ORCID Profile
0000-0002-2437-319X
Current Organisations
Universidade Federal dos Vales do Jequitinhonha e Mucuri
,
CSIRO Lindfield
,
University of New South Wales
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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)
Nanomaterials | Nanotechnology | Functional materials | Renewable Power and Energy Systems Engineering (excl. Solar Cells) | Materials engineering | Chemical engineering | Medical Devices | Sensor Technology (Chemical aspects) | Nanomaterials | Composite and hybrid materials | Electrochemical energy storage and conversion | Nanofabrication, Growth and Self Assembly
ANZSRC Socio-Economic Objective (SEO)
Energy Storage (excl. Hydrogen) | Diagnostic Methods | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Health Status (e.g. Indicators of Well-Being) |
Related Links
Publications
3-Orders-of-magnitude density control of single-walled carbon nanotube networks by maximizing catalyst activation and dosing carbon supply
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1NR10765H
Abstract: Tailoring the density of random single-walled carbon nanotube (SWCNT) networks is of paramount importance for various applications, yet it remains a major challenge due to the insufficient catalyst activation in most growth processes. Here we report on a simple and effective method to maximise the number of active catalyst nanoparticles using catalytic chemical vapor deposition (CCVD). By modulating short pulses of acetylene into a methane-based CCVD growth process, the density of SWCNTs is dramatically increased by up to three orders of magnitude without increasing the catalyst density and degrading the nanotube quality. In the framework of a vapor-liquid-solid model, we attribute the enhanced growth to the high dissociation rate of acetylene at high temperatures at the nucleation stage, which can be effective in both supersaturating the larger catalyst nanoparticles and overcoming the nanotube nucleation energy barrier of the smaller catalyst nanoparticles. These results are highly relevant to numerous applications of random SWCNT networks in next-generation energy, sensing and biomedical devices.
Dewetting of polymer films by ion implantation
Publisher: Springer Science and Business Media LLC
Date: 27-01-2009
DOI: 10.1140/EPJE/I2008-10430-4
Abstract: We report dewetting of thermodynamically stable, thick (approximately 100 nm) polystyrene films by titanium ion implantation. The dynamic dewetting patterns in time evolution are recorded. The dewetting mechanism is determined to be heterogeneous nucleation, where the defects and Ti nanoparticles formed by ion implantation serve as the nuclei. In addition, we observe abundant rims with regular polygonal shapes in dewetting patterns. This is attributed to fingering instability, which results from the balance between the driving force arisen from thermally induced surface tension gradient and the resistive forces from the combination of friction force, Laplace pressure and long-range van der Waals interactions. Finally, a model based on mass conservation is used to qualitatively describe the transition from circular to polygonal shaped rims at a critical diameter for holes.
Pre-lithiation of onion-like carbon/MoS2 nano-urchin anodes for high-performance rechargeable lithium ion batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4NR01553C
Abstract: Pre-lithiation of a MoS 2 /OLC nano-urchin hybrid structure shows great potential in developing good performance lithium ion batteries with ultra-high initial coulombic efficiency.
Effective photoluminescence modification of ZnO nanocombs by plasma immersion ion implantation
Publisher: IEEE
Date: 2008
Quenching of surface-exciton emission from ZnO nanocombs by plasma immersion ion implantation
Publisher: AIP Publishing
Date: 13-08-2007
DOI: 10.1063/1.2772668
Abstract: Surface modification of ZnO nanocombs was performed through a Ti plasma immersion ion implantation (PIII) with low bias voltages ranging from 0to5kV to quench surface-originated exciton emission. The ion energy dependent surface modification on ZnO was investigated using transmission electron microscopy and temperature-dependent photoluminescence (PL). The surface exciton (SX) was clearly identified for the as-grown s le at 4.5K, and complete quenching was observed for s le treated with 5kV PIII due to surface state passivation. The SX related surface states were located within 5nm in depth from the surface corresponding to the implantation depth of 5kV PIII. Room-temperature PL enhancement of these surface-modified ZnO nanocombs was observed and discussed. The results show that PIII can become a viable technique for nanostructure surface passivation.
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.
Modulating Pt-O-Pt atomic clusters with isolated cobalt atoms for enhanced hydrogen evolution catalysis
Publisher: Springer Science and Business Media LLC
Date: 04-05-2022
DOI: 10.1038/S41467-022-30155-4
Abstract: Platinum is the most efficient catalyst for hydrogen evolution reaction in acidic conditions, but its widespread use has been impeded by scarcity and high cost. Herein, Pt atomic clusters (Pt ACs) containing Pt-O-Pt units were prepared using Co/N co-doped carbon (CoNC) as support. Pt ACs are anchored to single Co atoms on CoNC by forming strong interactions. Pt-ACs/CoNC exhibits only 24 mV overpotential at 10 mA cm −2 and a high mass activity of 28.6 A mg −1 at 50 mV, which is more than 6 times higher than commercial Pt/C with any Pt loadings. Spectroscopic measurements and computational modeling reveal the enhanced hydrogen generation activity attributes to the charge redistribution between Pt and O atoms in Pt-O-Pt units, making Pt atoms the main active sites and O linkers the assistants, thus optimizing the proton adsorption and hydrogen desorption. This work opens an avenue to fabricate noble-metal-based ACs stabilized by single-atom catalysts with desired properties for electrocatalysis.
High‐Efficiency Transmissive Programmable Metasurface for Multimode OAM Generation
Publisher: Wiley
Date: 14-06-2020
Atomic Co decorated free-standing graphene electrode assembly for efficient hydrogen peroxide production in acid
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1EE02884G
Abstract: A novel oxygen reduction reaction (ORR) electrode comprising isolated Co atom decorated vertically aligned graphene nanosheets is designed, which can enable the most energy-efficient, rapid acidic H 2 O 2 production in a flow-cell reactor.
SWCNT Networks on Nanoporous Silica Catalyst Support: Morphological and Connectivity Control for Nanoelectronic, Gas-Sensing, and Biosensing Devices
Publisher: American Chemical Society (ACS)
Date: 15-06-2012
DOI: 10.1021/NN302020A
Abstract: Effective control of morphology and electrical connectivity of networks of single-walled carbon nanotubes (SWCNTs) by using rough, nanoporous silica supports of Fe catalyst nanoparticles in catalytic chemical vapor deposition is demonstrated experimentally. The very high quality of the nanotubes is evidenced by the G-to-D Raman peak ratios (>50) within the range of the highest known ratios. Transitions from separated nanotubes on smooth SiO(2) surface to densely interconnected networks on the nanoporous SiO(2) are accompanied by an almost two-order of magnitude increase of the nanotube density. These transitions herald the hardly detectable onset of the nanoscale connectivity and are confirmed by the microanalysis and electrical measurements. The achieved effective nanotube interconnection leads to the dramatic, almost three-orders of magnitude decrease of the SWCNT network resistivity compared to networks of similar density produced by wet chemistry-based assembly of preformed nanotubes. The growth model, supported by multiscale, multiphase modeling of SWCNT nucleation reveals multiple constructive roles of the porous catalyst support in facilitating the catalyst saturation and SWCNT nucleation, consistent with the observed higher density of longer nanotubes. The associated mechanisms are related to the unique surface conditions (roughness, wettability, and reduced catalyst coalescence) on the porous SiO(2) and the increased carbon supply through the supporting porous structure. This approach is promising for the direct integration of SWCNT networks into Si-based nanodevice platforms and multiple applications ranging from nanoelectronics and energy conversion to bio- and environmental sensing.
Pt Single Atom Electrocatalysts at Graphene Edges for Efficient Alkaline Hydrogen Evolution
Publisher: Wiley
Date: 10-07-2022
Abstract: Graphene edges exhibit a highly localized density of states that result in increased reactivity compared to its basal plane. However, exploiting this increased reactivity to anchor and tune the electronic states of single atom catalysts (SACs) remains elusive. To investigate this, a method to anchor Pt SACs with ultra‐low mass loadings at the edges of edge‐rich vertically aligned graphene (as low as 0.71 µg Pt cm –2 ) is developed. Angle‐dependent X‐ray absorption spectroscopy and density‐functional theory calculations reveal that edge‐anchored Pt SACs has a robust coupling with the π‐electrons of graphene. This interaction results in a higher occupancy of the Pt 5d orbital, shifting the d ‐band center toward the Fermi level, improving the adsorption of *H for the hydrogen evolution reaction (HER). Pt primarily coordinated to the graphene edge shows improved alkaline HER performance compared to Pt coordinated in mixed environments (turnover frequencies of 22.6 and 10.9 s –1 at an overpotential of 150 mV, respectively). This work demonstrates an effective route to engineering the coordination environment of Pt SACs by using the graphene edge for enhanced energy conversion reactions.
Uniform Polypyrrole Layer-Coated Sulfur/Graphene Aerogel via the Vapor-Phase Deposition Technique as the Cathode Material for Li–S Batteries
Publisher: American Chemical Society (ACS)
Date: 10-01-2020
Abstract: The practical application of Li-S batteries is h ered because of their poor cycling stability caused by electrolyte-dissolved lithium polysulfides. Dual functionalities such as strong chemical adsorption stability and high conductivity are highly desired for an ideal host material for the sulfur-based cathode. Herein, a uniform polypyrrole layer-coated sulfur/graphene aerogel composite is designed and synthesized using a novel vapor-phase deposition method. The polypyrrole layer simultaneously acts as a host and an adsorbent for efficient suppression of polysulfide dissolution through strong chemical interaction. The density functional theory calculations reveal that the polypyrrole could trap lithium polysulfides through stronger bonding energy. In addition, the deflation of sulfur/graphene hydrogel during the vapor-phase deposition process enhances the contact of sulfur with matrices, resulting in high sulfur utilization and good rate capability. As a result, the synthesized polypyrrole-coated sulfur/graphene aerogel composite delivers specific discharge capacities of 1167 and 409.1 mA h g
Time-dependent electrical double layer with blocking electrode
Publisher: AIP Publishing
Date: 26-01-2009
DOI: 10.1063/1.3077605
Abstract: This paper deals with the experimental observation of time-dependent electrical double layer (EDL) in electrolyte. A potential-distance diagram is used to fully understand different stages in the formation of EDL. The influence of the thickness of the blocking layer and the ionic strength to the formation of EDL is discussed based on the equivalent circuit. With this simple method, it is found that in addition to Debye screening length, the frequency has to be considered if an alternating electric field is used to control the movement of charged biomolecules inside EDL.
