doping, incorporation of Stone–Wales defects, and/or intermolecular charge transfer through adsorption of appropriate molecules/moieties, can promote efficient electrocatalysis. In this article, we will first provide the related theoretical principles and then present an overview on the rational design and development of C‐MFECs for efficient charge transfer, followed by elucidating charge‐transfer processes for different electrocatalytic reactions related to renewable energy conversion and environmental remediation technologies. Finally, the current challenges and future perspectives in this exciting field will be discussed.
Surface analysis of a well-aligned carbon nanotube film by positron-annihilation induced Auger-electron spectroscopy
Publisher: Elsevier BV
Date: 06-2002
N-doped graphene nanoribbons as efficient metal-free counter electrodes for disulfide/thiolate redox mediated DSSCs
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4NR06969B
Abstract: Nitrogen-doped graphene nanoribbons (N-GNRs) were prepared by thermal treatment of the as-zipped graphene oxide nanoribbon in NH 3 gas. The resultant N-GNRs were found to act as efficient metal-free counter electrodes in DSSCs.
Graphene Oxide Nanoribbon Assembly toward Moisture-Powered Information Storage
Publisher: Wiley
Date: 14-11-2017
Abstract: Moisture-powered potential switching is achieved by establishing ion channels and an oxygen-functional-group gradient in graphene oxide nanoribbon network assemblies. The resulting flexible membrane is used to fabricate breath-powered write-once-read-many-times-type memory devices with a remarkably low error risk (ON/OFF ratio of 10
Superior capacitive performance of aligned carbon nanotubes in ionic liquids
Publisher: The Electrochemical Society
Date: 27-05-2008
DOI: 10.1149/1.2943245
Abstract: Electrodes and electrolytes are two essential components of a supercapacitor and play important roles in determining the performance for the supercapacitor. In the present work, we investigated the electrochemical and capacitive behavior of aligned carbon nanotube electrodes in ionic liquid electrolytes to study the feasibility to develop high performance supercapacitors from these two components. Synthesis procedure of the carbon nanotubes and composition of the ionic liquids have been studied to achieve a high capacitance and fast charge/discharge process for the carbon nanotube electrode in the ionic liquid electrolyte.
In situ SEM observation of column-like and foam-like CNT array nanoindentation
Publisher: American Chemical Society (ACS)
Date: 02-03-2011
DOI: 10.1021/AM101262G
Abstract: Quantitative nanoindentation of nominally 7.5 and 600 μm tall vertically aligned carbon nanotube (VACNT) arrays is observed in situ within an SEM chamber. The 7.5 μm array consists of highly aligned and weakly interacting CNTs and deflects similarly to classically defined cylindrical columns, with deformation geometry and critical buckling force well estimated using the Euler-Bernoulli theory. The 600 μm array has a highly entangled foam-like morphology and exhibits sequential buckle formation upon loading, with a buckle first forming near the array bottom at approximately 2% strain, followed by accumulating coordinated buckling at the top surface at strains exceeding 5%.
Proton Capture Strategy for Enhancing Electrochemical CO2 Reduction on Atomically Dispersed Metal–Nitrogen Active Sites**
Publisher: Wiley
Date: 12-04-2021
Abstract: Electrocatalysts play a key role in accelerating the sluggish electrochemical CO 2 reduction (ECR) involving multi‐electron and proton transfer. We now develop a proton capture strategy by accelerating the water dissociation reaction catalyzed by transition‐metal nanoparticles (NPs) adjacent to atomically dispersed and nitrogen‐coordinated single nickel (Ni−N x ) active sites to accelerate proton transfer to the latter for boosting the intermediate protonation step, and thus the whole ECR process. Aberration‐corrected scanning transmission electron microscopy, X‐ray absorption spectroscopy, and calculations reveal that the Ni NPs accelerate the adsorbed H (H ad ) generation and transfer to the adjacent Ni−N x sites for boosting the intermediate protonation and the overall ECR processes. This proton capture strategy is universal to design and prepare for various high‐performance catalysts for erse electrochemical reactions even beyond ECR.
Mesh-on-Mesh Graphitic-C3N4@Graphene for Highly Efficient Hydrogen Evolution
Publisher: Wiley
Date: 10-03-2017
Facile and Scalable Preparation of Fluorescent Carbon Dots for Multifunctional Applications
Publisher: Elsevier BV
Date: 06-2017
Luminescent dendrons with oligo(phenylenevinylene) core branches and oligo(ethylene oxide) terminal chains
Publisher: American Chemical Society (ACS)
Date: 30-09-2005
DOI: 10.1021/MA0506233
A general polymer-assisted strategy enables unexpected efficient metal-free oxygen-evolution catalysis on pure carbon nanotubes
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7EE01702B
Abstract: A conceptually new and general polymer-assisted strategy was proposed to enable unexpected efficient metal-free oxygen-evolution catalysis on pure carbon nanotubes.
Graphene-Based Nanowire Supercapacitors
Publisher: American Chemical Society (ACS)
Date: 18-03-2014
DOI: 10.1021/LA500299S
Abstract: We present a new type of electrochemical supercapacitors based on graphene nanowires. Graphene oxide (GO) olypyrrole (PPy) nanowires are prepared via electrodepostion of GO/PPy composite into a micoroporous Al2O3 template, followed by the removal of template. PPy is electrochemically doped by oxygen-containing functional groups of the GO to enhance the charging/discharging rates of the supercapacitor. A high capacitance 960 F g(-1) of the GO/PPy nanowires is obtained due to the large surface area of the vertically aligned nanowires and the intimate contact between the nanowires and the substrate electrode. The capacitive performance remains stable after charging and discharging for 300 cycles. To improve the thermal stability and long-term charge storage, GO is further electrochemically reduced into graphene and PPy is subsequently thermally carbonized, leading to a high capacitance of 200 F g(-1) for the resultant pure reduced graphene oxide/carbon based nanowire supercapacitor. This value of capacitance (200 F g(-1)) is higher than that of conventional porous carbon materials while the reduced graphene oxide/carbon nanowires show a lower Faraday resistance and higher thermal stability than the GO/PPy nanowires.
Simulation analysis of ESR spectrum of polymer alkyl-C60 radicals formed by photoinitiated reactions of low-density polyethylene
Publisher: Springer Science and Business Media LLC
Date: 05-2000
DOI: 10.1007/BF03162261
Carbon nanotube dry adhesives with temperature-enhanced adhesion over a large temperature range
Publisher: Springer Science and Business Media LLC
Date: 16-11-2016
DOI: 10.1038/NCOMMS13450
Abstract: Conventional adhesives show a decrease in the adhesion force with increasing temperature due to thermally induced viscoelastic thinning and/or structural decomposition. Here, we report the counter-intuitive behaviour of carbon nanotube (CNT) dry adhesives that show a temperature-enhanced adhesion strength by over six-fold up to 143 N cm −2 (4 mm × 4 mm), among the strongest pure CNT dry adhesives, over a temperature range from −196 to 1,000 °C. This unusual adhesion behaviour leads to temperature-enhanced electrical and thermal transports, enabling the CNT dry adhesive for efficient electrical and thermal management when being used as a conductive double-sided sticky tape. With its intrinsic thermal stability, our CNT adhesive sustains many temperature transition cycles over a wide operation temperature range. We discover that a ‘nano-interlock’ adhesion mechanism is responsible for the adhesion behaviour, which could be applied to the development of various dry CNT adhesives with novel features.
Oxidizing metal ions with graphene oxide: the in situ formation of magnetic nanoparticles on self-reduced graphene sheets for multifunctional applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1CC14789G
Abstract: Fe(2+) cations in FeCl(2) or FeSO(4) were oxidized by graphene oxide, leading to an in situ deposition of Fe(3)O(4) nanoparticles onto the self-reduced graphene oxide (rGO) sheets. The resultant Fe(3)O(4)/rGO sheets were demonstrated to possess interesting magnetic and electrochemical properties attractive for a large variety of potential applications.
Direct nitrogen fixation at the edges of graphene nanoplatelets as efficient electrocatalysts for energy conversion
Publisher: Springer Science and Business Media LLC
Date: 23-07-2013
DOI: 10.1038/SREP02260
Vertically aligned carbon nanotube-sheathed carbon fibers as pristine microelectrodes for selective monitoring of ascorbate in vivo
Publisher: American Chemical Society (ACS)
Date: 28-03-2014
DOI: 10.1021/AC404232H
Abstract: Using as-synthesized vertically aligned carbon nanotube-sheathed carbon fibers (VACNT-CFs) as microelectrodes without any postsynthesis functionalization, we have developed in this study a new method for in vivo monitoring of ascorbate with high selectivity and reproducibility. The VACNT-CFs are formed via pyrolysis of iron phthalocyanine (FePc) on the carbon fiber support. After electrochemical pretreatment in 1.0 M NaOH solution, the pristine VACNT-CF microelectrodes exhibit typical microelectrode behavior with fast electron transfer kinetics for electrochemical oxidation of ascorbate and are useful for selective ascorbate monitoring even with other electroactive species (e.g., dopamine, uric acid, and 5-hydroxytryptamine) coexisting in rat brain. Pristine VACNT-CFs are further demonstrated to be a reliable and stable microelectrode for in vivo recording of the dynamic increase of ascorbate evoked by intracerebral infusion of glutamate. Use of a pristine VACNT-CF microelectrode can effectively avoid any manual electrode modification and is free from person-to-person and/or electrode-to-electrode deviations intrinsically associated with conventional CF electrode fabrication, which often involves electrode surface modification with randomly distributed CNTs or other pretreatments, and hence allows easy fabrication of highly selective, reproducible, and stable microelectrodes even by nonelectrochemists. Thus, this study offers a new and reliable platform for in vivo monitoring of neurochemicals (e.g., ascorbate) to largely facilitate future studies on the neurochemical processes involved in various physiological events.
Aligned coaxial nanowires of carbon nanotubes sheathed with conducting polymers
Publisher: Wiley
Date: 16-10-2000
DOI: 10.1002/1521-3773(20001016)39:20<3664::AID-ANIE3664>3.0.CO;2-Y
Controlled surface engineering and device fabrication of optoelectronic polymers and carbon nanotubes by plasma processes
Publisher: Wiley
Date: 12-05-2005
Functional Nanohybrids Constructed via Complexation of Multiwalled Carbon Nanotubes with Novel Hexameric Metallomacrocyles
Publisher: American Chemical Society (ACS)
Date: 18-07-2006
DOI: 10.1021/CM060510D
A photo-responsive bifunctional electrocatalyst for oxygen reduction and evolution reactions
Publisher: Elsevier BV
Date: 2018
Carbon-based catalysts for metal-free electrocatalysis
Publisher: Elsevier BV
Date: 08-2017
Unconventional Carbon: Alkaline Dehalogenation of Polymers Yields N-Doped Carbon Electrode for High-Performance Capacitive Energy Storage
Publisher: Wiley
Date: 29-03-2016
Impurity Tolerance of Unsaturated Ni-N-C Active Sites for Practical Electrochemical CO2 Reduction
Publisher: American Chemical Society (ACS)
Date: 09-02-2022
Carbon-Based Metal-Free Catalysts for Electrocatalysis beyond the ORR
Publisher: Wiley
Date: 27-07-2016
Abstract: Besides their use in fuel cells for energy conversion through the oxygen reduction reaction (ORR), carbon‐based metal‐free catalysts have also been demonstrated to be promising alternatives to noble‐metal/metal oxide catalysts for the oxygen evolution reaction (OER) in metal–air batteries for energy storage and for the splitting of water to produce hydrogen fuels through the hydrogen evolution reaction (HER). This Review focuses on recent progress in the development of carbon‐based metal‐free catalysts for the OER and HER, along with challenges and perspectives in the emerging field of metal‐free electrocatalysis.
