ORCID Profile
0000-0001-9059-3839
Current Organisation
University of 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)
Functional materials | Electrochemistry | Nanomaterials | Functional Materials | Materials Engineering | Nanofabrication, Growth and Self Assembly | Bioinorganic chemistry | Materials engineering | Catalysis and mechanisms of reactions | Catalysis and Mechanisms of Reactions | Hybrid Vehicles and Powertrains | Synthesis of Materials | Nanoscale Characterisation | Inorganic chemistry | Physical chemistry | Nanomanufacturing | Energy Generation, Conversion and Storage Engineering | Nanotechnology | Mechanical Engineering | Solid state chemistry | Electrochemical energy storage and conversion
ANZSRC Socio-Economic Objective (SEO)
Energy Storage (excl. Hydrogen) | Expanding Knowledge in the Chemical Sciences | Synthetic Fibres, Yarns and Fabrics | Solar-Photovoltaic Energy | Industrial Chemicals and Related Products not elsewhere classified | Consumer Electronic Equipment (excl. Communication Equipment) | Expanding Knowledge in Engineering |
Related Links
Publications
Effect of Centrifugation on the Purity of Single-Walled Carbon Nanotubes from MCM-41 Containing Cobalt
Publisher: American Chemical Society (ACS)
Date: 16-10-2008
DOI: 10.1021/JP807028M
Assemble 2D redox-active covalent organic framework/graphene hybrids as high-performance capacitive materials
Publisher: Elsevier BV
Date: 04-2022
Nanocarbon materials in water disinfection: state-of-the-art and future directions
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9NR02007A
Abstract: The major modes of using nanocarbon materials for water disinfection: hydrogel filters, filtration membranes, recyclable aggregates, electrochemical devices, and photocatalysts.
(n,m) selectivity of single-walled carbon nanotubes by different carbon precursors on Co-Mo catalysts
Publisher: American Chemical Society (ACS)
Date: 30-06-2007
DOI: 10.1021/JA070808K
Abstract: Single walled carbon nanotubes (SWCNTs) were synthesized using four different carbon precursors including CO, C2H5OH, CH3OH, and C2H2 on Co-Mo catalysts. Semiconducting (n,m) abundance was evaluated by a method based on a single-particle tight-binding theoretical model taking into consideration the relative photoluminescence and absorption quantum efficiency for specific (n,m) tubes. (n,m) abundance determined in photoluminescence analysis was used to reconstruct the near-infrared Es11 absorption spectra. Carbon precursor pressure was found to be the key factor to the chirality control in this study. Narrowly (n,m) distributed SWCNTs can only be obtained under high-pressure CO or vacuumed C2H5OH and CH3OH. The majority of these nanotubes are predominately in the same higher chiral-angle region. The carbon precursor chemistry may also play an important role to obtain narrowly (n,m) distributed SWCNTs. (n,m) selectivity on Co-Mo catalysts shifts under different carbon precursors providing the route for (n,m) specific SWCNTs production.