Creating ionic pathways in solid-state polymer electrolyte by using PVA-coated carbon nanofibers
Publisher: Elsevier BV
Date: 05-2021
Silica nanoparticles treated by cold atmospheric-pressure plasmas improve the dielectric performance of organicinorganic nanocomposites
Publisher: American Chemical Society (ACS)
Date: 19-04-2012
DOI: 10.1021/AM300300F
Abstract: We report on the application of cold atmospheric-pressure plasmas to modify silica nanoparticles to enhance their compatibility with polymer matrices. Thermally nonequilibrium atmospheric-pressure plasma is generated by a high-voltage radio frequency power source operated in the capacitively coupled mode with helium as the working gas. Compared to the pure polymer and the polymer nanocomposites with untreated SiO(2), the plasma-treated SiO(2)-polymer nanocomposites show higher dielectric breakdown strength and extended endurance under a constant electrical stress. These improvements are attributed to the stronger interactions between the SiO(2) nanoparticles and the surrounding polymer matrix after the plasma treatment. Our method is generic and can be used in the production of high-performance organic-inorganic functional nanocomposites.
Rational design of stable sulfur vacancies in molybdenum disulfide for hydrogen evolution
Publisher: Elsevier BV
Date: 02-2020
Enhanced pH‐Universal Hydrogen Evolution Reactions on the Ru/a–Ni–MoO3 Electrocatalysts
Publisher: Wiley
Date: 27-07-2023
Abstract: Green hydrogen production through the electrocatalytic hydrogen evolution reaction (HER) is a promising solution for transition from fossil fuels to renewable energy. To enable the use of a variety of electrolytes with different pH values, HER catalysts with pH universality are highly desirable but their performance remains mediocre. Herein, a pH‐universal HER catalyst composed of ruthenium nanoparticles decorated on amorphous Ni‐doped MoO 3 ( a –Ni–MoO 3 ) nanowire support is reported, that is, Ru/ a –Ni–MoO 3 , which achieves enhanced performance as compared to the commercial Ru/C catalyst. Electron transfer from Ru to a –Ni–MoO 3 is identified by spectroscopic techniques, which results in a modified electronic structure of the Ru active sites with a reduced electron density of 4 d states near the Fermi level. Density functional theory calculations further reveal that the modulated electronic structure weakens the interactions between the Ru active sites and the reaction intermediates, which facilitates the HER reaction steps including H intermediate desorption and water dissociation. Experimental and theoretical findings provide insight into enhancing pH‐universal HER performance through modulation of electrocatalyst electronic structure.
Carbon fibre electrodes for ultra long cycle life pseudocapacitors by engineering the nano-structure of vertical graphene and manganese dioxides
Publisher: Elsevier BV
Date: 06-2021
Low-temperature plasma assisted growth of vertical graphene for enhancing carbon fibre/epoxy interfacial strength
Publisher: Elsevier BV
Date: 11-2019
MnOx /carbon nanotube/reduced graphene oxide nanohybrids as high-performance supercapacitor electrodes
Publisher: Springer Science and Business Media LLC
Date: 10-2014
DOI: 10.1038/AM.2014.100
Enhancing the Electrochemical Properties of Nickel-Rich Cathode by Surface Coating with Defect-Rich Strontium Titanate
Publisher: American Chemical Society (ACS)
Date: 06-06-2023
Ti–PS nanocomposites by plasma immersion ion implantation and deposition
Publisher: Elsevier BV
Date: 02-2009
High Areal Capacity and Long Cycle Life Flexible Mild Quasi‐Solid‐State Ag–Zn Battery with Dendrite‐Free Anode
Publisher: Wiley
Date: 08-03-2009
DOI: 10.1002/EEM2.12493
Abstract: Silver‐zinc (Ag–Zn) batteries are a promising battery system for flexible electronics owing to their high safety, high energy density, and stable output voltage. However, poor cycling performance, low areal capacity, and inferior flexibility limit the practical application of Ag–Zn batteries. Herein, we develop a flexible quasi‐solid‐state Ag–Zn battery system with superior performance by using mild electrolyte and binder‐free electrodes. Copper foam current collector is introduced to impede the growth of Zn dendrite, and the structure of Ag cathode is engineered by electrodeposition and chloridization process to improve the areal capacity. This novel battery demonstrates a remarkable cycle retention of 90% for 200 cycles at 3 mA cm −2 . More importantly, this binder‐free battery can afford a high capacity of 3.5 mAh cm −2 at 3 mA cm −2 , an outstanding power density of 2.42 mW cm −2 , and a maximum energy density of 3.4 mWh cm −2 . An energy management circuit is adopted to boost the output voltage of a single battery, which can power electronic ink display and Bluetooth temperature and humidity sensor. The developed battery can even operate under the extreme conditions, such as being bent and sealed in solid ice. This work offers a path for designing electrodes and electrolyte toward high‐performance flexible Ag–Zn batteries.
Vanadium doped 1T MoS2 nanosheets for highly efficient electrocatalytic hydrogen evolution in both acidic and alkaline solutions
Publisher: Elsevier BV
Date: 04-2021
Note: Rapid reduction of graphene oxide paper by glow discharge plasma
Publisher: AIP Publishing
Date: 05-2015
DOI: 10.1063/1.4919732
Abstract: This note reports on a novel method for the rapid reduction of graphene oxide (GO) paper using a glow discharge plasma reactor. Glow discharge is produced and sustained between two parallel-plate graphite electrodes at a pressure of 240 mTorr. By exposing GO paper at the junction of negative-glow and Faraday-dark area for 4 min, the oxygen-containing groups can be effectively removed (C/O ratio increases from 2.6 to 7.9), while the material integrality and flexibility are kept well. Electrochemical measurements demonstrate that the as-obtained reduced GO paper can be potentially used for supercapacitor application.
Anti-fouling graphene-based membranes for effective water desalination
Publisher: Springer Science and Business Media LLC
Date: 14-02-2018
DOI: 10.1038/S41467-018-02871-3
Abstract: The inability of membranes to handle a wide spectrum of pollutants is an important unsolved problem for water treatment. Here we demonstrate water desalination via a membrane distillation process using a graphene membrane where water permeation is enabled by nanochannels of multilayer, mismatched, partially overlapping graphene grains. Graphene films derived from renewable oil exhibit significantly superior retention of water vapour flux and salt rejection rates, and a superior antifouling capability under a mixture of saline water containing contaminants such as oils and surfactants, compared to commercial distillation membranes. Moreover, real-world applicability of our membrane is demonstrated by processing sea water from Sydney Harbour over 72 h with macroscale membrane size of 4 cm 2 , processing ~0.5 L per day. Numerical simulations show that the channels between the mismatched grains serve as an effective water permeation route. Our research will pave the way for large-scale graphene-based antifouling membranes for erse water treatment applications.
Physisorption-induced electron scattering on the surface of carbon-metal core-shell nanowire arrays for hydrogen sensing
Publisher: AIP Publishing
Date: 10-06-2013
DOI: 10.1063/1.4811165
Abstract: Palladium is sputtered on multi-walled carbon nanotube forests to form carbon-metal core-shell nanowire arrays. These hybrid nanostructures exhibited resistive responses when exposed to hydrogen with an excellent baseline recovery at room temperature. The magnitude of the response is shown to be tuneable by an applied voltage. Unlike the charge-transfer mechanism commonly attributed to Pd nanoparticle-decorated carbon nanotubes, this demonstrates that the hydrogen response mechanism of the multi-walled carbon nanotube-Pd core-shell nanostructure is due to the increase in electron scattering induced by physisorption of hydrogen. These hybrid core-shell nanostructures are promising for gas detection in hydrogen storage applications.
Ultrathick MoS2 Films with Exceptionally High Volumetric Capacitance
Publisher: Wiley
Date: 27-01-2022
Abstract: Manufacturing electrode films at an industrial‐level submillimeter thickness (≈100 µm) with superior volumetric performance is of practical significance for the commercialization of miniaturized supercapacitor systems. This work proposes a commercially scalable solvated‐ion‐intercalated hydrothermal strategy to demonstrate a record‐high volumetric capacitance (511.29 F cm −3 ) for supercapacitors based on an industrial‐level submillimeter MoS 2 film electrode (94.2 µm). The intercalated solvated Li + ions increase the amount of negative surface charge and reduce the formation energy of 1T MoS 2 , leading to a high metallic phase content of 82.7% with enhanced electrical conductivity. Together with the expanded interlayer distance (≈1.23 nm), this allows rapid electron transfer and ion transport in the excessively stacked ultrathick MoS 2 film to be simultaneously realized. Thus, the as‐fabricated MoS 2 ||graphene/carbon nanotube asymmetric supercapacitor presents both high energy and power densities, outperforms those of commercial devices, including supercapacitors with submillimeter‐thick electrodes and even micrometer‐thick electrodes.