Preparation and characterization of three dimensional graphene foam supported platinum–ruthenium bimetallic nanocatalysts for hydrogen peroxide based electrochemical biosensors
Publisher: Elsevier BV
Date: 02-2014
DOI: 10.1016/J.BIOS.2013.08.025
Abstract: The large surface, the excellent dispersion and the high degrees of sensitivity of bimetallic nanocatalysts were the attractive features of this investigation. Graphene foam (GF) was a three dimensional (3D) porous architecture consisting of extremely large surface and high conductive pathways. In this study, 3D GF was used incorporating platinum-ruthenium (PtRu) bimetallic nanoparticles as an electrochemical nanocatalyst for the detection of hydrogen peroxide (H2O2). PtRu/3D GF nanocatalyst exhibited a remarkable performance toward electrochemical oxidation of H2O2 without any additional mediator showing a high sensitivity (1023.1 µA mM(-1)cm(-2)) and a low detection limit (0.04 µM) for H2O2. Amperometric results demonstrated that GF provided a promising platform for the development of electrochemical sensors in biosensing and PtRu/3D GF nanocatalyst possessed the excellent catalytic activity toward the H2O2 detection. A small particle size and a high degree of the dispersion in obtaining of large active surface area were important for the nanocatalyst for the best H2O2 detection in biosensing. Moreover, potential interference by ascorbic acid and uric acid appeared to be negligible.
Modelling and simulations of adhesion between carbon nanotubes and surfaces
Publisher: Informa UK Limited
Date: 05-2009
Bioinspired Surfaces I: Gecko-Foot Mimetic Adhesion
Publisher: Wiley
Date: 05-12-2012
Interfacial aspects of carbon composites
Publisher: Informa UK Limited
Date: 26-03-2018
PVK-modified single-walled carbon nanotubes with effective photoinduced electron transfer
Publisher: American Chemical Society (ACS)
Date: 24-07-2003
DOI: 10.1021/MA034513C
Gecko-foot-mimetic aligned single-walled carbon nanotube dry adhesives with unique electrical and thermal properties
Publisher: Wiley
Date: 19-11-2007
Recent Advances in Fiber‐Shaped Supercapacitors and Lithium‐Ion Batteries
Publisher: Wiley
Date: 09-09-2019
Abstract: The rapid development in wearable electronics has spurred a great deal of interest in flexible energy storage devices, particularly fiber-shaped energy storage devices (FSESDs), such as fiber-shaped supercapacitors (FSSCs) and fiber-shaped batteries (FSBs). Depending on their electrode configurations, FSESDs can contain five differently structured electrodes, including parallel fiber electrodes (PFEs), twisted fiber electrodes (TFDs), wrapped fiber electrodes (WFEs), coaxial fiber devices (CFEs), and rolled electrodes (REs). Various rational methods have been devised to incorporate these fiber-shaped electrodes into multifunctional FSESDs, including fiber-shaped supercapacitors, lithium-ion batteries, lithium-sulfur batteries, lithium-air batteries, zinc-air batteries, and aluminum-air batteries. Although significant progress has been made in FSESDs, it remains a major challenge to make high-performance fiber-shaped devices at low cost. A focused and critical review of the recent advancements in fiber-shaped supercapacitors and lithium-ion batteries is provided here. The pros and cons for each of the aforementioned electrode configurations and FSESDs are discussed, along with current challenges and future opportunities for FSESDs.
Direct measurements of the interaction between pyrene and graphite in aqueous media by single molecule force spectroscopy: Understanding the π-π interactions
Publisher: American Chemical Society (ACS)
Date: 23-06-2007
DOI: 10.1021/LA700876D
Abstract: Pyrene derivatives can absorb onto the surface of carbon nanotubes and graphite particles through pi-pi interactions to functionalize these inorganic building blocks with organic surface moieties. Using single molecule force spectroscopy, we have demonstrated the first direct measurement of the interaction between pyrene and a graphite surface. In particular, we have connected a pyrene molecule onto an AFM tip via a flexible poly(ethylene glycol) (PEG) chain to ensure the formation of a molecular bridge. The pi-pi interaction between pyrene and graphite is thus indicated to be approximately 55 pN with no hysteresis between the desorption and adhesion forces.
Layered graphene/quantum dots: Nanoassemblies for highly efficient solar cells
Publisher: Wiley
Date: 28-05-2010
Controlled removal of individual carbon nanotubes from vertically aligned arrays for advanced nanoelectrodes
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0JM00071J
Light-controlled single-walled carbon nanotube dispersions in aqueous solution
Publisher: American Chemical Society (ACS)
Date: 02-08-2008
DOI: 10.1021/LA8020063
Abstract: We have succeeded in dispersing single-walled carbon nanotubes (SWNTs) into an aqueous solution of poly(ethylene glycol)-terminated malachite green derivative (PEG-MG) through simple sonication. It was found that UV exposure caused reaggregation of these predispersed SWNTs in the same aqueous medium, as adsorbed PEG-MG photochromic chains could be effectively photocleavaged from the nanotube surface. The observed light-controlled dispersion and reaggragation of SWNTs in the aqueous solution should facilitate the development of SWNT dispersions with a controllable dispersity for potential applications.
High performance electrochemical capacitors from aligned carbon nanotube electrodes and ionic liquid electrolytes
Publisher: Elsevier BV
Date: 04-2009
C60 modified single-walled carbon nanotubes
Publisher: Elsevier BV
Date: 08-2003
Vertically aligned N-doped coral-like carbon fiber arrays as efficient air electrodes for high-performance nonaqueous Li-O2 batteries
Publisher: American Chemical Society (ACS)
Date: 03-03-2014
DOI: 10.1021/NN500327P
Abstract: High energy efficiency and long cycleability are two important performance measures for Li-air batteries. Using a rationally designed oxygen electrode based on a vertically aligned nitrogen-doped coral-like carbon nanofiber (VA-NCCF) array supported by stainless steel cloth, we have developed a nonaqueous Li-O2 battery with an energy efficiency as high as 90% and a narrow voltage gap of 0.3 V between discharge/charge plateaus. Excellent reversibility and cycleability were also demonstrated for the newly developed oxygen electrode. The observed outstanding performance can be attributed to its unique vertically aligned, coral-like N-doped carbon microstructure with a high catalytic activity and an optimized oxygen/electron transportation capability, coupled with the microporous stainless steel substrate. These results demonstrate that highly efficient and reversible Li-O2 batteries are feasible by using a rationally designed carbon-based oxygen electrode.
Three‐Dimensional Graphene Bimetallic Nanocatalysts Foam for Energy Storage and Biosensing
Publisher: Wiley
Date: 07-04-2015
Aggregation in conducting copolymer solutions
Publisher: Wiley
Date: 1993
<title>Electrochemically driven actuators from conducting polymers, hydrogels, and carbon nanotubes</title>
Publisher: SPIE
Date: 06-04-2001
DOI: 10.1117/12.424410
A Fast Radio Burst Discovered in FAST Drift Scan Survey
Publisher: American Astronomical Society
Date: 18-05-2020
Newly-Designed Complex Ternary Pt/PdCu Nanoboxes Anchored on Three-Dimensional Graphene Framework for Highly Efficient Ethanol Oxidation
Publisher: Wiley
Date: 10-08-2012
Abstract: Newly-designed ternary Pt/PdCu nanoboxes on three-dimensional graphene framework (Pt/PdCu/3DGF) have been fabricated via a dual solvothermal strategy. This structurally well-defined Pt/PdCu/3DGF system possesses an approximately 4-fold improvement in catalytic activity for ethanol oxidation in alkaline media over the commercial 20% Pt/C catalyst as normalized by the total mass of active metals, showing the great potential for direct fuel cell applications.
Conjugated and fullerene-containing polymers for electronic and photonic applications: Advanced syntheses and microlithographic fabrications
Publisher: Informa UK Limited
Date: 18-05-1999
DOI: 10.1081/MC-100101421
Conducting-Polymer Microcontainers: Controlled Syntheses and Potential Applications
Publisher: Wiley
Date: 02-2004
A metal-free bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions
Publisher: Springer Science and Business Media LLC
Date: 06-04-2015
Abstract: The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are traditionally carried out with noble metals (such as Pt) and metal oxides (such as RuO₂ and MnO₂) as catalysts, respectively. However, these metal-based catalysts often suffer from multiple disadvantages, including high cost, low selectivity, poor stability and detrimental environmental effects. Here, we describe a mesoporous carbon foam co-doped with nitrogen and phosphorus that has a large surface area of ∼1,663 m(2) g(-1) and good electrocatalytic properties for both ORR and OER. This material was fabricated using a scalable, one-step process involving the pyrolysis of a polyaniline aerogel synthesized in the presence of phytic acid. We then tested the suitability of this N,P-doped carbon foam as an air electrode for primary and rechargeable Zn-air batteries. Primary batteries demonstrated an open-circuit potential of 1.48 V, a specific capacity of 735 mAh gZn(-1) (corresponding to an energy density of 835 Wh kgZn(-1)), a peak power density of 55 mW cm(-2), and stable operation for 240 h after mechanical recharging. Two-electrode rechargeable batteries could be cycled stably for 180 cycles at 2 mA cm(-2). We also examine the activity of our carbon foam for both OER and ORR independently, in a three-electrode configuration, and discuss ways in which the Zn-air battery can be further improved. Finally, our density functional theory calculations reveal that the N,P co-doping and graphene edge effects are essential for the bifunctional electrocatalytic activity of our material.
Hole-punching for enhancing electrocatalytic activities of 2D graphene electrodes: Less is more
Publisher: AIP Publishing
Date: 17-08-2020
DOI: 10.1063/5.0012709
Abstract: Using a polymer-masking approach, we have developed metal-free 2D carbon electrocatalysts based on single-layer graphene with and without punched holes and/or N-doping. A combined experimental and theoretical study on the resultant 2D graphene electrodes revealed that a single-layer graphene sheet exhibited a significantly higher electrocatalytic activity at its edge than that over the surface of its basal plane. Furthermore, the electrocatalytic activity of a single-layer 2D graphene sheet was significantly enhanced by simply punching microholes through the graphene electrode due to the increased edge population for the hole-punched graphene electrode. In a good consistency with the experimental observations, our density function theory calculations confirmed that the introduction of holes into a graphene sheet generated additional positive charge along the edge of the punched holes and hence the creation of more highly active sites for the oxygen reduction reaction. The demonstrated concept for less graphene material to be more electrocatalytically active shed light on the rational design of low-cost, but efficient electrocatalysts from 2D graphene for various potential applications ranging from electrochemical sensing to energy conversion and storage.
Coming up for Air: Breathing Air with Metal for Energy Storage
Publisher: Wiley
Date: 18-10-2019
Heteroatom-Doped Carbon Nanotubes as Advanced Electrocatalysts for Oxygen Reduction Reaction
Publisher: Wiley
Date: 25-09-2015
Effects of MWNT nanofillers on structures and properties of PVA electrospun nanofibres
Publisher: IOP Publishing
Date: 04-05-2007
Nitrogen-doped holey graphitic carbon from 2D covalent organic polymers for oxygen reduction
Publisher: Wiley
Date: 24-03-2014
Abstract: Using covalent organic polymer pre-cursors, we have developed a new strategy for location control of N-dopant heteroatoms in the graphitic porous carbon, which otherwise is impossible to achieve with conventional N-doping techniques. The electrocatalytic activities of the N-doped holey graphene analogues are well correlated to the N-locations, showing possibility for tailoring the structure and property of N-doped carbon nanomaterials.