Carbon composite membranes for thermal-driven membrane processes
Publisher: Elsevier BV
Date: 07-2021
Carbon nanomaterials for advancing separation membranes: A strategic perspective
Publisher: Elsevier BV
Date: 11-2016
High-performance Fe–N–C electrocatalysts with a “chain mail” protective shield
Publisher: Elsevier BV
Date: 12-2021
Assembly of pi-functionalized quaternary ammonium compounds with graphene hydrogel for efficient water disinfection
Publisher: Elsevier BV
Date: 02-2019
DOI: 10.1016/J.JCIS.2018.09.084
Abstract: Graphene hydrogels hold great potential for the disinfection of bacteria-contaminated water. However, the intrinsic antibacterial activity of graphene hydrogels is not satisfactory, and the incorporation of other antibacterial agents often results in their unwanted releases. Here, we present a new strategy to improve the antibacterial activities of graphene hydrogels. We first synthesized a new pi-conjugated molecule containing five aromatic rings and two side-linked quaternary ammonium (QA) groups, denoted as piQA. Next, we fabricated composite gravity filters by assembling piQA with reduced graphene oxide (rGO) hydrogel. The rGO hydrogel helps to form a sponge-like physical sieve, contributes to the overall antibacterial activity, and provides abundant pi-rich surfaces. The large aromatic cores of piQA allow the formation of collectively strong pi-pi interactions with rGO, resulting in a high piQA mass loading of ∼31 wt%. Due to the sieving effect of rGO hydrogel and the synergistic antibacterial activity of rGO and piQA, the filters prepared based on piQA-rGO assemblies can remove over 99.5% of Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. aureus) cells with a high-water treatment capacity of 10 L g
Degradation of carbon materials in electrocatalysis
Publisher: Elsevier BV
Date: 12-2022
Hybrid ternary rice paper-manganese oxide-carbon nanotube nanocomposites for flexible supercapacitors
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3NR03010E
Abstract: Modern portable electronic devices create a strong demand for flexible energy storage devices. Paper based nanocomposites are attractive as sustainable materials for such applications. Here, we directly explored the hydroxyl chemistry of cellulose fibers to synthesize hybrid ternary nanocomposites, comprised of rice paper, single-walled carbon nanotubes (SWCNTs) and manganese oxide nanoparticles. The functional groups on cellulose fibers can react with adsorbed permanganate ions, resulting in uniform deposition of manganese oxide nanoparticles. SWCNTs coated on top of manganese oxide nanoparticles form a highly conductive network connecting in idual manganese oxide particles. By using the hybrid ternary composites as electrodes, the assembled two-electrode supercapacitors demonstrated high capacitance (260.2 F g(-1)), energy (9.0 W h kg(-1)), power (59.7 kW kg(-1)), and cycle stability (12% drop after 3000 cycles). In addition, the nanocomposites show good strength and excellent mechanical flexibility, and their capacitance shows negligible changes after bending more than 100 times. These findings suggest that opportunities exist to further explore the rich chemistry of cellulose fibers for innovative energy applications.
Synergism of Water Shock and a Biocompatible Block Copolymer Potentiates the Antibacterial Activity of Graphene Oxide
Publisher: Wiley
Date: 28-12-2015
Abstract: Graphene oxide (GO) is promising in the fight against pathogenic bacteria. However, the antibacterial activity of pristine GO is relatively low and concern over human cytotoxicity further limits its potential. This study demonstrates a general approach to address both issues. The developed approach synergistically combines the water shock treatment (i.e., a sudden decrease in environmental salinity) and the use of a biocompatible block copolymer (Pluronic F-127) as a synergist co-agent. Hypoosmotic stress induced by water shock makes gram-negative pathogens more susceptible to GO. Pluronic forms highly stable nanoassemblies with GO (Pluronic-GO) that can populate around bacterial envelopes favoring the interactions between GO and bacteria. The antibacterial activity of GO at a low concentration (50 μg mL(-1) ) increases from 99%) when complemented with water shock and Pluronic (5 mg mL(-1) ) at ≈2-2.5 h of exposure. Results suggest that the enhanced dispersion of GO and the osmotic pressure generated on bacterial envelopes by polymers together potentiate GO. Pluronic also significantly suppresses the toxicity of GO toward human fibroblast cells. Fundamentally, the results highlight the crucial role of physicochemical milieu in the antibacterial activity of GO. The demonstrated strategy has potentials for daily-life bacterial disinfection applications, as hypotonic Pluronic-GO mixture is both safe and effective.