XPS studies on aluminum ions modified polyimide with the PIII technique
Publisher: AIP Publishing
Date: 03-2007
DOI: 10.1063/1.2709578
Abstract: Polyimide s les modified by aluminum (Al) ions produced by filtered cathodic vacuum arc (FCVA) with plasma immersion ion implantation (PIII) technique, under ambient argon and oxygen gases (flow rate Ar:O2=2:1) were investigated by x-ray photoelectron spectroscopy (XPS). The working pressure was about 8×10−4 Torr and the plasma density was estimated to be 109 ions∕cm3. The applied bias voltages were varied from 5 to 12.5 kV but with fixed frequency at 900 Hz and duty time of 15μs. For 1 min process time, C 1s and O 1s spectra for modified s les clearly indicated that the carbonyl group (C=O) was largely destroyed by incident Al ions while Al 2p spectra suggested Al atoms remain inside polyimide matrices in the form of C-O-Al complexes. For a 5 min process time, when the ion fluence became large, both C 1s and O 1s spectra suggested a structure of “aluminum oxide-mixed layer-polyimide” and Al 2p spectra confirmed that most Al atoms were bonded to oxygen atoms on the top surface. These XPS results revealed the chemical bonds between implanted and deposited Al ions and polyimide matrix by using the PIII technique. The structural information can also be suggested. Furthermore in this paper, some discussions with the theoretical [the stopping and range of ions in matter (SRIM)] simulation were also mentioned in order to explore the effectiveness of Al ions irradiation on polyimide.
Revealing ion transport in supercapacitors with Sub-2 nm two-dimensional graphene channels
Publisher: Elsevier BV
Date: 10-2020
Adding a Tuneable Response to a Terahertz Metasurface Using a Graphene Thin Film
Publisher: Springer Science and Business Media LLC
Date: 09-2022
Emerging energy and environmental applications of vertically-oriented graphenes
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4CS00352G
Abstract: This tutorial review summarizes plasma synthesis of vertically-oriented graphenes, their growth mechanisms and unique properties for energy and environmental applications.
Superhydrophobic amorphous carbon/carbon nanotube nanocomposites
Publisher: AIP Publishing
Date: 06-2009
DOI: 10.1063/1.3148667
Abstract: Superhydrophobic amorphous carbon/carbon nanotube nanocomposites are fabricated by plasma immersion ion implantation with carbon nanotube forests as a template. The microstructure of the fabricated nanocomposites shows arrays of carbon nanotubes capped with amorphous carbon nanoparticles. Contact angle measurements show that both advancing and receding angles close to 180° can be achieved on the nanocomposites. The fabrication here does not require patterning of carbon nanotubes or deposition of conformal coatings with low surface energy, which are usually involved in conventional approaches for superhydrophobic surfaces. The relationship between the observed superhydrophobicity and the unique microstructure of the nanocomposites is discussed.
Direct plasma printing of nano-gold from an inorganic precursor
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TC01808E
Abstract: A direct one-step nano-gold printing process from a HAuCl 4 solution precursor is demonstrated using an atmospheric-pressure plasma jet.
Advances in high-voltage supercapacitors for energy storage systems: materials and electrolyte tailoring to implementation
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2NA00863G
Abstract: Supercapacitor is a promising energy storage device for short term energy storage system (ESSs). This review, covers materials and electrolyte tailoring needed to achieve high V supercapacitor, essential for designing an efficient short term ESSs.
High Pseudocapacitive Performance of MnO2 Nanowires on Recyclable Electrodes
Publisher: Wiley
Date: 05-04-2016
Abstract: Manganese oxides are promising pseudocapacitve materials for achieving both high power and energy densities in pseudocapacitors. However, it remains a great challenge to develop MnO2 -based high-performance electrodes due to their low electrical conductance and poor stability. Here we show that MnO2 nanowires anchored on electrochemically modified graphite foil (EMGF) have a high areal capacitance of 167 mF cm(-2) at a discharge current density of 0.2 mA cm(-2) and a high capacitance retention after 5000 charge/discharge cycles (115 %), which are among the best values reported for any MnO2 -based hybrid structures. The EMGF support can also be recycled and the newly deposited MnO2 -based hybrids retain similarly high performance. These results demonstrate the successful preparation of pseudocapacitors with high capacity and cycling stability, which may open a new opportunity towards a sustainable and environmentally friendly method of utilizing electrochemical energy storage devices.
Recent progress in plasma-assisted synthesis and modification of 2D materials
Publisher: IOP Publishing
Date: 16-04-2018
Control of dense carbon nanotube arrays via hierarchical multilayer catalyst
Publisher: AIP Publishing
Date: 03-10-2011
DOI: 10.1063/1.3645625
Abstract: Effective control of dense, high-quality carbon nanotube arrays using hierarchical multilayer catalyst patterns is demonstrated. Scanning/transmission electron microscopy, atomic force microscopy, Raman spectroscopy, and numerical simulations show that by changing the secondary and tertiary layers one can control the properties of the nanotube arrays. The arrays with the highest surface density of vertically aligned nanotubes are produced using a hierarchical stack of iron nanoparticles and alumina and silica layers differing in thickness by one order of magnitude from one another. The results are explained in terms of the catalyst structure effect on carbon diffusivity.
Electronic conductance of ion implanted and plasma modified polymers
Publisher: AIP Publishing
Date: 30-07-2007
DOI: 10.1063/1.2761233
Abstract: The authors used the plasma immersion ion implantation and deposition technique to modify polyethylene terephthalate (PET) and by using conductive atomic force microscope, the spatial distribution of ∼10nm size titanium nanoclusters embedded in PET matrices were observed. The I-V plots showed typical metal-semiconductor junction conductivity between the conductive tip and the surface. In addition, the authors also measured the temperature dependent conductivity and fitted it well to the Mott law, which implied that the conductance arose from electron hopping process. Such technique to create the surface structure of metal olymer nanocomposites may open an alternative way for plastic nanoelectronics.
Lithium sulfide-based cathode for lithium-ion/sulfur battery: Recent progress and challenges
Publisher: Elsevier BV
Date: 05-2019
A novel amperometric biosensor based on ZnO:Co nanoclusters for biosensing glucose
Publisher: Elsevier BV
Date: 08-2007
DOI: 10.1016/J.BIOS.2007.03.014
Abstract: ZnO:Co nanoclusters were synthesized by nanocluster-beam deposition with averaged particle size of 5 nm and porous structure, which were for the first time adopted to construct a novel erometric glucose biosensor. Glucose oxidase was immobilized into the ZnO:Co nanocluster-assembled thin film through Nafion-assisted cross-linking technique. Due to the high specific active sites and high electrocatalytic activity of the ZnO:Co nanoclusters, the constructed glucose biosensor showed a high sensitivity of 13.3 microA/mA cm2. The low detection limit was estimated to be 20 microM (S/N=3) and the apparent Michaelis-Menten constant was found to be 21 mM, indicating the high affinity of the enzyme on ZnO:Co nanoclusters to glucose. The results show that the ZnO:Co nanocluster-assembled thin films with nanoporous structure and nanocrystallites have potential applications as platforms to immobilize enzyme in biosensors.
Atomically Dispersed Cu Catalysts on Sulfide-Derived Defective Ag Nanowires for Electrochemical CO2 Reduction
Publisher: American Chemical Society (ACS)
Date: 02-02-2023
Ambient air synthesis of multi-layer CVD graphene films for low-cost, efficient counter electrode material in dye-sensitized solar cells
Publisher: Elsevier BV
Date: 03-2018
Core-leaf onion-like carbon/MnO2 hybrid nano-urchins for rechargeable lithium-ion batteries
Publisher: Elsevier BV
Date: 11-2013
Defect healing and enhanced nucleation of carbon nanotubes by low-energy ion bombardment
Publisher: American Physical Society (APS)
Date: 05-02-2013
Radiolucent image in lower third molar: hidden caries or pre-eruptive resorption?: a case report
Publisher: FapUNIFESP (SciELO)
Date: 2023
DOI: 10.1590/1981-86372023002620220024
Abstract: ABSTRACT Caries is a multifactorial disease due to the imbalance of the de/re-mineralization process. Complementary radiographic examinations are able to detect hidden caries. The purpose of this short communication was to investigate the radiolucent image suggestive of hidden caries in lower third molar. The extraction of the tooth, decalcification, inclusion and preparation were performed for histological analysis of the lesion. Histological findings revealed a pre-eruptive resorption, and the etiological factors of this coronary resorption were undefined. The professional should be aware of the occurrences of these lesions to early diagnose and propose appropriate treatment to avoid future complications to the patient.
Deterministic control of structural and optical properties of plasma-grown vertical graphene nanosheet networks via nitrogen gas variation
Publisher: The Optical Society
Date: 30-04-2012
DOI: 10.1364/OME.2.000700
Multifunctional graphene micro-islands: Rapid, low-temperature plasma-enabled synthesis and facile integration for bioengineering and genosensing applications
Publisher: Elsevier BV
Date: 03-2017
DOI: 10.1016/J.BIOS.2016.04.072
Abstract: Here, we present a rapid, low-temperature (200°C) plasma-enabled synthesis of graphene micro-islands (GMs). Morphological analyses of GMs by scanning electron microscopy (SEM) and atomic force microscopy (AFM) feature a uniform and open-networked array of aggregated graphene sheets. Structural and surface chemical characterizations by Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) support the presence of thin graphitic edges and reactive oxygen functional groups. We demonstrate that these inherent properties of GMs enable its multifunctional capabilities as a bioactive interface. GMs exhibit a biocompatibility of 80% cell viability with primary fibroblast lung cells after 5 days. Further, GMs were assembled into an impedimetric genosensor, and its performance was characterized by electrochemical impedance spectroscopy (EIS). A dynamic sensing range of 1pM to 1nM is reported, and a limit of quantification (LOQ) of 2.03×10
Oxygen vacancies and band gap engineering of vertically aligned MnO2 porous nanosheets for efficient oxygen evolution reaction
Publisher: Elsevier BV
Date: 10-2021
Structural, optical and electrical properties of Al-doped ZnO transparent conducting oxide for solar cell applications
Publisher: World Scientific Pub Co Pte Lt
Date: 12-2011
DOI: 10.1142/S1793604711002330
Abstract: Al -doped zinc oxide (AZO) thin films are deposited onto glass substrates using radio-frequency reactive magnetron sputtering and the improvements in their physical properties by post-synthesis thermal treatment are reported. X-ray diffraction spectra show that the structure of films can be controlled by adjusting the annealing temperatures, with the best crystallinity obtained at 400°C under a nitrogen atmosphere. These films exhibit improved quality and better optical transmittance as indicated by the UV-Vis spectra. Furthermore, the sheet resistivity is found to decrease from 1.87 × 10 -3 to 5.63 × 10 -4 Ω⋅cm and the carrier mobility increases from 6.47 to 13.43 cm 2 ⋅ V -1 ⋅ s -1 at the optimal annealing temperature. Our results demonstrate a simple yet effective way in controlling the structural, optical and electrical properties of AZO thin films, which is important for solar cell applications.