Scalable preparation of multifunctional fire-retardant ultralight graphene foams
Publisher: American Chemical Society (ACS)
Date: 13-01-2016
Abstract: Traditional flame-retardant materials often show poor tolerance to oxidants, strong acidic/alkaline reagents, organic solvents, along with toxicity problems. Herein, highly fire-retardant ultralight graphene foam has been developed, which possesses not only ultralight and compressible characteristics but also efficient flame-retardant properties, outperforming those traditional polymer, metallic oxide, and metal hydroxide based flame retardant materials and their composites. The newly developed unconventional refractory materials are promising for specific applications as demonstrated by the observed high temperature resistant microwave absorption capability.
Carbon-nanotube electron emitters for display applications
Publisher: Wiley
Date: 2005
DOI: 10.1889/1.2080507
Controlled Syntheses of Aligned Multi-Walled Carbon Nanotubes: Catalyst Particle Size and Density Control via Layer-by-Layer Assembling
Publisher: American Chemical Society (ACS)
Date: 25-11-2005
DOI: 10.1021/CM051512L
Pyrazino[2,3-g]quinoxaline-based conjugated copolymers with indolocarbazole coplanar moieties designed for efficient photovoltaic applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1JM10433K
Heteroatom-doped carbon catalysts for zinc–air batteries: progress, mechanism, and opportunities
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0EE02800B
Abstract: This review presents the recent progress in advanced bifunctional heteroatom-doped carbon catalysts for rechargeable aqueous and all-solid-state Zn–air batteries, along with current challenges and future perspectives in the field.
The edge- and basal-plane-specific electrochemistry of a single-layer graphene sheet
Publisher: Springer Science and Business Media LLC
Date: 30-07-2013
DOI: 10.1038/SREP02248
Selective adsorption of nitro-substituted aromatics and accelerated hydrolysis of 4-nitrophenyl acetate on carbon surfaces
Publisher: Royal Society of Chemistry (RSC)
Date: 2001
DOI: 10.1039/B101963P
Polymer composites with high haze and high transmittance
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5PY01072A
Abstract: Novel light scattering polymer composites with high transmittance and high haze have been developed by using cross-linked copolymer (CM-SMC) microspheres as light scattering fillers.
Power generation with laterally packaged piezoelectric fine wires
Publisher: Springer Science and Business Media LLC
Date: 09-11-2009
Abstract: Converting mechanical energy into electricity could have applications in sensing, medical science, defence technology and personal electronics, and the ability of nanowires to 'scavenge' energy from ambient and environmental sources could prove useful for powering nanodevices. Previously reported nanowire generators were based on vertically aligned piezoelectric nanowires that were attached to a substrate at one end and free to move at the other. However, there were problems with the output stability, mechanical robustness, lifetime and environmental adaptability of such devices. Here we report a flexible power generator that is based on cyclic stretching-releasing of a piezoelectric fine wire that is firmly attached to metal electrodes at both ends, is packaged on a flexible substrate, and does not involve sliding contacts. Repeatedly stretching and releasing a single wire with a strain of 0.05-0.1% creates an oscillating output voltage of up to approximately 50 mV, and the energy conversion efficiency of the wire can be as high as 6.8%.
Bionic Mineralization toward Scalable MOF Films for Ampere-Level Biomass Upgrading
Publisher: American Chemical Society (ACS)
Date: 11-09-2023
DOI: 10.1021/JACS.3C07790
Graphene phosphonic acid as an efficient flame retardant
Publisher: American Chemical Society (ACS)
Date: 04-03-2014
DOI: 10.1021/NN4066395
Abstract: We report the preparation of graphene phosphonic acid (GPA) via a simple and versatile method and its use as an efficient flame retardant. In order to covalently attach phosphorus to the edges of graphene nanoplatelets, graphite was ball-milled with red phosphorus. The cleavage of graphitic C-C bonds during mechanochemical ball-milling generates reactive carbon species, which react with phosphorus in a sealed ball-mill crusher to form graphene phosphorus. Subsequent opening of the crusher in air moisture leads to violent oxidation of graphene phosphorus into GPA (highest oxidation state). The GPA is readily dispersible in many polar solvents, including neutral water, allowing for solution (spray) coating for high-performance, nontoxic flame-retardant applications.
Ionochromism in a light-emitting electrochemical cell with low response time based on an ionic conductive poly-phenylene vinylene
Publisher: AIP Publishing
Date: 04-10-1999
DOI: 10.1063/1.124900
Abstract: Characterizations of red-orange light-emitting electrochemical cells (LECs) based on poly[1,4-(2,5-bis(1,4,7,10-tetraoxaundecyl))phenylene vinylene], (BTEM-PPV), are presented, BTEM-PPV combines good electronic conductivity with ionic conductivity due to its conjugated backbone and side chains consisting of oligo(ethylene oxide). The use of this polymer in LECs leads to relatively bright light emitting devices with low response times which are obtained without blending an additional ionic conductive polymer into the film. The response times of the BTEM-LECs driven with a square wave form pulse were determined to be about 480 μs. The value for the turn-on voltage of the electroluminescence is 2 V and at 3 V a brightness of around 35 cd/m2 was obtained. BTEM-PPV complexed with metal ions shows an ionochromic effect in the absorption spectrum and also in the electroluminescence spectrum due to the covalent linkage of the glymelike side chains to the PPV backbone, which represents an approach toward chemical sensors.
Bifunctional Catalysts for Metal‐Air Batteries
Publisher: Wiley
Date: 04-2019
Vapor-Activated Power Generation on Conductive Polymer
Publisher: Wiley
Date: 28-10-2016
Plasma polymerization and microfabrication of electroactive polymers and carbon nanotubes
Publisher: SPIE
Date: 06-04-2001
DOI: 10.1117/12.424406
Toxicity testing of nanomaterials
Publisher: Springer US
Date: 2012
DOI: 10.1007/978-1-4614-3055-1_5
Abstract: The large-scale production and consumer exposure to a variety of nanotechnology innovations has stirred interest concerning the health consequences of human exposure to nanomaterials. In order to investigate these questions, in vitro systems are used to rapidly and inexpensively predict the effects of nanomaterials at the cellular level. Recent advances in the toxicity testing of nanomaterials are beginning to shed light on the characteristics, uptake and mechanisms of their toxicity in a variety of cell types. Once the nanomaterials have been satisfactorily characterized, the evaluation of their interactions with cells can be studied with microscopy and biochemical assays. The combination of viability testing, observation of morphology and the generation of oxidative stress provide clues to the mechanisms of nanomaterial toxicity. The results of these studies are used to better understand how the size, chemical composition, shape and functionalization may contribute to their toxicity. This chapter will introduce the reader to the impact of nanomaterials in the workplace and marketplace with an emphasis on carbon-based and metal-based nanomaterials, which are most commonly encountered. While most purified carbon nanomaterials were nontoxic to many cell lines, many metal nanoparticles (e.g., silver or manganese) were more toxic. Other side- effects of nanoparticle interactions with cells can also occur, such as increased branching and dopamine depletion. Further investigation into the characteristics, uptake and mechanisms of nanomaterial toxicity will continue to elucidate this fascinating and rapidly growing area of science.
Determination of alanine aminotransferase with an electrochemical nano Ir-C biosensor for the screening of liver diseases
Publisher: MDPI AG
Date: 12-07-2011
DOI: 10.3390/BIOS1030107
A repeating fast radio burst associated with a persistent radio source
Publisher: Springer Science and Business Media LLC
Date: 08-06-2022
DOI: 10.1038/S41586-022-04755-5
Abstract: The dispersive sweep of fast radio bursts (FRBs) has been used to probe the ionized baryon content of the intergalactic medium 1 , which is assumed to dominate the total extragalactic dispersion. Although the host-galaxy contributions to the dispersion measure appear to be small for most FRBs 2 , in at least one case there is evidence for an extreme magneto-ionic local environment 3,4 and a compact persistent radio source 5 . Here we report the detection and localization of the repeating FRB 20190520B, which is co-located with a compact, persistent radio source and associated with a dwarf host galaxy of high specific-star-formation rate at a redshift of 0.241 ± 0.001. The estimated host-galaxy dispersion measure of approximately $${903}_{-111}^{+72}$$ 903 − 111 + 72 parsecs per cubic centimetre, which is nearly an order of magnitude higher than the average of FRB host galaxies 2,6 , far exceeds the dispersion-measure contribution of the intergalactic medium. Caution is thus warranted in inferring redshifts for FRBs without accurate host-galaxy identifications.
Light-emitting polymers and carbon nanotube electron emitters for optoelectronic displays
Publisher: IOP Publishing
Date: 13-09-2002
DNA damage in embryonic stem cells caused by nanodiamonds
Publisher: American Chemical Society (ACS)
Date: 03-03-2011
DOI: 10.1021/NN200279K
Abstract: Because of their unique photoluminescence and magnetic properties, nanodiamonds (NDs) are promising for biomedical imaging and therapeutical applications. However, these biomedical applications will hardly be realized unless the potential hazards of NDs to humans and other biological systems are ascertained. Previous studies performed in our group and others have demonstrated the excellent biocompatibility of NDs in a variety of cell lines without noticeable cytotoxicity. In the present paper, we report the first genotoxicity study on NDs. Our results showed that incubation of embryonic stem cells with NDs led to slightly increased expression of DNA repair proteins, such as p53 and MOGG-1. Oxidized nanodiamonds (O-NDs) were demonstrated to cause more DNA damage than the pristine/raw NDs (R-NDs), showing the surface chemistry specific genotoxicity. However, the DNA damages caused by either the O-NDs or the R-NDs are much less severe than those caused by multiwalled carbon nanotubes (MWNTs) observed in our previous study. These findings should have important implications for future applications of NDs in biological applications.
Shape/size-controlled syntheses of metal nanoparticles for site-selective modification of carbon nanotubes
Publisher: American Chemical Society (ACS)
Date: 31-03-2006
DOI: 10.1021/JA060296U
Abstract: Shape- and size-controlled syntheses of metal nanoparticles have been achieved by galvanic displacement reaction between an aqueous solution of metal salt and Cu foil substrate. In particular, cubic and spheric nanoparticles of Pt (Au) with a fairly narrow size distribution were produced by reacting K(2)PtCl(4) (HAuCl(4)) with a Cu foil in an aqueous medium with and without CuCl(2) under different reaction conditions (e.g., different concentrations and reaction times). In conjunction with the substrate-enhanced electroless deposition (SEED) technique (Qu, L. Dai, L. J. Am. Chem. Soc. 2005, 127, 10806), the shape/size-controlled syntheses have been successfully exploited to site-selectively deposit these metal nanoparticles onto the outerwall, innerwall, or end-tip of carbon nanotubes (CNTs). Asymmetric sidewall modification by attaching the innerwall and outerwall of CNTs with metal nanoparticles of different shapes was also achieved. Furthermore, it was demonstrated that the nanotube-supported Pt nanoparticles could be converted into hollow Au nanoboxes by galvanic displacement of Pt with Au. These CNT-supported metal nanoparticles were shown to possess interesting optical and electrocatalytic properties.