Lateral dimension-dependent antibacterial activity of graphene oxide sheets
Publisher: American Chemical Society (ACS)
Date: 06-08-2012
DOI: 10.1021/LA3023908
Abstract: Graphene oxide (GO) is a promising precursor to produce graphene-family nanomaterials for various applications. Their potential health and environmental impacts need a good understanding of their cellular interactions. Many factors may influence their biological interactions with cells, and the lateral dimension of GO sheets is one of the most relevant material properties. In this study, a model bacterium, Escherichia coli ( E. coli ), was used to evaluate the antibacterial activity of well-dispersed GO sheets, whose lateral size differs by more than 100 times. Our results show that the antibacterial activity of GO sheets toward E. coli cells is lateral size dependent. Larger GO sheets show stronger antibacterial activity than do smaller ones, and they have different time- and concentration-dependent antibacterial activities. Large GO sheets lead to most cell loss after 1 h incubation, and their concentration strongly influences antibacterial activity at relative low concentration (<10 μg/mL). In contrast, when incubating with small GO sheets up to 4 h, the inactivation rate of E. coli cells continues increasing. The increase of small GO sheet concentration also results in persistent increases in their antibacterial activity. In this study, GO sheets with different lateral sizes are all well dispersed, and their oxidation capacity toward glutathione is similar, consistent with X-ray photoelectron spectroscopy and ultraviolet-visible absorption spectroscopy results. This suggests the lateral size-dependent antibacterial activity of GO sheets is caused by neither their aggregation states, nor oxidation capacity. Atomic force microscope analysis of GO sheets and cells shows that GO sheets interact strongly with cells. Large GO sheets more easily cover cells, and cells cannot proliferate once fully covered, resulting in the cell viability loss observed in the followed colony counting test. In contrast, small GO sheets adhere to the bacterial surfaces, which cannot effectively isolate cells from environment. This study highlights the importance of tailoring the lateral dimension of GO sheets to optimize the application potential with minimal risks for environmental health and safety.
Thiocyanate Modified Silver Nanofoam for Efficient CO2 Reduction to CO
Publisher: American Chemical Society (ACS)
Date: 20-12-2020
Polycondensation of a Perylene Bisimide Derivative and L-Malic Acid as Water-Soluble Conjugates for Fluorescent Labeling of Live Mammalian Cells
Publisher: MDPI AG
Date: 22-05-2018
Synthesis of large pore-diameter SBA-15 mesostructured spherical silica and its application in ultra-high-performance liquid chromatography
Publisher: Elsevier BV
Date: 11-2009
DOI: 10.1016/J.CHROMA.2009.09.013
Abstract: A modified synthesis approach for spherical large pore-diameter SBA-15 mesoporous silica (SLP-SBA-15) with particle size range of 0.5-1microm was being reported. It was worth mentioning that in this improved methodology, the use of cetyltrimethylammonium bromide (CTAB) as co-template significantly reduced the self-assembly time from 24h to 45min. Moreover, under reflux condition, the reaction time could be further shortened by reducing the aging time from 48h to 6h. The resultant SLP-SBA-15 was thereafter successfully functionalized and packed into an ultra-high-performance liquid chromatography (UHPLC) column for the separation of aromatic compounds. A variety of characterizations demonstrated that the silica products exhibited a well-ordered 2d hexagonal mesostructure with well-formed spherical morphology. pore-diameter can be enlarged up to 8.2nm without affecting the structural order. The SLP-SBA-15 s les showed excellent thermal and hydrothermal stabilities. The octadecyltriethoxysilane functionalized SLP-SBA-15 (SLP-C18-SBA-15) was demonstrated to be an effective stationary phase in UHPLC application because the column exhibited significantly reduced column pressure (2800psi) at a flow rate of 0.4ml/min. Accordingly, it would afford greater flexibility for tuning of the flow rate to meet the fast separation requirement.
Charge-induced conductance modulation of carbon nanotube field effect transistor memory devices
Publisher: Elsevier BV
Date: 11-2009
Defective crystalline molybdenum phosphides as bifunctional catalysts for hydrogen evolution and hydrazine oxidation reactions during water splitting
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9QI01005J
Abstract: Defect-rich crystalline molybdenum phosphide nanoparticles anchored on reduced graphene oxide serve as an efficient bifunctional electrocatalyst for both hydrogen evolution and hydrazine oxidation reactions.
(9,8) Single-Walled Carbon Nanotube Enrichment via Aqueous Two-Phase Separation and Their Thin-Film Transistor Applications
Publisher: Wiley
Date: 15-10-2015
Ultrathin nickel boride nanosheets anchored on functionalized carbon nanotubes as bifunctional electrocatalysts for overall water splitting
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8TA09130G
Abstract: Carbon nanotubes increase electrochemically active surface area and reduce charge transfer resistance of transition metal borides.