Atmospheric microplasma-functionalized 3D microfluidic strips within dense carbon nanotube arrays confine Au nanodots for SERS sensing
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3CC00282A
Abstract: An atmospheric microplasma jet produces three-dimensional (3D) microfluidic channels on dense arrays of vertically aligned carbon nanotubes, which confines Au nanodot aqueous solution. The resulting hybrid 3D nanostructure is exploited as an effective microscopic area-selective sensing platform based on surface-enhanced Raman scattering.
Passivation layer on polyimide deposited by combined plasma immersion ion implantation and deposition and cathodic vacuum arc technique
Publisher: American Vacuum Society
Date: 07-03-2007
DOI: 10.1116/1.2712196
Abstract: A thin passivation layer of aluminum oxide was deposited on polyimide by using the combined plasma immersion ion implantation and deposition (PIII& D) and cathodic vacuum arc technique. X-ray photoelectron spectroscopy C 1s spectra showed that the carbonyl bond (CO) and ether group (C–O–C and C–N–C) presented in pristine polyimide were damaged by implantation of aluminum ions and deposition of an aluminum oxide passivation layer. O 1s and Al 2p spectra confirmed the formation of a thin aluminum oxide passivation layer. This passivation layer can be implemented in aerospace engineering where polyimide may suffer degradation from fast atomic oxygen in the low-earth-orbit environment. To test the protection of this passivation layer to energetic oxygen ions, a plasma-enhanced chemical vapor deposition system was used to simulate the oxygen-ion irradiation, and the results showed that a higher weight occurred for passivated s les compared to pristine ones. X-ray diffraction showed that Al peaks were presented on the surface region, but no aluminum oxide peak was detected. The authors then concluded that Al clusters were formed in polyimide besides aluminum oxide, which was in an x-ray amorphous state. Furthermore, contact-angle measurements showed a reduced contact angle for passivated polyimide from a pristine value of 78° to 20° by using deionized water. Several discussions have been made on the surface chemical and structural property changes by using the combined PIII& D and cathodic vacuum arc technique.
Boosting moisture induced electricity generation from graphene oxide through engineering oxygen-based functional groups
Publisher: Elsevier BV
Date: 04-2022
Valence Alignment of Mixed Ni–Fe Hydroxide Electrocatalysts through Preferential Templating on Graphene Edges for Enhanced Oxygen Evolution
Publisher: American Chemical Society (ACS)
Date: 20-06-2020
Rationalized design of hyperbranched trans-scale graphene arrays for enduring high-energy lithium metal batteries
Publisher: American Association for the Advancement of Science (AAAS)
Date: 26-08-2022
Abstract: Lithium (Li) metal anode have shown exceptional potential for high-energy batteries. However, practical cell-level energy density of Li metal batteries is usually limited by the low areal capacity ( mAh cm −2 ) because of the accelerated degradation of high–areal capacity Li metal anodes upon cycling. Here, we report the design of hyperbranched vertical arrays of defective graphene for enduring deep Li cycling at practical levels of areal capacity ( mAh cm −2 ). Such atomic-to-macroscopic trans-scale design is rationalized by quantifying the degradation dynamics of Li metal anodes. High-energy Li metal cells are prototyped under realistic conditions with high cathode capacity ( mAh cm −2 ), low negative-to-positive electrode capacity ratio (1:1), and low electrolyte-to-capacity ratio (5 g Ah −1 ), which shed light on a promising move toward practical Li metal batteries.
Constructing Atomic Heterometallic Sites in Ultrathin Nickel-Incorporated Cobalt Phosphide Nanosheets via a Boron-Assisted Strategy for Highly Efficient Water Splitting
Publisher: American Chemical Society (ACS)
Date: 05-01-2021
Carbon nanotube membranes with ultrahigh specific adsorption capacity for water desalination and purification
Publisher: Springer Science and Business Media LLC
Date: 13-08-2013
DOI: 10.1038/NCOMMS3220
Abstract: Development of technologies for water desalination and purification is critical to meet the global challenges of insufficient water supply and inadequate sanitation, especially for point-of-use applications. Conventional desalination methods are energy and operationally intensive, whereas adsorption-based techniques are simple and easy to use for point-of-use water purification, yet their capacity to remove salts is limited. Here we report that plasma-modified ultralong carbon nanotubes exhibit ultrahigh specific adsorption capacity for salt (exceeding 400% by weight) that is two orders of magnitude higher than that found in the current state-of-the-art activated carbon-based water treatment systems. We exploit this adsorption capacity in ultralong carbon nanotube-based membranes that can remove salt, as well as organic and metal contaminants. These ultralong carbon nanotube-based membranes may lead to next-generation rechargeable, point-of-use potable water purification appliances with superior desalination, disinfection and filtration properties.
Hybrid carbon-based nanostructured platforms for the advanced bioreactors
Publisher: American Scientific Publishers
Date: 12-2015
Abstract: Mankind faces several global challenges such as chronic and acute hunger, global poverty, energy deficiency and environment conservation. Common biotechnologies based on batch, fluidbed and other similar processes are now extensively used for the production of a wide range of products such as antibiotics, biofuels, cultured and fermented food products. Unfortunately, these processes suffer from low efficiency, high energy demand, low controllability and rapid biocatalyst degradation by microbiological attack, and thus still are not capable of seriously addressing the global hunger and energy deficiency challenges. Moreover, sustainable future technologies require minimizing the environmental impact of toxic by-products by implementing the "life produces organic matter, organic matter sustains life" principle. Nanostructure-based biotechnology is one of the most promising approaches that can help to solve these challenges. In this work we briefly review the unique features of the carbon-based nanostructured platforms, with some attention paid to other nanomaterials. We discuss the main building blocks and processes to design and fabricate novel platforms, with a focus on dense arrays of the vertically-aligned nanostructures, mainly carbon nanotubes and graphene. Advantages and disadvantages of these systems are considered.
Structural and wetting properties of metal polymer nanocomposites
Publisher: IEEE
Date: 2008
Greeks on de Quincey’s Chinese stage: Orientalism, opium warfare, and the ‘Theory of Greek Tragedy’
Publisher: Oxford University Press (OUP)
Date: 13-10-2014
DOI: 10.1093/CRJ/CLU019
High-frequency supercapacitors based on doped carbon nanostructures
Publisher: Elsevier BV
Date: 2018
Surface insulation performance of epoxy resin/silica nanocomposite material
Publisher: IEEE
Date: 06-2011
Designing atmospheric-pressure plasma sources for surface engineering of nanomaterials
Publisher: Springer Science and Business Media LLC
Date: 02-02-2013
Biomimetic ultraflexible piezoresistive flow sensor based on graphene nanosheets and PVA hydrogel
Publisher: Wiley
Date: 14-09-2022
Abstract: Flow sensors play a critical role in monitoring flow parameters, including rate, velocity, direction, and rotation frequency. In this paper, inspired by biological hair cells in the human vestibular system, an innovative flow sensor is developed based on polyvinyl alcohol (PVA) hydrogel nanocomposites with a maze‐like network of vertically grown graphene nanosheets (VGNs). The VGNs/PVA hydrogel absorbs a copious amount of water when immersed in water, making the sensor highly sensitive to tiny stimuli underwater. The sensor demonstrates a high sensitivity (5.755 mV (mm s −1 ) −1 ) and extremely low velocity detection (0.022 mm s −1 ). It also reveals outstanding performance in detecting low‐frequency oscillatory flows down to 0.1 Hz, which make it suitable for many biomedical applications. As one of the potential applications of the sensor, it exhibits excellent performance in mimicking various physiological conditions of vestibular hair cells. To explain the experimental results, a complete finite element simulation is developed to model the piezoresistive effect of VGNs/PVA thin film structure. This is the first attempt to develop hydrogel–graphene nanosheet‐based flow sensors, which creates the closest artificial sensor to vestibular hair cells. This miniaturized hair cell sensor paves the way for utilizing hydrogels to develop next‐generation of ultrasensitive flow sensors for biomedical applications.
Fabrication of Carbon Nanotube−Polyaniline Composites via Electrostatic Adsorption in Aqueous Colloids
Publisher: American Chemical Society (ACS)
Date: 23-02-2007
DOI: 10.1021/JP0651844
Biological Application of Carbon Nanotubes and Graphene
Publisher: Elsevier
Date: 2014
Sustainable process for all-carbon electrodes: Horticultural doping of natural-resource-derived nano-carbons for high-performance supercapacitors
Publisher: Elsevier BV
Date: 09-2015
Control of density of self-organized carbon nanotube arrays by catalyst pretreatment through plasma immersion ion implantation
Publisher: AIP Publishing
Date: 11-2011
DOI: 10.1063/1.3657842
Abstract: A simple and effective method of controlling the growth of vertically aligned carbon nanotube arrays in a low-temperature plasma is presented. Ni catalyst was pretreated by plasma immersion ion implantation prior to the nanotube growth by plasma-enhanced chemical vapor deposition. Both the size distribution and the areal density of the catalyst nanoparticles decrease due to the ion-surface interactions. Consequently, the resulting size distribution of the vertically aligned carbon nanotubes is reduced to 50 ∼ 100 nm and the areal density is lowered (by a factor of ten) to 108 cm−2, which is significantly different from the very-high-density carbon nanotube forests commonly produced by thermal chemical vapor deposition. The efficiency of this pretreatment is compared with the existing techniques such as neutral gas annealing and plasma etching. These results are highly relevant to the development of the next-generation nanoelectronic and optoelectronic devices that require effective control of the density of nanotube arrays.