Nature-inspired light-harvesting liquid crystalline porphyrins for organic photovoltaics
Publisher: Informa UK Limited
Date: 03-2008
Organo-soluble photoresponsive azo thiol monolayer-protected gold nanorods
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B901826C
Abstract: Organo-soluble photoresponsive azo thiol monolayer-protected gold nanorods were synthesized the resulting gold nanorods encapsulated by thiols on their entire surface with strong covalent Au-S linkages were very stable in both organic solvents and in the solid state without aggregation or decomposition.
Preferential syntheses of semiconducting vertically aligned single-walled carbon nanotubes for direct use in FETs
Publisher: American Chemical Society (ACS)
Date: 30-07-2008
DOI: 10.1021/NL800967N
Abstract: We have combined fast heating with plasma enhanced chemical vapor deposition (PECVD) for preferential growth of semiconducting vertically aligned single-walled carbon nanotubes (VA-SWNTs). Raman spectroscopic estimation indicated a high yield of up to 96% semiconducting SWNTs in the VA-SWNT array. The as-synthesized semiconducting SWNTs can be used directly for fabricating FET devices without the need for any postsynthesis purification or separation.
3D Vertically Aligned CNT/Graphene Hybrids from Layer‐by‐Layer Transfer for Supercapacitors
Publisher: Wiley
Date: 25-07-2017
Scalable synthesis of hierarchically structured carbon nanotube–graphene fibres for capacitive energy storage
Publisher: Springer Science and Business Media LLC
Date: 11-05-2014
Abstract: Micro-supercapacitors are promising energy storage devices that can complement or even replace batteries in miniaturized portable electronics and microelectromechanical systems. Their main limitation, however, is the low volumetric energy density when compared with batteries. Here, we describe a hierarchically structured carbon microfibre made of an interconnected network of aligned single-walled carbon nanotubes with interposed nitrogen-doped reduced graphene oxide sheets. The nanomaterials form mesoporous structures of large specific surface area (396 m(2) g(-1)) and high electrical conductivity (102 S cm(-1)). We develop a scalable method to continuously produce the fibres using a silica capillary column functioning as a hydrothermal microreactor. The resultant fibres show a specific volumetric capacity as high as 305 F cm(-3) in sulphuric acid (measured at 73.5 mA cm(-3) in a three-electrode cell) or 300 F cm(-3) in polyvinyl alcohol (PVA)/H(3)PO(4) electrolyte (measured at 26.7 mA cm(-3) in a two-electrode cell). A full micro-supercapacitor with PVA/H(3)PO(4) gel electrolyte, free from binder, current collector and separator, has a volumetric energy density of ∼6.3 mWh cm(-3) (a value comparable to that of 4 V-500 µAh thin-film lithium batteries) while maintaining a power density more than two orders of magnitude higher than that of batteries, as well as a long cycle life. To demonstrate that our fibre-based, all-solid-state micro-supercapacitors can be easily integrated into miniaturized flexible devices, we use them to power an ultraviolet photodetector and a light-emitting diode.
Metal-free photo- and electro-catalysts for hydrogen evolution reaction
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA08704A
Abstract: Hydrogen production as very attractive clean energy technology has sparked the accelerated development of catalysts for the hydrogen evolution reaction (HER) towards efficient photo- and electrolytic water splitting.
Edge-rich and dopant-free graphene as a highly efficient metal-free electrocatalyst for the oxygen reduction reaction
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5CC09173J
Abstract: An edge-rich and dopant-free ORR electrocatalyst was designed by the plasma etching strategy and the as-designed catalyst shows a one-step and four-electron pathway.
Voltage-induced incandescent light emission from large-area graphene films
Publisher: AIP Publishing
Date: 05-04-2010
DOI: 10.1063/1.3383221
Abstract: Voltage-induced incandescent light emission from large-area graphene films was demonstrated. Stable, bright, and uniform incandescent emission with a low turn-on voltage (∼6 V) was obtained for a free-standing graphene film (0.5×1 cm2) under appropriate vacuum (0.05 Torr) or Ar protection. The emission spectra fit well to the blackbody emission model with the emission intensity being exponentially proportional to the external voltage and inversely proportional to the gas pressure. Our results indicate great promise of graphene-based incandescent emitters for flat-lighting applications.
Sublayer-enhanced atomic sites of single atom catalysts through in situ atomization of metal oxide nanoparticles
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1EE03311E
Abstract: The in situ atomization of carbon supported metal oxide nanoparticles provides a novel strategy to synthesize atomic sites supported on highly graphitized carbon materials with high metal loading and controlled atomic layers.
Length dependent foam-like mechanical response of axially indented vertically oriented carbon nanotube arrays
Publisher: Elsevier BV
Date: 02-2011
Facile, scalable synthesis of edge-halogenated graphene nanoplatelets as efficient metal-free eletrocatalysts for oxygen reduction reaction
Publisher: Springer Science and Business Media LLC
Date: 05-06-2013
DOI: 10.1038/SREP01810
Charge Transfer Complex of TTF‐Carbon Nanotubes
Publisher: Informa UK Limited
Date: 06-2003
Two-birds-one-stone: multifunctional supercapacitors beyond traditional energy storage
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0EE03167D
Abstract: A comprehensive overview on the recent progress of multifunctional supercapacitors which combine energy storage capability with other functions.
Luminescent amphiphilic dendrimers with oligo(p-phenylene vinylene) core branches and oligo(ethylene oxide) terminal chains: Syntheses and stimuli-responsive properties
Publisher: Royal Society of Chemistry (RSC)
Date: 2007
DOI: 10.1039/B613278B
Water-assisted growth of aligned carbon nanotube-ZnO heterojunction arrays
Publisher: Wiley
Date: 04-07-2006
Donor-π-acceptor conjugated copolymers for photovoltaic applications: Tuning the open-circuit voltage by adjusting the donor/acceptor ratio
Publisher: American Chemical Society (ACS)
Date: 19-02-2008
DOI: 10.1021/JP7105428
Abstract: A class of new conjugated copolymers containing a donor (thiophene)-acceptor (2-pyran-4-ylidene-malononitrile) was synthesized via Stille coupling polymerization. The resulting copolymers were characterized by 1H NMR, elemental analysis, GPC, TGA, and DSC. UV-vis spectra indicated that the increase in the content of the thiophene units increased the interaction between the polymer main chains to cause a red-shift in the optical absorbance. Cyclic voltammetry was used to estimate the energy levels of the lowest unoccupied molecular orbital (LUMO) and the highest occupied molecular orbital (HOMO) and the band gap (Eg) of the copolymers. The basic electronic structures of the copolymers were also studied by DFT calculations with the GGA/B3LYP function. Both the experimental and the calculated results indicated an increase in the HOMO energy level with increasing the content of thiophene units, whereas the corresponding change in the LUMO energy level was much smaller. Polymer photovoltaic cells of a bulk heterojunction were fabricated with the structure of ITO/PEDOT/PSS (30 nm)/copolymer-PCBM blend (70 nm)/Ca (8 nm)/Al (140 nm). It was found that the open-circuit voltage (Voc) increased (up to 0.93 V) with a decrease in the content of thiophene units. Although the observed power convention efficiency is still relatively low (up to 0.9%), the corresponding low fill factor (0.29) indicates considerable room for further improvement in the device performance. These results provided a novel concept for developing high Voc photovoltaic cells based on donor-pi-acceptor conjugated copolymers by adjusting the donor/acceptor ratio.
Patterned growth of well-aligned carbon nanotubes: A photolithographic approach [3]
Publisher: American Chemical Society (ACS)
Date: 23-10-1999
DOI: 10.1021/JA992945Q
End-Adsorbed Triblock Copolymer Chains at the Liquid-Solid Interface: Bridging Effects in a Good Solvent
Publisher: American Chemical Society (ACS)
Date: 10-1992
DOI: 10.1021/MA00048A022
Conjugated polymers for light-emitting applications
Publisher: Wiley
Date: 07-2001
DOI: 10.1002/1521-4095(200107)13:12/13<915::AID-ADMA915>3.0.CO;2-N
Nanoscale aggregation of fullerene in Nafion membrane
Publisher: American Chemical Society (ACS)
Date: 17-10-2002
DOI: 10.1021/LA0259454
Large clusters and hollow microfibers by multicomponent self-assembly of citrate stabilized gold nanoparticles with temperature-responsive amphiphilic dendrimers
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM31273E
Three dimensional graphene foam supported platinum–ruthenium bimetallic nanocatalysts for direct methanol and direct ethanol fuel cell applications
Publisher: Elsevier BV
Date: 06-2014
Directional water-transfer through fabrics induced by asymmetric wettability
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0JM02364G
Functionalization of graphene for efficient energy conversion and storage
Publisher: American Chemical Society (ACS)
Date: 03-10-2013
DOI: 10.1021/AR300122M
Abstract: As global energy consumption accelerates at an alarming rate, the development of clean and renewable energy conversion and storage systems has become more important than ever. Although the efficiency of energy conversion and storage devices depends on a variety of factors, their overall performance strongly relies on the structure and properties of the component materials. Nanotechnology has opened up new frontiers in materials science and engineering to meet this challenge by creating new materials, particularly carbon nanomaterials, for efficient energy conversion and storage. As a building block for carbon materials of all other dimensionalities (such as 0D buckyball, 1D nanotube, 3D graphite), the two-dimensional (2D) single atomic carbon sheet of graphene has emerged as an attractive candidate for energy applications due to its unique structure and properties. Like other materials, however, a graphene-based material that possesses desirable bulk properties rarely features the surface characteristics required for certain specific applications. Therefore, surface functionalization is essential, and researchers have devised various covalent and noncovalent chemistries for making graphene materials with the bulk and surface properties needed for efficient energy conversion and storage. In this Account, I summarize some of our new ideas and strategies for the controlled functionalization of graphene for the development of efficient energy conversion and storage devices, such as solar cells, fuel cells, supercapacitors, and batteries. The dangling bonds at the edge of graphene can be used for the covalent attachment of various chemical moieties while the graphene basal plane can be modified via either covalent or noncovalent functionalization. The asymmetric functionalization of the two opposite surfaces of in idual graphene sheets with different moieties can lead to the self-assembly of graphene sheets into hierarchically structured materials. Judicious application of these site-selective reactions to graphene sheets has opened up a rich field of graphene-based energy materials with enhanced performance in energy conversion and storage. These results reveal the versatility of surface functionalization for making sophisticated graphene materials for energy applications. Even though many covalent and noncovalent functionalization methods have already been reported, vast opportunities remain for developing novel graphene materials for highly efficient energy conversion and storage systems.
Large-scale self-assembly of dispersed nanodiamonds
Publisher: Royal Society of Chemistry (RSC)
Date: 2008
DOI: 10.1039/B716676A
One-step coating of fluoro-containing silicananoparticles for universal generation of surface superhydrophobicity
Publisher: Royal Society of Chemistry (RSC)
Date: 2008
DOI: 10.1039/B714352D
Abstract: Stable superhydrophobic surfaces with water contact angles over 170 degrees and sliding angles below 7 degrees were produced by simply coating a particulate silica sol solution of co-hydrolysed TEOS/fluorinated alkyl silane with NH(3).H(2)O on various substrates, including textile fabrics (e.g. polyester, wool and cotton), electrospun nanofibre mats, filter papers, glass slides, and silicon wafers.
Carbon-based metal-free catalysts
Publisher: Springer Science and Business Media LLC
Date: 13-09-2016
Graphene oxide derivatives as hole- and electron-extraction layers for high-performance polymer solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3EE42963F
Nanodiamond/Polyimide High Temperature Dielectric Films for Energy Storage Applications
Publisher: Trans Tech Publications, Ltd.