A review of rechargeable batteries for portable electronic devices
Publisher: Wiley
Date: 03-2019
DOI: 10.1002/INF2.12000
Reactive Sites for Chiral Selective Growth of Single-Walled Carbon Nanotubes: A DFT Study of Ni55–Cn Complexes
Publisher: American Chemical Society (ACS)
Date: 09-11-2012
DOI: 10.1021/JP308115F
Abstract: The physical and electronic properties of single-walled carbon nanotubes (SWCNTs) are determined by their chirality. The chirality selection mechanism in SWCNT growth is not fully understood. In this study, the interaction between near-armchair (n,5), where n = 6, 7, 8, and 9, zigzag (9,0), and armchair (5,5) nanotubes and a fully relaxed Ni(55) metal cluster during the early stage of growth is studied by density functional theory calculations. We found that kink sites at the end edge of (n,5) nanotubes are more reactive than other sites based on the charge transfer analysis at the Ni-C interface. The frontier orbitals of the (6,5) and (7,5) caps are localized on their kink-step sites, which stretch outward from the carbon cap surface, having typical 2p(z) orbital feature of carbon atom with high reactivity. Such favorable frontier orbital spatial orientation and location is ideal to incorporate more carbon species. These reactive sites may lead to the faster growth rate, resulting in the chirality selectivity toward the (6,5) and (7,5) nanotubes. In contrast, the frontier orbitals of (8,5) and (9,5) caps spread over the entire carbon cap surface. Adding carbon species at these sites may lead to the chirality change or formation of other carbon structures. Our results showed that the spatial distribution and orientation of frontier orbitals is useful in explaining the chiral selectivity. Engineering catalyst clusters to control these reactive sites has high potential to further improve chirality control in SWCNT synthesis.
Incorporation of single-wall carbon nanotubes into an organic polymer monolithic stationary phase for μ-HPLC and capillary electrochromatography
Publisher: American Chemical Society (ACS)
Date: 28-01-2005
DOI: 10.1021/AC048299H
Abstract: Single-wall carbon nanotubes (SWNT) were incorporated into an organic polymer monolith containing vinylbenzyl chloride (VBC) and ethylene dimethacrylate (EDMA) to form a novel monolithic stationary phase for high-performance liquid chromatography (HPLC) and capillary electrochromatography (CEC). The retention behavior of neutral compounds on this poly(VBC-EDMA-SWNT) monolith was examined by separating a mixture of small organic molecules using micro-HPLC. The result indicated that incorporation of SWNT enhanced chromatographic retention of small neutral molecules in reversed-phase HPLC presumably because of their strongly hydrophobic characteristics. The stationary phase was formed inside a fused-silica capillary whose lumen was coated with covalently bound polyethyleneimine (PEI). The annular electroosmotic flow (EOF) generated by the PEI coating allowed peptide separation by CEC in the counterdirectional mode. Comparison of peptide separations on poly(VBC-EDMA-SWNT) and on poly(VBC-EDMA) with annular EOF generation revealed that the incorporation of SWNT into the monolithic stationary phase improved peak efficiency and influenced chromatographic retention. The structures of pretreated SWNT and poly(VBC-EDMA-SWNT) monolith were examined by high-resolution transmission electron microscopy, Raman spectroscopy, scanning electron microscopy, and multipoint BET nitrogen adsorption/desorption.
CoSO4/SiO2 catalyst for selective synthesis of (9, 8) single-walled carbon nanotubes: Effect of catalyst calcination
Publisher: Elsevier BV
Date: 04-2013
Toward Flexible Zinc‐Ion Hybrid Capacitors with Superhigh Energy Density and Ultralong Cycling Life: The Pivotal Role of ZnCl 2 Salt‐Based Electrolytes
Publisher: Wiley
Date: 03-11-2021
Abstract: Zinc ion hybrid capacitors (ZIHCs) are promising energy storage devices for emerging flexible electronics, but they still suffer from trade‐off in energy density and cycling life. Herein, we show that such a dilemma can be well‐addressed by deploying ZnCl 2 based electrolytes. Combining experimental studies and density functional theory (DFT) calculations, for the first time, we demonstrate an intriguing chloride ion (Cl − ) facilitated desolvation mechanism in hydrated [ZnCl] + (H 2 O) n−1 (with n=1–6) clusters. Based on this mechanism, a water‐in‐salt type hydrogel electrolyte filled with ZnCl 2 was developed to concurrently improve the energy storage capacity of porous carbon materials and the reversibility of Zn metal electrode. The resulting ZIHCs deliver a battery‐level energy density up to 217 Wh kg −1 at a power density of 450 W kg −1 , an unprecedented cycling life of 100 000 cycles, together with excellent low‐temperature adaptability and mechanical flexibility.