Ruthenium nanocrystal decorated vertical graphene nanosheets@ni foam as highly efficient cathode catalysts for lithium-oxygen batteries
Publisher: Springer Science and Business Media LLC
Date: 07-2016
DOI: 10.1038/AM.2016.91
Improving thermal and electrical stability of silver nanowire network electrodes through integrating graphene oxide intermediate layers
Publisher: Elsevier BV
Date: 04-2020
Development of an ultra-sensitive and flexible piezoresistive flow sensor using vertical graphene nanosheets
Publisher: Springer Science and Business Media LLC
Date: 11-05-2020
DOI: 10.1007/S40820-020-00446-W
Abstract: This paper suggests development of a flexible, lightweight, and ultra-sensitive piezoresistive flow sensor based on vertical graphene nanosheets (VGNs) with a mazelike structure. The sensor was thoroughly characterized for steady-state and oscillatory water flow monitoring applications. The results demonstrated a high sensitivity (103.91 mV (mm/s) −1 ) and a very low-velocity detection threshold (1.127 mm s −1 ) in steady-state flow monitoring. As one of many potential applications, we demonstrated that the proposed VGNs/PDMS flow sensor can closely mimic the vestibular hair cell sensors housed inside the semicircular canals (SCCs). As a proof of concept, magnetic resonance imaging of the human inner ear was conducted to measure the dimensions of the SCCs and to develop a 3D printed lateral semicircular canal (LSCC). The sensor was embedded into the artificial LSCC and tested for various physiological movements. The obtained results indicate that the flow sensor is able to distinguish minute changes in the rotational axis physical geometry, frequency, and litude. The success of this study paves the way for extending this technology not only to vestibular organ prosthesis but also to other applications such as blood/urine flow monitoring, intravenous therapy (IV), water leakage monitoring, and unmanned underwater robots through incorporation of the appropriate packaging of devices.
High-performance hierarchical MnO2/CNT electrode for multifunctional supercapacitors
Publisher: Elsevier BV
Date: 10-2021
Large arrays and networks of carbon nanotubes: morphology control by process parameters
Publisher: InTech
Date: 09-05-2013
DOI: 10.5772/52674
Rejection of harsh pH saline solutions using graphene membranes
Publisher: Elsevier BV
Date: 2021
Controlled electronic transport in single-walled carbon nanotube networks: Selecting electron hopping and chemical doping mechanisms
Publisher: AIP Publishing
Date: 07-06-2010
DOI: 10.1063/1.3449118
Abstract: The electronic transport in both intrinsic and acid-treated single-walled carbon nanotube networks containing more than 90% semiconducting nanotubes is investigated using temperature-dependent resistance measurements. The semiconducting behavior observed in the intrinsic network is attributed to the three-dimensional electron hopping mechanism. In contrast, the chemical doping mechanism in the acid-treated network is found to be responsible for the revealed metal-like linear resistivity dependence in a broad temperature range. This effective method to control the electrical conductivity of single-walled carbon nanotube networks is promising for future nanoscale electronics, thermometry, and bolometry.
RuO2-coated vertical graphene hybrid electrodes for high-performance solid-state supercapacitors
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7TA03355A
Abstract: Solid-state supercapacitors can be fabricated by uniformly coating RuO 2 onto vertical graphene (VG) using a simple, scalable, low-cost and solution-free method. The binder-free RuO 2 /VG hybrid electrodes possess a high areal capacitance, low electrical resistance, good frequency response, and excellent stability, shedding light on the commercialisation of Ru-based energy storage devices.
Carbon nanotubes on nanoporous alumina: From surface mats to conformal pore filling
Publisher: Springer Science and Business Media LLC
Date: 12-08-2014
Abstract: Control over nucleation and growth of multi-walled carbon nanotubes in the nanochannels of porous alumina membranes by several combinations of posttreatments, namely exposing the membrane top surface to atmospheric plasma jet and application of standard S1813 photoresist as an additional carbon precursor, is demonstrated. The nanotubes grown after plasma treatment nucleated inside the channels and did not form fibrous mats on the surface. Thus, the nanotube growth mode can be controlled by surface treatment and application of additional precursor, and complex nanotube-based structures can be produced for various applications. A plausible mechanism of nanotube nucleation and growth in the channels is proposed, based on the estimated depth of ion flux penetration into the channels. PACS 63.22.Np Layered systems 68. Surfaces and interfaces Thin films and nanosystems (structure and non-electronic properties) 81.07.-b Nanoscale materials and structures: fabrication and characterization
Structural and Wetting Properties of Metal Polymer Nanocomposites
Publisher: IEEE
Date: 09-2008
Electrical conductivity of poly(ethylene terephthalate) modified by titanium plasma
Publisher: Wiley
Date: 28-11-2007
DOI: 10.1002/APP.27414
Atomic-layer soft plasma etching of MoS2
Publisher: Springer Science and Business Media LLC
Date: 27-01-2016
DOI: 10.1038/SREP19945
Abstract: Transition from multi-layer to monolayer and sub-monolayer thickness leads to the many exotic properties and distinctive applications of two-dimensional (2D) MoS 2 . This transition requires atomic-layer-precision thinning of bulk MoS 2 without damaging the remaining layers, which presently remains elusive. Here we report a soft, selective and high-throughput atomic-layer-precision etching of MoS 2 in SF 6 + N 2 plasmas with low-energy ( .4 eV) electrons and minimized ion-bombardment-related damage. Equal numbers of MoS 2 layers are removed uniformly across domains with vastly different initial thickness, without affecting the underlying SiO 2 substrate and the remaining MoS 2 layers. The etching rates can be tuned to achieve complete MoS 2 removal and any desired number of MoS 2 layers including monolayer. Layer-dependent vibrational and photoluminescence spectra of the etched MoS 2 are also demonstrated. This soft plasma etching technique is versatile, scalable, compatible with the semiconductor manufacturing processes and may be applicable for a broader range of 2D materials and intended device applications.
Hierarchically structured electrodes for moldable supercapacitors by synergistically hybridizing vertical graphene nanosheets and MnO2
Publisher: Elsevier BV
Date: 02-2021
A facile approach to tailor electrocatalytic properties of MnO2 through tuning phase transition, surface morphology and band structure
Publisher: Elsevier BV
Date: 06-2022
Vertical graphene array for efficient electrocatalytic reduction of oxygen to hydrogen peroxide
Publisher: Elsevier BV
Date: 06-2022
A vertical graphene enhanced Zn–MnO2 flexible battery towards wearable electronic devices
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0TA08775K
Abstract: A multilayer structured cathode for zinc ion batteries is created by using vertical graphene nano-maze to hold MnO 2 and encapsulating with an ionic conductive PEDOT:PSS layer. The new electrode exhibits exceptional capacity and cycle performance.
Atmospheric-pressure plasma- and TRAIL-induced apoptosis in TRAIL-resistant colorectal cancer cells
Publisher: Wiley
Date: 11-02-2015
Erratum: “Time-dependent electrical double layer with blocking electrode” [Appl. Phys. Lett. 94, 043118 (2009)]
Publisher: AIP Publishing
Date: 16-02-2009
DOI: 10.1063/1.3086874
Initial growth of conducting island-like structure on insulating polymer substrate
Publisher: IEEE
Date: 2008
Efficient wettability-controlled electroreduction of CO2 to CO at Au/C interfaces
Publisher: Springer Science and Business Media LLC
Date: 15-06-2020
DOI: 10.1038/S41467-020-16847-9
Abstract: The electrochemical CO 2 reduction reaction (CO 2 RR) represents a very promising future strategy for synthesizing carbon-containing chemicals in a more sustainable way. In spite of great progress in electrocatalyst design over the last decade, the critical role of wettability-controlled interfacial structures for CO 2 RR remains largely unexplored. Here, we systematically modify the structure of gas-liquid-solid interfaces over a typical Au/C gas diffusion electrode through wettability modification to reveal its contribution to interfacial CO 2 transportation and electroreduction. Based on confocal laser scanning microscopy measurements, the Cassie-Wenzel coexistence state is demonstrated to be the ideal three phase structure for continuous CO 2 supply from gas phase to Au active sites at high current densities. The pivotal role of interfacial structure for the stabilization of the interfacial CO 2 concentration during CO 2 RR is quantitatively analysed through a newly-developed in-situ fluorescence electrochemical spectroscopic method, pinpointing the necessary CO 2 mass transfer conditions for CO 2 RR operation at high current densities.
High-voltage insulation organic-inorganic nanocomposites by plasma polymerization
Publisher: MDPI AG
Date: 20-01-2014
DOI: 10.3390/MA7010563
Plasma functionalization of SiO2 nanoparticles for the synthesis of polymer nano-dielectrics
Publisher: IEEE
Date: 07-2012
Performance degradation and mitigation strategies of silver nanowire networks: a review
Publisher: Informa UK Limited
Date: 13-07-2022
Synergistically enhancing the electrical conductivity of carbon fibre reinforced polymers by vertical graphene and silver nanowires
Publisher: Elsevier BV
Date: 05-2023
Enhanced Electrochemical CO2 Reduction of Cu@CuxO Nanoparticles Decorated on 3D Vertical Graphene with Intrinsic sp3-type Defect
Publisher: Wiley
Date: 04-05-2020
Plasma-enabled carbon nanostructures for early diagnosis of neurodegenerative diseases
Publisher: MDPI AG
Date: 25-06-2014
DOI: 10.3390/MA7074896
Structure-controlled, vertical graphene-based, binder-free electrodes from plasma-reformed butter enhance supercapacitor performance
Publisher: Wiley
Date: 03-07-2013
Highly dispersed platinum deposited on nitrogen-doped vertical graphene array for efficient electrochemical hydrogen evolution
Publisher: IOP Publishing
Date: 25-07-2022
Abstract: The electrochemical hydrogen evolution is a key technology for future renewable energy conversion and storage. Platinum is the most efficient catalyst for hydrogen evolution reaction (HER), but its mass activity should be boosted further. Herein, we deposited platinum on nitrogen-doped vertical graphene through an atomic layer deposition method. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy confirmed that the platinum was highly dispersed on the array substrate. On account of the array structure and high dispersion of platinum, the synthesized catalyst exhibited high HER performance with a low overpotential of 42 mV at 10 mA cm −2 and a low Tafel slope of 52.2 mV dec −1 . Significantly, the synthesized catalyst exhibited a high mass activity of 4.45 A mg −1 Pt , which was ∼13 times higher than that of commercial Pt/C.