Date: 09-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.785-786.410
Abstract: CP2 polyimide (prepd. from 6FDA and 1,3-bis (3-aminophenoxy) benzene) was blended with (1-50 wt.%) detonation nanodiamonds (DND, pristine, acetone-washed, and 4-(2,4,6-trimethylphenoxy) benzoic acid-functionalized), and the blends were evaluated as thin films for its potential utility in high-energy-density capacitors that would have stable dielectric properties over a wide temperature range (-55 to 300°C) and at frequencies up to or greater than 100 kHz. Both the dielectric storage and loss increased substantially with DND content. Surface functionalization (with the above benzoic acid derivative) significantly reduced the dielectric loss, while the use of acetone-washed DNDs had no effect on the dielectric loss. DND was also blended with CP2 via in-situ polymerization and found to have little effect on the dielectric properties.
Recent Advances in Carbon‐Based Metal‐Free Electrocatalysts
Publisher: Wiley
Date: 20-02-2019
Abstract: Precious noble metals (such as Pt, Ir) and nonprecious transition metals (e.g., Fe, Co), including their compounds (e.g., oxides, nitrides), have been widely investigated as efficient catalysts for energy conversion, energy storage, important chemical productions, and many industrial processes. However, they often suffer from high cost, low selectivity, poor durability, and susceptibility to gas poisoning with adverse environmental issues. As a low-cost alternative, the first carbon-based metal-free catalyst (C-MFC based on N-doped carbon nanotubes) was discovered in 2009. Since then, various C-MFCs have been demonstrated to show similar or even better catalytic performance than their metal-based counterparts, attractive energy conversion and storage (e.g., fuel cells, metal-air batteries, water splitting), environmental remediation, and chemical production. Enormous progress has been achieved while the number of publications still rapidly increases every year. Herein, a critical overview of the very recent advances in this rapidly developing field during the last couple of years is presented.
High-yield exfoliation of three-dimensional graphite into two-dimensional graphene-like sheets
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0CC00753F
Abstract: Edge-functionalized graphite (EFG) is prepared via a "direct" covalent attachment of organic molecular wedges. The EFG is dispersed in N-methyl-2-pyrrolidone with a concentration as high as 0.27 mg mL(-1), leading to high-yield exfoliation of the three-dimensional graphite into two-dimensional graphene-like sheets.
On-Chip Microsupercapacitors Based on Coordination Polymer Frameworks for Alternating Current Line-Filtering
Publisher: Wiley
Date: 11-04-2017
Abstract: AC line-filtering on-chip micro-supercapacitors (MSCs) based on coordination polymer frameworks were fabricated by a facile layer-by-layer method. The reported on-chip MSCs showed a low impedance phase angle of -73° at 120 Hz and a high power density of up to 1323 W cm
Efficient dispersion of singlewalled carbon nanotubes by novel amphiphilic dendrimers in water and substitution of the pre-adsorbed dendrimers with conventional surfactants and lipids
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0CC02833A
Abstract: A new class of hiphilic dendrimers, which can be readily adsorbed on the surface of singlewalled carbon nanotubes (SWNTs) to improve their dispersibility in aqueous medium, were synthesized. The adsorbed dendrimers can be replaced by other hiphiles, such as sodium dodecylbenzene sulfonate (SDBS), sodium dodecylsulfate (SDS), and lysophospholipid (LPC 18 : 0).
N,P-codoped carbon networks as efficient metal-free bifunctional catalysts for oxygen reduction and hydrogen evolution reactions
Publisher: Wiley
Date: 28-12-2016
Abstract: The high cost and scarcity of noble metal catalysts, such as Pt, have hindered the hydrogen production from electrochemical water splitting, the oxygen reduction in fuel cells and batteries. Herein, we developed a simple template-free approach to three-dimensional porous carbon networks codoped with nitrogen and phosphorus by pyrolysis of a supermolecular aggregate of self-assembled melamine, phytic acid, and graphene oxide (MPSA/GO). The pyrolyzed MPSA/GO acted as the first metal-free bifunctional catalyst with high activities for both oxygen reduction and hydrogen evolution. Zn-air batteries with the pyrolyzed MPSA/GO air electrode showed a high peak power density (310 W g(-1) ) and an excellent durability. Thus, the pyrolyzed MPSA/GO is a promising bifunctional catalyst for renewable energy technologies, particularly regenerative fuel cells.
I2 -Doping of 1,4-polydienes
Publisher: Elsevier BV
Date: 03-1995
Electrophoresis coating of titanium dioxide on aligned carbon nanotubes for controlled syntheses of photoelectronic nanomaterials
Publisher: Wiley
Date: 07-05-2007
Self-Assembly of Gold Nanowires along Carbon Nanotubes for Ultrahigh-Aspect-Ratio Hybrids
Publisher: American Chemical Society (ACS)
Date: 04-05-2011
DOI: 10.1021/CM1033645
Fullerene-grafted graphene for efficient bulk heterojunction polymer photovoltaic devices
Publisher: American Chemical Society (ACS)
Date: 22-04-2011
DOI: 10.1021/JZ200428Y
Abstract: A simple lithiation reaction was developed to covalently attach monosubstituted C60 onto graphene nanosheets. Detailed spectroscopic (e.g., Fourier transform infrared, Raman) analyses indicated that C60 molecules were covalently attached onto the graphene surface through monosubstitution. Transmission electron microscopic (TEM) observation revealed that these monosubstituted C60 moieties acted as nucleation centers to promote the formation of C60 aggregates of ∼5 nm in diameter on the graphene surface. The resultant C60-grafted graphene nanosheets were used as electron acceptors in poly(3-hexylthiophene)-based bulk heterojunction solar cells to significantly improve the electron transport, and hence the overall device performance, yielding a power conversion efficiency of ∼1.22%.
Synthesis, characterization of the phenylquinoline-based on iridium(III) complexes for solution processable phosphorescent organic light-emitting diodes
Publisher: Elsevier BV
Date: 09-2013
One-dimensional (1D) [6,6]-phenyl-C61 -butyric acid methyl ester (PCBM) nanorods as an efficient additive for improving the efficiency and stability of perovskite solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA03605H
Abstract: We report a novel 1DPCBM nanorod material as an efficient additive to form a wrinkle-like bicontinuousperovskite layer, where 1D PCBM nanorods can distribute homogenously throughout the film with an enlarged grain size.
Uniform Two-Dimensional Co3 O4 Porous Sheets: Facile Synthesis and Enhanced Photocatalytic Performance
Publisher: Wiley
Date: 29-02-2016
Surface modification of aligned carbon nanotube arrays for electrochemical sensing applications
Publisher: American Vacuum Society
Date: 07-2003
DOI: 10.1116/1.1569926
Abstract: The excellent optoelectronic, mechanical, and thermal properties of carbon nanotubes have made them very attractive for a wide range of potential applications. However, many applications require the growth of aligned carbon nanotubes with surface modification. We have developed a simple pyrolytic method for large-scale production of aligned carbon nanotube arrays perpendicular to the substrate. These aligned carbon nanotube arrays can be transferred onto various substrates of particular interest (e.g., polymer films for organic optoelectronic devices) in either a patterned or non-patterned fashion. The well-aligned structure further allows us to prepare aligned coaxial nanowires by electrochemically depositing a concentric layer of an appropriate conducting polymer onto the in idual aligned carbon nanotubes. This approach is particularly attractive, as it allows surface characteristics of the aligned carbon nanotubes to be tuned to meet specific requirements for particular applications while their alignment structure can be largely retained. These aligned carbon nanotubes with tunable surface characteristics are of great significance to various practical applications. In this paper, we demonstrate the use of the conducting-polymer-coated aligned carbon nanotubes for electrochemical sensing applications.
Functionalization and applications of carbon nanotubes
Publisher: Elsevier
Date: 2006
Polyelectrolyte Functionalized Carbon Nanotubes as Efficient Metal-free Electrocatalysts for Oxygen Reduction
Publisher: American Chemical Society (ACS)
Date: 17-03-2011
DOI: 10.1021/JA1112904
Abstract: Having a strong electron-withdrawing ability, poly(diallyldimethylammonium chloride) (PDDA) was used to create net positive charge for carbon atoms in the nanotube carbon plane via intermolecular charge transfer. The resultant PDDA functionalized/adsorbed carbon nanotubes (CNTs), either in an aligned or nonaligned form, were demonstrated to act as metal-free catalysts for oxygen reduction reaction (ORR) in fuel cells with similar performance as Pt catalysts. The adsorption-induced intermolecular charge-transfer should provide a general approach to various carbon-based efficient metal-free ORR catalysts for oxygen reduction in fuel cells, and even new catalytic materials for applications beyond fuel cells.
N-doped carbon nanomaterials are durable catalysts for oxygen reduction reaction in acidic fuel cells
Publisher: American Association for the Advancement of Science (AAAS)
Date: 06-02-2015
Abstract: Carbon-based, metal-free catalysts showed excellent activity, durability and potential to replace Pt in acidic fuel cells.
On the rate dependence of mechanical properties of aligned carbon nanotube arrays
Publisher: Springer Science and Business Media LLC
Date: 04-2015
Nitrogen-Doped Colloidal Graphene Quantum Dots and Their Size-Dependent Electrocatalytic Activity for the Oxygen Reduction Reaction
Publisher: American Chemical Society (ACS)
Date: 08-11-2012
DOI: 10.1021/JA309270H
Abstract: Nitrogen doping has been a powerful way to modify the properties of carbon materials ranging from activated carbon to graphene. Here we report on a solution chemistry approach to nitrogen-doped colloidal graphene quantum dots with well-defined structures. N-doping was demonstrated to significantly affect the properties of the quantum dots, including the emergence of size-dependent electrocatalytic activity for the oxygen reduction reaction.
Controlled syntheses of conducting polymer micro- and nano-structures for potential applications
Publisher: Elsevier BV
Date: 03-2006
Label-Free Graphene Oxide Förster Resonance Energy Transfer Sensors for Selective Detection of Dopamine in Human Serums and Cells
Publisher: American Chemical Society (ACS)
Date: 28-11-2018
Vertically Aligned BCN Nanotubes as Efficient Metal‐Free Electrocatalysts for the Oxygen Reduction Reaction: A Synergetic Effect by Co‐Doping with Boron and Nitrogen
Publisher: Wiley
Date: 11-10-2011
Photovoltaic properties of MEH-PPV doped with new methanofullerene derivatives
Publisher: Elsevier BV
Date: 04-2003
Metal-free electrocatalysts for Oxygen reduction
Publisher: Springer London
Date: 2013
Self-Assembling of Carbon Nanotubes
Publisher: Wiley
Date: 24-01-2011
Nitrogen-Doped Graphene Nanoplatelets from Simple Solution Edge-Functionalization for n-Type Field-Effect Transistors
Publisher: American Chemical Society (ACS)
Date: 10-06-2013
DOI: 10.1021/JA402555N
Abstract: The development of a versatile method for nitrogen-doping of graphitic structure is an important challenge for many applications, such as energy conversions and storages and electronic devices. Here, we report a simple but efficient method for preparing nitrogen-doped graphene nanoplatelets via wet-chemical reactions. The reaction between monoketone (C═O) in graphene oxide (GO) and monoamine-containing compound produces imine (Shiff base) functionalized GO (iGO). The reaction between α-diketone in GO and 1,2-diamine (ortho-diamine)-containing compound gives stable pyrazine ring functionalized GO (pGO). Subsequent heat-treatments of iGO and pGO result in high-quality, nitrogen-doped graphene nanoplatelets to be designated as hiGO and hpGO, respectively. Of particular interest, hpGO was found to display the n-type field-effect transistor behavior with a charge neutral point (Dirac point) located at around -16 V. Furthermore, hpGO showed hole and electron mobilities as high as 11.5 and 12.4 cm(2)V(-1)s(-1), respectively.