Differentiation of gas molecules using flexible and all-carbon nanotube devices
Publisher: American Chemical Society (ACS)
Date: 2008
DOI: 10.1021/JP710362R
Tuning crystallization and morphology of zinc oxide with polyvinylpyrrolidone: Formation mechanisms and antimicrobial activity
Publisher: Elsevier BV
Date: 06-2019
DOI: 10.1016/J.JCIS.2019.03.051
Abstract: Zinc oxide (ZnO) particles with different shapes and sizes have been previously reported to possess unique optical, electrical, photocatalytic, and antimicrobial properties. Capping agents are routinely used to control particle morphologies however, few studies have evaluated the influence of capping agents on the growth kinetics of ZnO particles of different shapes. Herein, we report a simple water-based chemical precipitation method to produce unique bowtie-, flower-, and nest-shaped ZnO particles using zinc nitrate and urea in the presence of polyvinylpyrrolidone (PVP). Three distinct particle morphologies are obtained by adjusting polymer concentration during synthesis. This approach is simple and could enable large-scale production of ZnO particles with erse shapes. We monitor the morphological evolution of ZnO particles and, at different polymer concentrations, uncover the preferable PVP adsorption onto different ZnO facets that controls the growth directions of ZnO. Previous reports have demonstrated the influence of particle shape on ZnO antibacterial activity. In this study, we show that ZnO particles with these three morphologies exhibit similar bacterial killing efficacy towards Escherichia coli and Staphylococcus aureus. Our detailed mechanistic studies suggest that the antibacterial mechanism of ZnO particles can be attributed to both Zn
Sulfur doped Co/SiO2catalysts for chirally selective synthesis of single walled carbon nanotubes
Publisher: Royal Society of Chemistry (RSC)
Date: 21-01-2013
DOI: 10.1039/C3CC38973A
Abstract: Monochiral single-walled carbon nanotubes have many potential uses, especially in the field of electronics and medical applications. Here we demonstrate a method to activate three types of Co/SiO(2) catalysts via sulfur-doping for the synthesis of tubes with a narrow chiral distribution around (9,8) chirality.
Carbon nanotubes for flexible batteries: recent progress and future perspective
Publisher: Oxford University Press (OUP)
Date: 20-10-2021
DOI: 10.1093/NSR/NWAA261
Abstract: Flexible batteries, which maintain their functions potently under various mechanical deformations, attract increasing interest due to potential applications in emerging portable and wearable electronics. Significant efforts have been devoted to material synthesis and structural designs to realize the mechanical flexibility of various batteries. Carbon nanotubes (CNTs) have a unique one-dimensional (1D) nanostructure and are convenient to further assemble into erse macroscopic structures, such as 1D fibers, 2D films and 3D sponges/aerogels. Due to their outstanding mechanical and electrical properties, CNTs and CNT-based hybrid materials are superior building blocks for different components in flexible batteries. This review summarizes recent progress on the application of CNTs in developing flexible batteries, from closed-system to open-system batteries, with a focus on different structural designs of CNT-based material systems and their roles in various batteries. We also provide perspectives on the challenges and future research directions for realizing practical applications of CNT-based flexible batteries.
Microwave Dielectric Properties of Carbon Nanotube Composites
Publisher: InTech
Date: 03-2010
DOI: 10.5772/39420
Viscosity sensitive near-infrared fluorescent probes based on functionalized single-walled carbon nanotubes
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0CC02813D
Abstract: A new family of viscosity sensitive near-infrared fluorescent probes is created by grafting rotors on single walled carbon nanotubes. The new photoluminescence emission peaks are highly sensitive to the viscosity of solutions.