Synergistic fusion of vertical graphene nanosheets and carbon nanotubes for high-performance supercapacitor electrodes
Publisher: Wiley
Date: 14-05-2014
Abstract: Graphene and carbon nanotubes (CNTs) are attractive electrode materials for supercapacitors. However, challenges such as the substrate-limited growth of CNTs, nanotube bundling in liquid electrolytes, under-utilized basal planes, and stacking of graphene sheets have so far impeded their widespread application. Here we present a hybrid structure formed by the direct growth of CNTs onto vertical graphene nanosheets (VGNS). VGNS are fabricated by a green plasma-assisted method to break down and reconstruct a natural precursor into an ordered graphitic structure. The synergistic combination of CNTs and VGNS overcomes the challenges intrinsic to both materials. The resulting VGNS/CNTs hybrids show a high specific capacitance with good cycling stability. The charge storage is based mainly on the non-Faradaic mechanism. In addition, a series of optimization experiments were conducted to reveal the critical factors that are required to achieve the demonstrated high supercapacitor performance.
Characteristics of epoxy resin/SiO2 nanocomposite insulation: Effects of plasma surface treatment on the nanoparticles
Publisher: American Scientific Publishers
Date: 05-2013
Abstract: The present study compares the effects of two different material processing techniques on modifying hydrophilic SiO2 nanoparticles. In one method, the nanoparticles undergo plasma treatment by using a custom-developed atmospheric-pressure non-equilibrium plasma reactor. With the other method, they undergo chemical treatment which grafts silane groups onto their surface and turns them into hydrophobic. The treated nanoparticles are then used to synthesize epoxy resin-based nanocomposites for electrical insulation applications. Their characteristics are investigated and compared with the pure epoxy resin and nanocomposite fabricated with unmodified nanofillers counterparts. The dispersion features of the nanoparticles in the epoxy resin matrix are examined through scanning electron microscopy (SEM) images. All s les show evidence that the agglomerations are smaller than 30 nm in their diameters. This indicates good dispersion uniformity. The Weibull plot of breakdown strength and the recorded partial discharge (PD) events of the epoxy resin lasma-treated hydrophilic SiO2 nanocomposite (ER/PTI) suggest that the plasma-treated specimen yields higher breakdown strength and lower PD magnitude as compared to the untreated ones. In contrast, surprisingly, lower breakdown strength is found for the nanocomposite made by the chemically treated hydrophobic particles, whereas the PD magnitude and PD numbers remain at a similar level as the plasma-treated ones.
Hybrid graphite film-carbon nanotube platform for enzyme immobilization and protection
Publisher: Elsevier BV
Date: 12-2013
Mechanically-Assisted Electrochemical Production of Graphene Oxide
Publisher: American Chemical Society (ACS)
Date: 11-11-2016
Anchoring Sites Engineering in Single‐Atom Catalysts for Highly Efficient Electrochemical Energy Conversion Reactions
Publisher: Wiley
Date: 03-09-2021
Abstract: Single‐atom catalysts (SACs) have been at the frontier of research field in catalysis owing to the maximized atomic utilization, unique structures and properties. The atomically dispersed and catalytically active metal atoms are necessarily anchored by surrounding atoms. As such, the structure and composition of anchoring sites significantly influence the catalytic performance of SACs even with the same metal element. Significant progress has been made to understand structure–activity relationships at an atomic level, but in‐depth understanding in precisely designing highly efficient SACs for the targeted reactions is still required. In this review, various anchoring sites in SACs are summarized and classified into five different types (doped heteroatoms, defect sites, surface atoms, metal sites, and cavity sites). Then, their impacts on catalytic performance are elucidated for electrochemical reactions based on their distance from the metal center (first coordination shell and beyond). Further, SACs anchored on two typical types of hosts, carbon‐ and metal‐based materials, are highlighted, and the effects of anchoring points on achieving the desirable atomic structure, catalytic performance, and reaction pathways are elaborated. At last, insights and outlook to the SAC field based on current achievements and challenges are presented.
Uniform, dense arrays of vertically aligned, large-diameter single-walled carbon nanotubes
Publisher: American Chemical Society (ACS)
Date: 23-03-2012
DOI: 10.1021/JA300805S
Abstract: Precisely controlled reactive chemical vapor synthesis of highly uniform, dense arrays of vertically aligned single-walled carbon nanotubes (SWCNTs) using tailored trilayered Fe/Al(2)O(3)/SiO(2) catalyst is demonstrated. More than 90% population of thick nanotubes (>3 nm in diameter) can be produced by tailoring the thickness and microstructure of the secondary catalyst supporting SiO(2) layer, which is commonly overlooked. The proposed model based on the atomic force microanalysis suggests that this tailoring leads to uniform and dense arrays of relatively large Fe catalyst nanoparticles on which the thick SWCNTs nucleate, while small nanotubes and amorphous carbon are effectively etched away. Our results resolve a persistent issue of selective (while avoiding multiwalled nanotubes and other carbon nanostructures) synthesis of thick vertically aligned SWCNTs whose easily switchable thickness-dependent electronic properties enable advanced applications in nanoelectronic, energy, drug delivery, and membrane technologies.
Stabilizing the Unstable: Chromium Coating on NiMo Electrode for Enhanced Stability in Intermittent Water Electrolysis
Publisher: American Chemical Society (ACS)
Date: 29-08-2022
Abstract: Hydrogen production through water electrolysis is a promising method to utilize renewable energy in the context of urgent need to phase out fossil fuels. Nickel-molybdenum (NiMo) electrodes are among the best performing non-noble metal-based electrodes for hydrogen evolution reaction in alkaline media (alkaline HER). Albeit exhibiting stable performance in electrolysis at a constant power supply (i.e., constant electrolysis), NiMo electrodes suffer from performance degradation in electrolysis at an intermittent power supply (i.e., intermittent electrolysis), which is emblematic of electrolysis powered directly by renewable energy (such as wind and solar power sources). Here we reveal that NiMo electrodes were oxidized by dissolved oxygen during power interruption, leading to vanishing of metallic Ni active sites and loss of conductivity in MoO
Electrowetting control of Cassie-to-Wenzel transitions in superhydrophobic carbon nanotube-based nanocomposites
Publisher: American Chemical Society (ACS)
Date: 16-09-2009
DOI: 10.1021/NN900846P
Abstract: The possibility of effective control of the wetting properties of a nanostructured surface consisting of arrays of amorphous carbon nanoparticles capped on carbon nanotubes using the electrowetting technique is demonstrated. By analyzing the electrowetting curves with an equivalent circuit model of the solid/liquid interface, the long-standing problem of control and monitoring of the transition between the "slippy" Cassie state and the "sticky" Wenzel states is resolved. The unique structural properties of the custom-designed nanocomposites with precisely tailored surface energy without using any commonly utilized low-surface-energy (e.g., polymer) conformal coatings enable easy identification of the occurrence of such transition from the optical contrast on the nanostructured surfaces. This approach to precise control of the wetting mode transitions is generic and has an outstanding potential to enable the stable superhydrophobic capability of nanostructured surfaces for numerous applications, such as low-friction microfluidics and self-cleaning.
Fabrication of embedded conductive layer in polymer by plasma immersion ion implantation - art. no. 64130v
Publisher: SPIE
Date: 27-12-2007
DOI: 10.1117/12.695666
Highly Selective Metal‐Free Electrochemical Production of Hydrogen Peroxide on Functionalized Vertical Graphene Edges
Publisher: Wiley
Date: 05-11-2022
Abstract: Electrochemical generation of hydrogen peroxide (H 2 O 2 ) is an attractive alternative to the energy‐intensive anthraquinone oxidation process. Metal‐free carbon‐based materials such as graphene show great promise as efficient electrocatalysts in alkaline media. In particular, the graphene edges possess superior electrochemical properties than the basal plane. However, identification and enhancement of the catalytically active sites at the edges remain challenging. Furthermore, control of surface wettability to enhance gas diffusion and promote the performance in bulk electrolysis is largely unexplored. Here, a metal‐free edge‐rich vertical graphene catalyst is synthesized and exhibits a superior performance for H 2 O 2 production, with a high onset potential (0.8 V versus reversible hydrogen electrode (RHE) at 0.1 mA cm −2 ) and 100% Faradaic efficiency at various potentials. By tailoring the oxygen‐containing functional groups using various techniques of electrochemical oxidation, thermal annealing and oxygen plasma post‐treatment, the edge‐bound in‐plane ether‐type (COC) groups are revealed to account for the superior catalytic performance. To manipulate the surface wettability, a simple vacuum‐based method is developed to effectively induce material hydrophobicity by accelerating hydrocarbon adsorption. The increased hydrophobicity greatly enhances gas transfer without compromising the Faradaic efficiency, enabling a H 2 O 2 productivity of 1767 mmol g catalyst −1 h −1 at 0.4 V versus RHE.