Radiation chemistry for microfabrication of conjugated polymers and carbon nanotubes
Publisher: Elsevier BV
Date: 07-2001
Electroluminescent polymers and carbon nanotubes for flat panel displays
Publisher: SPIE
Date: 19-11-2001
DOI: 10.1117/12.454596
Elastic-plastic behaviors of vertically aligned carbon nanotube arrays by large-displacement indentation test
Publisher: Springer Netherlands
Date: 10-08-2014
Surface Functionalization of Carbon Dots with Polyhedral Oligomeric Silsesquioxane (POSS) for Multifunctional Applications
Publisher: Wiley
Date: 26-10-2016
Multifunctional luminescent nanomaterials from NaLa(MoO4)2:Eu3+/Tb3+ with tunable decay lifetimes, emission colors and enhanced cell viability
Publisher: Springer Science and Business Media LLC
Date: 11-08-2015
DOI: 10.1038/SREP11844
Abstract: A facile, but effective, method has been developed for large-scale preparation of NaLa(MoO 4 ) 2 nanorods and microflowers co-doped with Eu 3+ and Tb 3+ ions (abbreviated as: NLM:Ln 3+ ). The as-synthesized nanomaterials possess a pure tetragonal phase with variable morphologies from shuttle-like nanorods to microflowers by controlling the reaction temperature and the amount of ethylene glycol used. Consequently, the resulting nanomaterials exhibit superb luminescent emissions over the visible region from red through yellow to green by simply changing the relative doping ratios of Eu 3+ to Tb 3+ ions. Biocompatibility study indicates that the addition of NLM:Ln 3+ nanomaterials can stimulate the growth of normal human retinal pigment epithelium (ARPE-19) cells. Therefore, the newly-developed NaLa(MoO 4 ) 2 nanomaterials hold potentials for a wide range of multifunctional applications, including bioimaging, security protection, optical display, optoelectronics for information storage and cell stimulation.
Liquid Marbles Based on Magnetic Upconversion Nanoparticles as Magnetically and Optically Responsive Miniature Reactors for Photocatalysis and Photodynamic Therapy
Publisher: Wiley
Date: 03-08-2016
Abstract: Magnetic liquid marbles have recently attracted extensive attention for various potential applications. However, conventional liquid marbles based on iron oxide nanoparticles are opaque and inadequate for photo-related applications. Herein, we report the first development of liquid marbles coated with magnetic lanthanide-doped upconversion nanoparticles (UCNPs) that can convert near-infrared light into visible light. Apart from their excellent magnetic and mechanical properties, which are attractive for repeatable tip opening and magnetically directed movements, the resultant UCNP-based liquid marbles can act as ideal miniature reactors for photodynamic therapy of cancer cells. This work opens new ways for the development of liquid marbles, and shows great promise for liquid marbles based on UCNPs to be used in a large variety of potential applications, such as photodynamic therapy for accelerated drug screening, magnetically guided controlled drug delivery and release, and multifunctional actuation.
PAF-derived nitrogen-doped 3D carbon materials for efficient energy conversion and storage
Publisher: Springer Science and Business Media LLC
Date: 05-06-2015
DOI: 10.1038/SREP08307
Super-long aligned TiO2 /carbon nanotube arrays
Publisher: IOP Publishing
Date: 22-11-2010
DOI: 10.1088/0957-4484/21/50/505702
Abstract: 5 mm long aligned titanium oxide/carbon nanotube (TiO(2)/CNT) coaxial nanowire arrays have been prepared by electrochemically coating the constituent CNTs with a uniform layer of highly crystalline anatase TiO(2) nanoparticles. While the presence of the TiO(2) coating was confirmed by scanning electron microscopy, transmission electron microscopy, Raman spectroscopy and x-ray diffraction, the resultant TiO(2)/CNT coaxial arrays were demonstrated to exhibit minimized recombination of photoinduced electron-hole pairs and fast electron transfer from the long TiO(2)/CNT arrays to external circuits. This, in conjunction with the aligned macrostructure, facilitates the fabrication of TiO(2)/CNT arrays for various device applications, ranging from photodetectors to photocatalytic systems. Thus, the millimeter long TiO(2)/CNT arrays represent a significant advance in the development of new macroscopic photoelectronic nanomaterials attractive for a variety of device applications beyond those demonstrated in this study.
Multilayer white polymer light-emitting diodes with deoxyribonucleic acid-cetyltrimetylammonium complex as a hole-transporting/electron-blocking layer
Publisher: AIP Publishing
Date: 23-06-2008
DOI: 10.1063/1.2948864
Abstract: Using a thin film of deoxyribonucleic acid-cetyltrimetylammonium (DNA-CTMA) complex as a hole-transporting/electron-blocking layer, we have developed a sequential solution-processing approach for constructing multilayer (up to five layers) white polymer light-emitting diodes, incorporating the poly(9,9-dioctylfluorene-2,7-diyl) oly[2-methoxy-5(2′-ethyl-hexyloxy)-1, 4-phenylene vinylene] emissive layer. These devices were demonstrated to show a low turn-on voltage (∼5V), high efficiency (10.0cd∕A), and high brightness (10500cd∕m2) with an improved white-color stability.
Preparation of microvillus-like nitrogen-doped carbon nanotubes as the cathode of a microbial fuel cell
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5TA06673E
Abstract: The efficiency of a microbial fuel cell (MFC) generally suffers from its poor cathode performance. To improve this, a novel cathode material was prepared by growing vertically aligned nitrogen-doped carbon nanotubes on carbon cloth, offering an efficient, metal-free, and low-cost alternative to Pt/C.
High-Performance Li-CO2 Batteries from Free-Standing, Binder-Free, Bifunctional Three-Dimensional Carbon Catalysts
Publisher: American Chemical Society (ACS)
Date: 14-02-2020
Carbon nanotube arrays with strong shear binding-on and easy normal lifting-off
Publisher: American Association for the Advancement of Science (AAAS)
Date: 10-10-2008
Abstract: The ability of gecko lizards to adhere to a vertical solid surface comes from their remarkable feet with aligned microscopic elastic hairs. By using carbon nanotube arrays that are dominated by a straight body segment but with curly entangled top, we have created gecko-foot–mimetic dry adhesives that show macroscopic adhesive forces of ∼100 newtons per square centimeter, almost 10 times that of a gecko foot, and a much stronger shear adhesion force than the normal adhesion force, to ensure strong binding along the shear direction and easy lifting in the normal direction. This anisotropic force distribution is due to the shear-induced alignments of the curly segments of the nanotubes. The mimetic adhesives can be alternatively binding-on and lifting-off over various substrates for simulating the walking of a living gecko.
CO2 Overall Splitting by a Bifunctional Metal‐Free Electrocatalyst
Publisher: Wiley
Date: 06-09-2018
Abstract: Photo/electrochemical CO 2 splitting is impeded by the low cost‐effective catalysts for key reactions: CO 2 reduction (CDRR) and water oxidation. A porous silicon and nitrogen co‐doped carbon (SiNC) nanomaterial by a facile pyrolyzation was developed as a metal‐free bifunctional electrocatalyst. CO 2 ‐to‐CO and oxygen evolution (OER) partial current density under neutral conditions were enhanced by two orders of magnitude in the Tafel regime on SiNC relative to single‐doped comparisons beyond their specific area gap. The photovoltaic‐driven CO 2 splitting device with SiNC electrodes imitating photosynthesis yielded an overall solar‐to‐chemical efficiency of advanced 12.5 % (by multiplying energy efficiency of CO 2 splitting cell and photovoltaic device) at only 650 mV overpotential. Mechanism studies suggested the elastic electron structure of −Si(O)−C−N− unit in SiNC as the highly active site for CDRR and OER simultaneously by lowering the free energy of CDRR and OER intermediates adsorption.
Amphiphilic light-emitting dendrons with oligo(phenylene vinylene) branches and oligo(ethylene oxide) terminal chains
Publisher: Elsevier BV
Date: 03-2006
A Facile Route to Bimetal and Nitrogen-Codoped 3D Porous Graphitic Carbon Networks for Efficient Oxygen Reduction
Publisher: Wiley
Date: 07-07-2016
Abstract: Bimetal nitrogen-doped carbon with both Fe and Co, derived from the pyrolysis carbon of iron and cobalt phthalocyanine-based conjugated polymer networks, possesses a few-layer graphene-like texture with hierarchical porosity in meso/micro multimodal pore size distribution. The novel electrocatalyst exhibits Pt-like catalytic activity and much higher catalytic durability for oxygen reduction.
The Suitability of Stool Antigen Testing in the Detection of Helicobacter pylori in a Regional and Rural Area of Australia
Publisher: Hindawi Limited
Date: 20-10-2023
DOI: 10.1155/2023/6642474
Organo-soluble chiral thiol-monolayer-protected gold nanorods
Publisher: American Chemical Society (ACS)
Date: 10-12-2011
DOI: 10.1021/LA104131Y
Abstract: Here, we report the synthesis and characterization of organo-soluble chiral thiol-monolayer-protected gold nanorods. The resulting gold nanorods respectively covered with two opposite enantiomers via the strong covalent Au-S linkage were found to not only be stable in both organic media and solid state, but also show optical activity. Their circular dichroism (CD) spectra exhibited a mirror image relationship, indicating that enantiomeric thiol surfactant on gold surface can produce the corresponding enantiomeric gold nanorods. The densely packed azobenzene thiol monolayer on gold surface exhibited a photoresponsive behavior upon irradiation with 254 nm light instead of 365 nm light, which was found to have an effect on plasmonic absorption of gold nanorods.
Photovoltaic-active dithienosilole-containing polymers
Publisher: American Chemical Society (ACS)
Date: 28-11-2007
DOI: 10.1021/MA071825X
Multicomponent micropatterns or carbon nanotubes
Publisher: Elsevier BV
Date: 09-2005
Asymmetric end-functionalization of multi-walled carbon nanotubes
Publisher: American Chemical Society (ACS)
Date: 03-2005
DOI: 10.1021/JA0423670
Abstract: Asymmetric end-functionalization of carbon nanotubes was achieved by sequentially floating a substrate-free aligned carbon nanotube film on two different photoreactive solutions with only one side of the nanotube film being contacted with the photoreactive solution and exposed to UV light each time. The resultant nanotubes with different chemical reagents attached onto their opposite tube-ends should be very useful for site-selective self-assembling of carbon nanotubes into many novel functional structures for various potential applications.
Surface modification of aligned carbon nanotube arrays for electron emitting applications
Publisher: Elsevier BV
Date: 09-2005
Concurrent oxygen reduction and water oxidation at high ionic strength for scalable electrosynthesis of hydrogen peroxide
Publisher: Springer Science and Business Media LLC
Date: 19-09-2023
The Dependence of Benzo-15-Crown-5 Ether-Containing Oligo Paraphenylene Vinylene (CE-OPV) Emission Upon Complexation with Metal Ions in Solution
Publisher: Springer Science and Business Media LLC
Date: 09-2003
A facile approach to high-performance trifunctional electrocatalysts by substrate-enhanced electroless deposition of Pt/NiO/Ni on carbon nanotubes
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0NR03378B
Abstract: Trifunctional electrocatalysts for the oxygen reduction reaction (ORR), oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are crucial for many electrochemical devices.
Cytotoxicity of single-walled carbon nanotubes with human ocular cells
Publisher: Trans Tech Publications, Ltd.
Date: 07-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.287-290.32
Abstract: In this paper, we report the first study on cytotoxicity of single-walled carbon nanotubes (SWCNTs) and theirs derivatives with human ocular cells, such as ARPE-19 cells. In particular, we have systematically investigated the cytotoxicity of SWCNTs, hydroxyl-functionalized SWCNTs (SWCNT-OH), and carboxylic functionalized SWCNTs (SWCNT-COOH) with ARPE-19 cells by examining their influence on the cell morphology, viability, oxidative stress, membrane integrity and apoptosis. To this end, various methods, including optical micrography, CCK-8 assay, LDH assay, SOD assay, TEM and Apoptosis assay, have been used in this study. Our results suggest that SWCNTs could cause an decrease in the cell survival rate, changes in the SOD level, membrane integrity and cell apoptosis, indicating a high toxicity to ARPE-19 cells. However, chemical functionalization of SWCNTs with –OH and –COOH groups was found to significantly improve the biocompatibility of SWCNTs. Among the SWCNTs and their derivatives studied in this work, the SWCNT-COOH exhibits the best biocompatibility to ARPE-19 cells.
Multifunctional luminescent nanofibres from Eu3+-doped La2O2SO4 with enhanced oxygen storage capability
Publisher: Elsevier BV
Date: 02-2017
Plasma etching for purification and controlled opening of aligned carbon nanotubes
Publisher: American Chemical Society (ACS)
Date: 19-03-2002
DOI: 10.1021/JP014047Y
Scanning tunneling microscopy of aligned coaxial nanowires of polyaniline passivated carbon nanotubes
Publisher: Elsevier BV
Date: 07-2001
Synthesis of fullerene- and fullerol-containing polymers
Publisher: Royal Society of Chemistry (RSC)
Date: 1998
DOI: 10.1039/A703764C
A facile and versatile approach to biocompatible fluorescent polymers from polymerizable carbon nanodots
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CC35966A
Abstract: Highly fluorescent polymerizable carbon nanodots (PCNDs), synthesized by microwave assisted pyrolysis and subsequent surface vinylation, were copolymerized with several model monomers to form different functional fluorescent polymeric materials in solution or the solid-state, indicating a simple and versatile approach to novel fluorescent polymer materials.
Aligned Nanotubes
Publisher: Wiley
Date: 06-11-2003
Abstract: Since the discovery of carbon nanotubes by lijima in 1991, various carbon nanotubes with either a single- or multilayered graphene cylinder(s) have been produced, along with their noncarbon counterparts (for ex le, inorganic and polymer nanotubes). These nanostructured materials often possess size-dependent properties and show new phenomena related to the nanosize confinement of the charge carriers inside, which leads to the possibility of developing new materials with useful properties and advanced devices with desirable features for a wide range of applications. In particular, carbon nanotubes have been shown to exhibit superior properties attractive for various potential applications, ranging from their use as novel electron emitters in flat-panel displays to electrodes in electrochemical sensors. For many of the applications, it is highly desirable to have aligned atterned forms of carbon nanotubes so that their structure roperty can be easily assessed and so that they can be effectively incorporated into devices. In this Review, we present an overview on the development of aligned and micropatterned nanotubes, with an emphasis on carbon nanotubes.
Large-scale production of edge-selectively functionalized graphene nanoplatelets via ball milling and their use as metal-free electrocatalysts for oxygen reduction reaction
Publisher: American Chemical Society (ACS)
Date: 12-11-2013
DOI: 10.1021/JA3091643
Abstract: Edge-selectively functionalized graphene nanoplatelets (EFGnPs) with different functional groups were efficiently prepared simply by dry ball milling graphite in the presence of hydrogen, carbon dioxide, sulfur trioxide, or carbon dioxide/sulfur trioxide mixture. Upon exposure to air moisture, the resultant hydrogen- (HGnP), carboxylic acid- (CGnP), sulfonic acid- (SGnP), and carboxylic acid/sulfonic acid- (CSGnP) functionalized GnPs readily dispersed into various polar solvents, including neutral water. The resultant EFGnPs were then used as electrocatalysts for oxygen reduction reaction (ORR) in an alkaline electrolyte. It was found that the edge polar nature of the newly prepared EFGnPs without heteroatom doping into their basal plane played an important role in regulating the ORR efficiency with the electrocatalytic activity in the order of SGnP > CSGnP > CGnP > HGnP > pristine graphite. More importantly, the sulfur-containing SGnP and CSGnP were found to have a superior ORR performance to commercially available platinum-based electrocatalyst.
The photoconductivity of PVK-carbon nanotube blends
Publisher: Elsevier BV
Date: 09-2002
Microscopic and macroscopic structures of carbon nanotubes produced by pyrolysis of iron phthalocyanine
Publisher: Springer Science and Business Media LLC
Date: 2002
Doping of Carbon Materials for Metal‐Free Electrocatalysis
Publisher: Wiley
Date: 19-12-2018
Abstract: Carbon atoms in the graphitic carbon skeleton can be replaced by heteroatoms with different electronegative from that of the carbon atom (i.e., heteroatom doping) to modulate the charge distribution over the carbon network. The charge modulation can be achieved via direct charge transfer with an electron acceptor/donor (i.e., charge transfer doping) or through introduction of defects (i.e., defective doping). Various doping strategies, including heteroatom doping, charge-transfer doping, and defective doping, have now been devised for modulating the charge distribution of numerous graphite carbon materials to impart new properties to carbon materials. Consequently, carbon nanomaterials with defined doping have recently become prominent members in the carbon family, promising for a variety of applications, including catalysis, energy conversion and storage, environmental remediation, and important chemical production and industrial processes. The purpose of this review is to present an overview on the doping of carbon materials for metal-free electrocatalysis, especially the development of doping strategies and doping-induced structure and property changes for potential catalytic applications. Current challenges and future perspectives in the doped carbon-based metal-free catalyst field are also discussed.
Oxygen Reduction Reaction in a Droplet on Graphite: Direct Evidence that the Edge Is More Active than the Basal Plane
Publisher: Wiley
Date: 14-08-2014
Abstract: Carbon-based metal-free electrocatalysts for the oxygen reduction reaction (ORR) in alkaline medium have been extensively investigated with the aim of replacing the commercially available, but precious platinum-based catalysts. For the proper design of carbon-based metal-free electrocatalysts for the ORR, it would be interesting to identify the active sites of the electrocatalyst. The ORR was now studied with an air-saturated electrolyte solution droplet (diameter ca. 15 μm), which was deposited at a specified position either on the edge or on the basal plane of highly oriented pyrolytic graphite. Electrochemical measurements suggest that the edge carbon atoms are more active than the basal-plane ones for the ORR. This provides a direct way to identify the active sites of carbon materials for the ORR. Ball-milled graphite and carbon nanotubes with more exposed edges were also prepared and showed significantly enhanced ORR activity. DFT calculations elucidated the mechanism by which the charged edge carbon atoms result in the higher ORR activity.
Turn on behavior of light emitting electrochemical cells
Publisher: Elsevier BV
Date: 06-1999
Highly efficient quantum-dot light-emitting diodes with DNA-CTMA as a combined hole-transporting and electron-blocking layer
Publisher: American Chemical Society (ACS)
Date: 17-02-2009
DOI: 10.1021/NN8009079
Abstract: Owing to their narrow bright emission band, broad size-tunable emission wavelength, superior photostability, and excellent flexible-substrate compatibility, light-emitting diodes based on quantum dots (QD-LEDs) are currently under intensive research and development for multiple consumer applications including flat-panel displays and flat lighting. However, their commercialization is still precluded by the slow development to date of efficient QD-LEDs as even the highest reported efficiency of 2.0% cannot favorably compete with their organic counterparts. Here, we report QD-LEDs with a record high efficiency (approximately 4%), high brightness (approximately 6580 cd/m(2)), low turn-on voltage (approximately 2.6 V), and significantly improved color purity by simply using deoxyribonucleic acid (DNA) complexed with cetyltrimetylammonium (CTMA) (DNA-CTMA) as a combined hole transporting and electron-blocking layer (HTL/EBL). This, together with controlled thermal decomposition of ligand molecules from the QD shell, represents a novel combined, but simple and very effective, approach toward the development of highly efficient QD-LEDs with a high color purity.
Enhancing Photocatalytic Activity of Graphitic Carbon Nitride by Codoping with P and C for Efficient Hydrogen Generation
Publisher: American Chemical Society (ACS)
Date: 21-06-2017
Abstract: The generation of clean hydrogen gas from photocatalytic water splitting by using graphitic carbon nitride (g-C
Multidimensional ZnO architecture for dye-sensitized solar cells with high-efficiency up to 7.35%
Publisher: Wiley
Date: 05-03-2014
Highly luminescent carbon nanodots by microwave-assisted pyrolysis
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CC33869F
Abstract: Carbon nanodots (CDs) with a low cytotoxicity have been synthesized by one-step microwave-assisted pyrolysis of citric acid in the presence of various amine molecules. The primary amine molecules have been confirmed to serve dual roles as N-doping precursors and surface passivation agents, both of which considerably enhanced the fluorescence of the CDs.
Controlled growth and modification of aligned carbon nanotubes for multifunctional nanocomposites and nanodevices
Publisher: IEEE
Date: 2010
Liquid crystalline polymers for efficient bilayer-bulk-heterojunction solar cells
Publisher: American Chemical Society (ACS)
Date: 10-04-2009
DOI: 10.1021/JP900241R
Direct observation of conformational transitions for polyaniline chains intercalated in clay particles upon secondary doping
Publisher: Springer Science and Business Media LLC
Date: 2000
Membranes of vertically aligned superlong carbon nanotubes
Publisher: American Chemical Society (ACS)
Date: 09-06-2011
DOI: 10.1021/LA200995R
Abstract: In the present work, we have developed a simple but effective method to prepare superlong vertically aligned carbon nanotubes (SLVA-CNT) and epoxy composite membranes, and we have demonstrated that various liquids, including water, hexane, and dodecane, can effectively pass through the SLVA-CNT membranes. These results were confirmed by molecular dynamics simulations. While the mechanical densification was used to further enhance the flow transport through the SLVA-CNT membranes, we developed in this study a magnetic-nanoparticle switching system to turn on and off the flow through the nanotube membrane by simply applying an alternating voltage. The methodologies developed in this study should have a significant implication to the development of various smart membranes for advanced intelligent systems.
Assessment of human lung macrophages after exposure to multi-walled carbon nanotubes part I. Cytotoxicity
Publisher: American Scientific Publishers
Date: 02-2011
Assessment of human lung macrophages after exposure to multi-walled carbon nanotubes part II. DNA damage
Publisher: American Scientific Publishers
Date: 02-2011
3-D Carbon Nanotube Structures Used as High Performance Catalyst for Oxygen Reduction Reaction
Publisher: American Chemical Society (ACS)
Date: 15-10-2010
DOI: 10.1021/JA104425H
Abstract: We report a high performance oxygen reduction reaction (ORR) catalyst based on vertically aligned, nitrogen-doped carbon nanotube (VA-NCNT) arrays. Characterization in conditions analogous to the operation of a polymer electrolyte membrane fuel cell show ORR taking place on the catalyst at a favorable reduction potential with a superior current density and greater rate constant.