Electro-polymerized Polypyrrole Film for Fabrication of Flexible and Slurry-free Polypyrrole-Sulfur-Polypyrrole Sandwich Electrode for the Lithium-Sulfur Battery
Publisher: Elsevier BV
Date: 10-2019
Single-walled carbon nanotube-based polymer monoliths for the enantioselective nano-liquid chromatographic separation of racemic pharmaceuticals
Publisher: Elsevier BV
Date: 09-2014
DOI: 10.1016/J.CHROMA.2014.07.052
Abstract: Single-walled carbon nanotubes were encapsulated into different polymer-based monolithic backbones. The polymer monoliths were prepared via the copolymerization of 20% monomers, glycidyl methacrylate, 20% ethylene glycol dimethacrylate and 60% porogens (36% 1-propanol, 18% 1,4-butanediol) or 16.4% monomers (16% butyl methacrylate, 0.4% sulfopropyl methacrylate), 23.6% ethylene glycol dimethacrylate and 60% porogens (36% 1-propanol, 18% 1,4-butanediol) along with 6% single-walled carbon nanotubes aqueous suspension. The effect of single-walled carbon nanotubes on the chiral separation of twelve classes of pharmaceutical racemates namely α- and β-blockers, antiinflammatory drugs, antifungal drugs, dopamine antagonists, norepinephrine-dopamine reuptake inhibitors, catecholamines, sedative hypnotics, diuretics, antihistaminics, anticancer drugs and antiarrhythmic drugs was investigated. The enantioselective separation was carried out under multimodal elution to explore the chiral recognition capabilities of single-walled carbon nanotubes using reversed phase, polar organic and normal phase chromatographic conditions using nano-liquid chromatography. Baseline separation was achieved for celiprolol, chlorpheniramine, etozoline, nomifensine and sulconazole under multimodal elution conditions. Satisfactory repeatability was achieved through run-to-run, column-to-column and batch-to-batch investigations. Our findings demonstrate that single-walled carbon nanotubes represent a promising stationary phase for the chiral separation and may open the field for a new class of chiral selectors.
Electrically tuneable terahertz metasurface enabled by a graphene/gold bilayer structure
Publisher: Springer Science and Business Media LLC
Date: 20-08-2022
DOI: 10.1038/S43246-022-00279-7
Abstract: Reconfigurable terahertz electronics devices with high tuneability are pivotal for next-generation high speed wireless communication and sensing technologies. Significant challenges exist for realizing these devices, particularly on the design of smart metastructures that can manipulate electromagnetic radiation at the terahertz frequencies and the fabrication of devices with effective tuneability and reconfigurability. Here, we incorporate graphene into a graphene/gold bilayer superimposed metamaterial structure, which enables efficient electrical tuning of terahertz waves. A 0.2 THz frequency-selective absorber is designed and experimentally developed using this graphene/gold bilayer metamaterial approach. The device demonstrates 16 dB litude tuning at 0.2 THz resonance and over 95% broadband modulation at just 6 V bias voltage while maintaining a benchmark high-quality factor resonance performance. The design and fabrication methods presented can be readily applied to produce a myriad of tuneable terahertz devices required for high-speed, reconfigurable THz wireless communication and sensing technologies.
Nanohybrid TiN/Vertical graphene for high-performance supercapacitor applications
Publisher: Elsevier BV
Date: 04-2020
Redox-mediated proton transport of two-dimensional polyaniline-based nanochannels for fast capacitive performance
Publisher: Wiley
Date: 2022
Abstract: Two‐dimensional (2D) materials are being increasingly exploited for ion transport and storage under nanoconfinement. Here we demonstrate distinct ion transport behavior upon potential‐induced redox reaction in 2D tungstate anion cross‐linked polyaniline (TALP) electrode. It is found that, in the neutral electrolyte, SO 4 2− ion serves as the main charge carrier in 2D polyaniline backbone when the electrical double layer charging dominates. While in an acidic electrolyte, proton transport in TALP turns to be the dominant ion behavior that is associated with the proton‐promoting surface redox processes. Moreover, higher capacitance along with better capacitive retention at a high rate is also demonstrated for TALP electrode in acidic electrolyte compared with that in the neutral environment. The results show that 2D nanoionics can be manipulated by applying redox‐active materials to build the nanochannels that allow the regulation of surface charge and chemistry with potential‐specific redox reactions.
Impact of Micropores and Dopants to Mitigate Lithium Polysulfides Shuttle over High Surface Area of ZIF-8 Derived Nanoporous Carbons
Publisher: American Chemical Society (ACS)
Date: 12-05-2020
Polymeric piezoresistive airflow sensor to monitor respiratory patterns
Publisher: The Royal Society
Date: 12-2021
Abstract: Monitoring human respiratory patterns is of great importance as it gives essential information for various medical conditions, e.g. sleep apnoea syndrome and chronic obstructive pulmonary disease and asthma, etc. Herein, we have developed a polymeric airflow sensor based on nanocomposites of vertically grown graphene nanosheets (VGNs) with polydimethylsiloxane (PDMS) and explored their applications in monitoring human respiration. The sensing performance of the VGNs/PDMS nanocomposite was characterized by exposing to a range of airflow rates (20–130 l min −1 ), and a linear performance with high sensitivity and low response time (mostly below 1 s) was observed. To evaluate the experimental results, finite-element simulation models were developed in the COMSOL Multiphysics package. The piezoresistive properties of VGNs/PDMS thin film and fluid–solid interaction were thoroughly studied. Laser Doppler vibrometry measures of sensor tip displacement closely approximated simulated deflection results and validated the dynamic response of the sensor. By comparing the proposed sensor and some other airflow sensors in the literature, it is concluded that the VGNs/PDMS airflow sensor has excellent features in terms of sensor height, detection range and sensitivity. The potential application of the VGNs/PDMS airflow sensor in detecting the respiration pattern of human exercises like walking, jogging and running has been demonstrated.
Atmospheric gas plasma-induced ROS production activates TNF-ASK1 pathway for the induction of melanoma cancer cell apoptosis
Publisher: American Society for Cell Biology (ASCB)
Date: 05-2014
Abstract: Atmospheric gas plasmas (AGPs) are able to selectively induce apoptosis in cancer cells, offering a promising alternative to conventional therapies that have unwanted side effects such as drug resistance and toxicity. However, the mechanism of AGP-induced cancer cell death is unknown. In this study, AGP is shown to up-regulate intracellular reactive oxygen species (ROS) levels and induce apoptosis in melanoma but not normal melanocyte cells. By screening genes involved in apoptosis, we identify tumor necrosis factor (TNF)–family members as the most differentially expressed cellular genes upon AGP treatment of melanoma cells. TNF receptor 1 (TNFR1) antagonist–neutralizing antibody specifically inhibits AGP-induced apoptosis signal, regulating apoptosis signal–regulating kinase 1 (ASK1) activity and subsequent ASK1-dependent apoptosis. Treatment of cells with intracellular ROS scavenger N-acetyl-l-cysteine also inhibits AGP-induced activation of ASK1, as well as apoptosis. Moreover, depletion of intracellular ASK1 reduces the level of AGP-induced oxidative stress and apoptosis. The evidence for TNF-signaling dependence of ASK1-mediated apoptosis suggests possible mechanisms for AGP activation and regulation of apoptosis-signaling pathways in tumor cells.
Conformal carbon coating on WS2 nanotubes for excellent electrochemical performance of lithium-ion batteries
Publisher: IOP Publishing
Date: 16-11-2019
Abstract: WS
Current control in the magnetron systems for nanofabrication: A comparison
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2012
Single-step, plasma-enabled reforming of natural precursors into vertical graphene electrodes with high areal capacitance
Publisher: American Chemical Society (ACS)
Date: 19-02-2015
DOI: 10.1021/SC500806S
Surface Functionalization of Electrodes and Synthesis of Dual-Phase Solid Electrolytes for Structural Supercapacitors
Publisher: American Chemical Society (ACS)
Date: 27-06-2022
Abstract: The interface between structural electrodes and solid electrolytes plays a key role in the electrical-mechanical properties of energy storage structures. Herein, we present a surface functionalization method to improve the ion conduction efficiency at the interface between a structural electrode and a solid electrolyte that consists of a bi-continuous network of epoxy and ionic liquid (IL). Composite supercapacitors made with this electrolyte and carbon fiber (CF) electrodes coated with manganese dioxide (MnO
WO 3 nanolayer coated 3D-graphene/sulfur composites for high performance lithium/sulfur batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8TA11646F
Abstract: WO 3 /graphene composite minimizes the polysulfide dissolution problem in the lithium–sulfur (Li–S) battery systems while exhibiting an excellent battery performance.
Controlled Growth of Single-Walled Carbon Nanotube Networks by Catalyst Interfacial Diffusion
Publisher: Wiley
Date: 07-03-2014
Gel polymer dominated ion charging mechanisms within graphene nanochannels
Publisher: Elsevier BV
Date: 09-2022
Plasma Enabled Synthesis and Processing of Materials for Lithium-Ion Batteries
Publisher: Wiley
Date: 25-07-2018
Controlled electroluminescence of n-ZnMgO/p-GaN light-emitting diodes
Publisher: AIP Publishing
Date: 24-12-2012
DOI: 10.1063/1.4773367
Abstract: Effective control of room-temperature electroluminescence of n-ZnMgO -GaN light-emitting diodes (LEDs) over both emission intensity and wavelength is demonstrated. With varied Mg concentration, the intensity of LEDs in the near-ultraviolet region is increased due to the effective radiative recombination in the ZnMgO layer. Furthermore, the emission wavelength is shifted to the green/yellow spectral region by employing an indium-tin-oxide thin film as the dopant source, where thermally activated indium diffusion creates extra deep defect levels for carrier recombination. These results clearly demonstrate the effectiveness of controlled metal incorporation in achieving high energy efficiency and spectral tunability of the n-ZnMgO -GaN LED devices.
Reinforced insulation properties of epoxy resin/SiO2 nanocomposites by atmospheric pressure plasma modification
Publisher: IEEE
Date: 06-2012
Plasma nanofabrication and nanomaterials safety
Publisher: IOP Publishing
Date: 14-04-2011
DOI: 10.1088/0022-3727/44/17/174019
Abstract: The fast advances in nanotechnology have raised increasing concerns related to the safety of nanomaterials when exposed to humans, animals and the environment. However, despite several years of research, the nanomaterials safety field is still in its infancy owing to the complexities of structural and surface properties of these nanomaterials and organism-specific responses to them. Recently, plasma-based technology has been demonstrated as a versatile and effective way for nanofabrication, yet its health and environment-benign nature has not been widely recognized. Here we address the environmental and occupational health and safety effects of various zero- and one-dimensional nanomaterials and elaborate the advantages of using plasmas as a safe nanofabrication tool. These advantages include but are not limited to the production of substrate-bound nanomaterials, the isolation of humans from harmful nanomaterials, and the effective reforming of toxic and flammable gases. It is concluded that plasma nanofabrication can minimize the hazards in the workplace and represents a safe way for future nanofabrication technologies.