Droplet Manipulation on Wettable Gradient Surfaces with Micro-/Nano-Hierarchical Structure
Publisher: American Chemical Society (ACS)
Date: 24-05-2016
Efficiently photo-charging lithium-ion battery by perovskite solar cell
Publisher: Springer Science and Business Media LLC
Date: 27-08-2015
DOI: 10.1038/NCOMMS9103
Abstract: Electric vehicles using lithium-ion battery pack(s) for propulsion have recently attracted a great deal of interest. The large-scale practical application of battery electric vehicles may not be realized unless lithium-ion batteries with self-charging suppliers will be developed. Solar cells offer an attractive option for directly photo-charging lithium-ion batteries. Here we demonstrate the use of perovskite solar cell packs with four single CH 3 NH 3 PbI 3 based solar cells connected in series for directly photo-charging lithium-ion batteries assembled with a LiFePO 4 cathode and a Li 4 Ti 5 O 12 anode. Our device shows a high overall photo-electric conversion and storage efficiency of 7.80% and excellent cycling stability, which outperforms other reported lithium-ion batteries, lithium–air batteries, flow batteries and super-capacitors integrated with a photo-charging component. The newly developed self-chargeable units based on integrated perovskite solar cells and lithium-ion batteries hold promise for various potential applications.
Enhancement of through-thickness thermal conductivity in adhesively bonded joints using aligned carbon nanotubes
Publisher: Elsevier BV
Date: 03-2008
Development of an electrochemical-based aspartate aminotransferase nanoparticle ir-c biosensor for screening of liver diseases
Publisher: MDPI AG
Date: 29-05-2012
DOI: 10.3390/BIOS2020234
Graphene based energy devices
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR90062J
Thermal cis-trans isomerization and temperature-dependent phase behaviour of polyisoprene-polyacetylene solutions
Publisher: Wiley
Date: 06-1997
High-Performance Li-CO2 Batteries Based on Metal-Free Carbon Quantum Dot/Holey Graphene Composite Catalysts
Publisher: Wiley
Date: 08-10-2018
Solvent-free mechanochemical reduction of graphene oxide
Publisher: Elsevier BV
Date: 10-2014
Conjugation of polydienes by oxidants other than iodine
Publisher: Elsevier BV
Date: 02-1997
Defect Chemistry of Nonprecious-Metal Electrocatalysts for Oxygen Reactions
Publisher: Wiley
Date: 16-05-2017
Abstract: Oxygen electrocatalysis, including the oxygen-reduction reaction (ORR) and oxygen-evolution reaction (OER), is a critical process for metal-air batteries. Therefore, the development of electrocatalysts for the OER and the ORR is of essential importance. Indeed, various advanced electrocatalysts have been designed for the ORR or the OER however, the origin of the advanced activity of oxygen electrocatalysts is still somewhat controversial. The enhanced activity is usually attributed to the high surface areas, the unique facet structures, the enhanced conductivities, or even to unclear synergistic effects, but the importance of the defects, especially the intrinsic defects, is often neglected. More recently, the important role of defects in oxygen electrocatalysis has been demonstrated by several groups. To make the defect effect clearer, the recent development of this concept is reviewed here and a novel principle for the design of oxygen electrocatalysts is proposed. An overview of the defects in carbon-based, metal-free electrocatalysts for ORR and various defects in metal oxides/selenides for OER is also provided. The types of defects and controllable strategies to generate defects in electrocatalysts are presented, along with techniques to identify the defects. The defect-activity relationship is also explored by theoretical methods.
Photo-induced formation and self-assembling of gold nanoparticles in aqueous solution of amphiphilic dendrimers with oligo(p-phenylene vinylene) core branches and oligo(ethylene oxide) terminal chains
Publisher: IOP Publishing
Date: 14-08-2007
Synthesis and structures of aligned branched carbon nanotubes produced by pyrolysis of iron(II) phthalocyanine
Publisher: Elsevier BV
Date: 10-2002
DNA-modified carbon nanotubes for self-assembling and biosensing applications
Publisher: Elsevier BV
Date: 09-2005
Charge-transfer complexes between polyacetylene-type polymers and iodine in solution
Publisher: American Chemical Society (ACS)
Date: 07-1992
DOI: 10.1021/J100194A067
Biocompatible Graphene Oxide-Based Glucose Biosensors
Publisher: American Chemical Society (ACS)
Date: 29-03-2010
DOI: 10.1021/LA100886X
Abstract: This letter demonstrates that a novel, highly efficient enzyme electrode can be directly obtained using covalent attachment between carboxyl acid groups of graphene oxide sheets and amines of glucose oxidase. The resulting biosensor exhibits a broad linear range up to 28 mM x mm(-2) glucose with a sensitivity of 8.045 mA x cm(-2) x M(-1). The glucose oxidase-immobilized graphene oxide electrode also shows a reproducibility and a good storage stability, suggesting potentials for a wide range of practical applications. The biocompatibility of as-synthesized graphene oxide nanosheets with human cells, especially retinal pigment epithelium (RPE) cells, was investigated for the first time in the present work. Microporous graphene oxide exhibits good biocompatibility and has potential advantages with respect to cell attachment and proliferation, leading to opportunities for using graphene-based biosensors for the clinical diagnosis.
Optical limiters and photovoltaic devices based on C60 , carbon nanotubes and their nanocomposites
Publisher: Elsevier
Date: 2006
Sulfur-graphene nanostructured cathodes via ball-milling for high-performance lithium-sulfur batteries
Publisher: American Chemical Society (ACS)
Date: 13-10-2014
DOI: 10.1021/NN5047585
Abstract: Although much progress has been made to develop high-performance lithium-sulfur batteries (LSBs), the reported physical or chemical routes to sulfur cathode materials are often multistep/complex and even involve environmentally hazardous reagents, and hence are infeasible for mass production. Here, we report a simple ball-milling technique to combine both the physical and chemical routes into a one-step process for low-cost, scalable, and eco-friendly production of graphene nanoplatelets (GnPs) edge-functionalized with sulfur (S-GnPs) as highly efficient LSB cathode materials of practical significance. LSBs based on the S-GnP cathode materials, produced by ball-milling 70 wt % sulfur and 30 wt % graphite, delivered a high initial reversible capacity of 1265.3 mAh g(-1) at 0.1 C in the voltage range of 1.5-3.0 V with an excellent rate capability, followed by a high reversible capacity of 966.1 mAh g(-1) at 2 C with a low capacity decay rate of 0.099% per cycle over 500 cycles, outperformed the current state-of-the-art cathode materials for LSBs. The observed excellent electrochemical performance can be attributed to a 3D "sandwich-like" structure of S-GnPs with an enhanced ionic conductivity and lithium insertion/extraction capacity during the discharge-charge process. Furthermore, a low-cost porous carbon paper pyrolyzed from common filter paper was inserted between the 0.7S-0.3GnP electrode and porous polypropylene film separator to reduce/eliminate the dissolution of physically adsorbed polysulfide into the electrolyte and subsequent cross-deposition on the anode, leading to further improved capacity and cycling stability.
Aligned/micropatterned carbon nanotube arrays: Surface functionalization and electrochemical sensing
Publisher: SPIE
Date: 25-03-2005
DOI: 10.1117/12.596907
Metal-free carbon nanomaterials become more active than metal catalysts and last longer
Publisher: American Chemical Society (ACS)
Date: 07-2010
DOI: 10.1021/JZ100533T
Electrocatalysis for CO2conversion: from fundamentals to value-added products
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0CS00071J
Abstract: This timely and comprehensive review mainly summarizes advances in heterogeneous electroreduction of CO 2 : from fundamentals to value-added products.
Polymer-carbon nanotube sheets for conformal load bearing antennas
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2010
Iron nanoparticle driven spin-valve behavior in aligned carbon nanotube arrays
Publisher: AIP Publishing
Date: 27-10-2008
DOI: 10.1063/1.2999374
Abstract: We report the operation of spin-valve structures formed from arrays of aligned carbon nanotubes. The devices require only one deposited ferromagnetic layer with the embedded iron catalyst nanoparticle serving as the other magnetic electrode. A peak in the resistance occurs clearly as a result of the reversal of the magnetization of the electrodes. Device magnetoresistance ratios reach 25%, yielding an estimate of the spin scattering length of 9μm at low temperature.
<I>Mono</I>- and <I>Bis</I>-Terpyridine-Based Dimer and Metallo-Organic Polymers as Ionic Templates for Preparation of Multi-Metallic Au Nanocluster and Nanowires
Publisher: American Scientific Publishers
Date: 03-2016
Abstract: The preparation of multi-metallic Au nanocluster and nanowires has been achieved using terpyridine-based metallo-organic polymers as multi-ionic templates through a straightforward counterion exchange with aqueous NaAuCl4 followed by a mild reduction in-situ with sodium citrate. The mild reduction of the [TpyFeTpy]2+ x 2[AuCl4]- complex, derived from [TpyFeTpy]2+ x 2Cl- 1 (tpy = 2,2':6',2"-terpyridine), led to the formation of Au nanoclusters (Au NC) with diameters ranging from 7.5-88 nm. Each Au NC alone contained multiple nanoparticles, with diameters ranging from 2.5-4.5 nm. 1,4-bis-terpyridine based metallo-oraganic polymer [-TpyFeTpy-TpyFeTpy-]n(2n+) x [Cl]2n- 2 was found to generate a multi-ionic metallo-polymer with AuCl4- as the counterion, after mild reduction with sodium citrate, resulting in irregular zigzag shaped Au nanowires (Au NW). The prepared Au NW from the di-metallic complex 3 should find applications within electronic devices. Both Au NC and NW were also found to possess excellent catalytic properties.
Nitrogen-doped Ti3 C2 Tx MXene electrodes for high-performance supercapacitors
Publisher: Elsevier BV
Date: 08-2017
Biosensors based on aligned carbon nanotubes coated with inherently conducting polymers
Publisher: Wiley
Date: 08-2003
Electrospun polymer nanofiber sensors
Publisher: Elsevier BV
Date: 09-2005
Conformations of block copolymers terminally adsorbed at the solid-liquid interface
Publisher: Informa UK Limited
Date: 06-1992
Chemistry of vertically-aligned carbon nanotubes
Publisher: WORLD SCIENTIFIC
Date: 2011
Electroactive and biocompatible hydroxyl- functionalized graphene by ball milling
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM30961K
Leveraging Metal Nodes in Metal–Organic Frameworks for Advanced Anodic Hydrazine Oxidation Assisted Seawater Splitting
Publisher: American Chemical Society (ACS)
Date: 06-2023
Carbon-Based Metal-Free Electrocatalysts: Past, Present, and Future
Publisher: American Chemical Society (ACS)
Date: 28-10-2021
Magnetic liquid marbles: A precise miniature reactor
Publisher: Wiley
Date: 31-08-2010
Morphology controllable and highly luminescent monoclinic LaPO4:Eu3+ microspheres
Publisher: Elsevier BV
Date: 2014
Controlled fabrication of aligned carbon nanotube patterns
Publisher: Elsevier BV
Date: 10-2002
Conformational Transitions of Polymer Brushes for Reversibly Switching Graphene Transistors
Publisher: American Chemical Society (ACS)
Date: 30-09-2016
Two-Dimensional Fully Conjugated Polymeric Photosensitizers for Advanced Photodynamic Therapy
Publisher: American Chemical Society (ACS)
Date: 15-11-2016
Preparation and electrocatalytic activity of gold nanoparticles immobilized on the surface of 4-mercaptobenzoyl-functionalized multiwalled carbon nanotubes
Publisher: American Chemical Society (ACS)
Date: 20-12-2011
DOI: 10.1021/JP109890U
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View Funded ActivityARC Centres Of Excellence - Grant ID: CE0348245
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