Bimetallic RuNi-decorated Mg-CUK-1 for oxygen-tolerant carbon dioxide capture and conversion to methane
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2NR03338K
Abstract: A metal–organic framework, known as Mg-CUK-1, is loaded with Ru and Ni nanoparticles and evaluated as a hybrid sorbent/catalyst for the integrated capture and conversion of carbon dioxide to methane under temperature-swing operating conditions.
Reconstructing Cu Nanoparticle Supported on Vertical Graphene Surfaces via Electrochemical Treatment to Tune the Selectivity of CO2 Reduction toward Valuable Products
Publisher: American Chemical Society (ACS)
Date: 07-04-2022
Effect of hydrophilicity of carbon nanotube arrays on the release rate and activity of recombinant human bone morphogenetic protein-2
Publisher: IOP Publishing
Date: 21-06-2011
DOI: 10.1088/0957-4484/22/29/295712
Abstract: Novel nanostructures such as vertically aligned carbon nanotube (CNT) arrays have received increasing interest as drug delivery carriers. In the present study, two CNT arrays with extreme surface wettabilities are fabricated and their effects on the release of recombinant human bone morphogenetic protein-2 (rhBMP-2) are investigated. It is found that the superhydrophilic arrays retained a larger amount of rhBMP-2 than the superhydrophobic ones. Further use of a poloxamer diffusion layer delayed the initial burst and resulted in a greater total amount of rhBMP-2 released from both surfaces. In addition, rhBMP-2 bound to the superhydrophilic CNT arrays remained bioactive while they denatured on the superhydrophobic surfaces. These results are related to the combined effects of rhBMP-2 molecules interacting with poloxamer and the surface, which could be essential in the development of advanced carriers with tailored surface functionalities.
Three-dimensional hierarchical NiCo2O4nanowire@Ni3S2nanosheet core/shell arrays for flexible asymmetric supercapacitors
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6NR02600A
Abstract: Three-dimensional (3D) hierarchical NiCo2O4@Ni3S2 core/shell arrays on Ni foam were synthesized by a facile, stepwise synthesis approach. The 3D heterogeneous NiCo2O4 nanostructure forms an interconnected web-like scaffold and serves as the core for the Ni3S2 shell. The as-prepared NiCo2O4@Ni3S2 nanowire array (NWA) electrodes exhibited excellent electrochemical performance, such as high specific areal capacitance and excellent cycling stability. The specific areal capacitance of 3.0 F cm(-2) at a current density of 5 mA cm(-2) is among the highest values and the only 6.7% capacitance decay after 10 000 cycles demonstrates the excellent cycling stability. A flexible asymmetric supercapacitor (ASC) was fabricated with activated carbon (AC) as the anode and the obtained NiCo2O4@Ni3S2 NWAs as the cathode. The ASC device exhibited a high energy density of 1.89 mW h cm(-3) at 5.81 W cm(-3) and a high power density of 56.33 W cm(-3) at 0.94 mW h cm(-3). As a result, the hybrid nanoarchitecture opens a new way to design high performance electrodes for electrochemical energy storage applications.
MoS2-coated vertical graphene nanosheet for high-performance rechargeable lithium-ion batteries and hydrogen production
Publisher: Springer Science and Business Media LLC
Date: 05-2016
DOI: 10.1038/AM.2016.44
NO2 gas sensing with polyaniline nanofibers synthesized by a facile aqueous/organic interfacial polymerization
Publisher: Elsevier BV
Date: 10-04-2007
Electric field modulated ion-sieving effects of graphene oxide membranes
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0TA09109J
Abstract: Precise and selective separation of ions using two-dimensional (2D) laminar membranes is a budding research field with potential applications in water treatment, desalination, sensing, biomimicry and energy storage.
Hierarchical multilevel arrays of self-assembled gold nanoparticles: Control of resistivity-temperature dependence
Publisher: AIP Publishing
Date: 18-10-2010
DOI: 10.1063/1.3504260
Abstract: The possibility to control the electric resistivity-temperature dependence of the nanosized resistive components made using hierarchical multilevel arrays of self-assembled gold nanoparticles prepared by multiple deposition/annealing is demonstrated. It is experimentally shown that the hierarchical three-level patterns, where the nanoparticles of sizes ranging from several nanometers to several tens of nanometer play a competitive roles in the electric conductivity, demonstrate sharp changes in the activation energy. These patterns can be used for the precise tuning of the resistivity-temperature behavior of nanoelectronic components.
Structure and wetting properties of metal polymer nanocomposites
Publisher: Inderscience Publishers
Date: 2009
Protein retention on plasma-treated hierarchical nanoscale gold-silver platform
Publisher: Springer Science and Business Media LLC
Date: 26-08-2015
DOI: 10.1038/SREP13379
Abstract: Dense arrays of gold-supported silver nanowires of about 100 nm in diameter grown directly in the channels of nanoporous aluminium oxide membrane were fabricated and tested as a novel platform for the immobilization and retention of BSA proteins in the microbial-protective environments. Additional treatment of the silver nanowires using low-temperature plasmas in the inductively-coupled plasma reactor and an atmospheric-pressure plasma jet have demonstrated that the morphology of the nanowire array can be controlled and the amount of the retained protein may be increased due to the plasma effect. A combination of the neutral gold sublayer with the antimicrobial properties of silver nanowires could significantly enhance the efficiency of the platforms used in various biotechnological processes.
Dielectric performance of nanocomposites synthesized by poly(ethylene oxide)-like film coated silica nanoparticles by plasma polymerization
Publisher: IEEE
Date: 06-2013
Supercapacitors based on camphor-derived meso/macroporous carbon sponge electrodes with ultrafast frequency response for ac line-filtering
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA03012A
Abstract: Supercapacitor electrodes assembled from meso/macroporous c hor-derived carbon sponges show highly promising performance in ac line-filtering.
Catalyst engineering for lithium ion batteries: The catalytic role of Ge in enhancing the electrochemical performance of SnO2 (GeO2 )0.13 /G anodes
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4NR04736B
Abstract: The catalytic role of Ge promotes the reversible electrochemical reaction of SnO 2 to Sn, overcoming the limitation of the traditional specific capacity of SnO 2 .
Plasma-enabled sustainable elemental lifecycles: Honeycomb-derived graphenes for next-generation biosensors and supercapacitors
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4GC02135E
Abstract: Vertical graphene nanosheets (VGS) transformed from honeycomb are used for high-performance supercapacitors and selective detection of amyloid-beta (Aβ) species.
Plasma polymer-coated on nanoparticles to improve dielectric and electrical insulation properties of nanocomposites
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2014
Carbon fiber reinforced Zn–MnO2 structural composite batteries
Publisher: Elsevier BV
Date: 06-2021
Electrodeposited cobalt sulfide on a vertical graphene nanocomposite for high-performance supercapacitors
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1NJ03777C
Abstract: A novel cobalt sulfide/vertical graphene (CoS/VG) composite electrode was fabricated via a facile electrodeposition method for high-performance supercapacitor application.
MXene-Based Electrodes for Supercapacitor Energy Storage
Publisher: American Chemical Society (ACS)
Date: 15-02-2021
Graphene microfabrication for developing mm-wave and THz devices
Publisher: IEEE
Date: 09-2019
Tuneable fluidics within graphene nanogaps for water purification and energy storage
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6NH00167J
Abstract: An effective, dry-climate natural plant-inspired approach for controlled surface engineering and liquid–solid interactions within graphene-based sub-micrometer confined spaces.
Ultrasensitive and Stretchable Strain Sensors Based on Mazelike Vertical Graphene Network
Publisher: American Chemical Society (ACS)
Date: 26-09-2018
Abstract: Here, we report a new type of strain sensors consisting of vertical graphene nanosheets (VGNs) with mazelike network, sandwiched between poly(dimethylsiloxane) (PDMS) substrates. The new sensors outperform most graphene thin-film-based sensors reported previously and show an outstanding combination of high stretchability of ∼120%, excellent linearity over the entire detection range, and high sensitivity with a gauge factor of ∼32.6. The sensitivity can be tuned by controlling the thickness of VGNs, with sensors consisting of thicker VGNs showing higher sensitivity but slightly lower stretchability (the maximum gauge factor is ∼88.4 with a maximum detection strain of ∼55%). Detailed microscopic examinations reveal that the ultrahigh sensitivity stems from the formation of microcracks initiated in the buffer layer. These microcracks are bridged by strings of graphene/PDMS, enabling the conductive network to continue to function up to a strain level significantly higher than that of previously reported graphene thin-film-based sensors. Furthermore, the present sensors have been found to be insensitive to temperatures and various liquids, including water and 0.1 mol L
Related Organisations
Universidade Federal Dos Vales Do Jequitinhonha E Mucuri
Location: Brazil
Related Funding Activities
Discovery Early Career Researcher Award
Start Date: 2013
End Date: 2016
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP230101040
Start Date: 02-2023
End Date: 02-2026
Amount: $516,000.00
Funder: Australian Research Council
View Funded ActivityARC Future Fellowships - Grant ID: FT220100209
Start Date: 02-2023
End Date: 02-2027
Amount: $947,616.00
Funder: Australian Research Council
View Funded ActivityIndustrial Transformation Research Hubs - Grant ID: IH210100040
Start Date: 08-2022
End Date: 07-2027
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View Funded ActivityDiscovery Early Career Researcher Award - Grant ID: DE130101264
Start Date: 06-2013
End Date: 05-2016
Amount: $375,000.00
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View Funded Activity