Sharper and faster Nano darts kill more bacteria: A study of antibacterial activity of individually dispersed pristine single-walled carbon nanotube
Publisher: American Chemical Society (ACS)
Date: 06-11-2009
DOI: 10.1021/NN901252R
Abstract: To further our understanding on the antibacterial activity of single-walled carbon nanotubes (SWCNTs), high purity SWCNTs with average diameter of 0.83 nm and (7,5) chirality as dominate (n,m) structure were dispersed in a biocompatible surfactant solution. Ultraviolet-visible-near-infrared radiation absorption spectroscopy was employed to monitor the aggregation of SWCNTs. The results demonstrated that in idually dispersed SWCNTs were more toxic than SWCNT aggregates toward bacteria (gram-negative Escherichia coli, Pseudomonas aeruginosa, and gram-positive Staphylococcus aureus, Bacillus subtilis). In idually dispersed SWCNTs can be visualized as numerous moving "nano darts" in the solution, constantly attacking the bacteria thereby, degrading the bacterial cell integrity and causing the cell death. Controlled experimental results suggested that inhibiting cell growth and oxidative stress were not the major causes responsible for the death of cells. Furthermore, the detrimental effects of Co metal residues (up to 1 mug/mL) on SWCNT s les can be ruled out. Atomic force microscope study conducted in suspension proved that the death rates of bacteria were strongly correlated with their mechanical properties soft cells were more vulnerable to SWCNT piercing. The antibacterial activity of SWCNTs can be remarkably improved by enhancing the SWCNT physical puncture on bacteria in the following ways: (1) dispersing SWCNTs in idually to sharpen the nano darts (2) increasing SWCNT concentration to raise the population density of nano darts and (3) elevating the shaking speed of incubation to speed up the nano darts. This study elucidated several factors controlling the antibacterial activity of pristine SWCNTs and it provided an insight in developing strategies that can maximize the SWCNT application potentials while minimizing the health and environment risks.
Toward high-performance solution-processed carbon nanotube network transistors by removing nanotube bundles
Publisher: American Chemical Society (ACS)
Date: 19-07-2008
DOI: 10.1021/JP805434D
Selective Enrichment of (6,5) and (8,3) Single-Walled Carbon Nanotubes via Cosurfactant Extraction from Narrow (n,m) Distribution Samples
Publisher: American Chemical Society (ACS)
Date: 16-02-2008
DOI: 10.1021/JP8003322
Abstract: Highly selective enrichment of (6,5) and (8,3) SWCNTs (above 85% of the semiconducting tubes) was achieved through multistep extraction by sodium dodecyl sulfate (SDS) and sodium cholate (SC) cosurfactant solution from narrowly (n,m) distributed SWCNTs produced by the catalyst Co-MCM-41. A systematic change in the chirality selectivity was observed when the weight ratio between SDS and SC varied in cosurfactant solutions, with maximum enrichment selectivity for (6,5) tubes yielded at 1:4. Furthermore, surfactants were washed away easily to produce "clean" SWCNTs. This observation sheds light on the possibility of obtaining SWCNTs with the desired (n,m) structure via an easily scalable approach. No selectivity was detected when using sodium dodecyl benzene sulfonate (SDBS)/SC cosurfactants, hence suggesting the need for further exploration of various cosurfactant combinations for more effective extraction of different (n,m) species.
Solid carbon co-products from hydrogen production by methane pyrolysis: Current understandings and recent progress
Publisher: Elsevier BV
Date: 2024
Antibacterial action of dispersed single-walled carbon nanotubes on Escherichia coli and Bacillus subtilis investigated by atomic force microscopy
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0NR00441C
Abstract: Single-walled carbon nanotubes (SWCNTs) exhibit strong antibacterial activities. Direct contact between bacterial cells and SWCNTs may likely induce cell damages. Therefore, the understanding of SWCNT-bacteria interactions is essential in order to develop novel SWCNT-based materials for their potential environmental, imaging, therapeutic, and military applications. In this preliminary study, we utilized atomic force microscopy (AFM) to monitor dynamic changes in cell morphology and mechanical properties of two typical bacterial models (gram-negative Escherichia coli and gram-positive Bacillus subtilis) upon incubation with SWCNTs. The results demonstrated that in idually dispersed SWCNTs in solution develop nanotube networks on the cell surface, and then destroy the bacterial envelopes with leakage of the intracellular contents. The cell morphology changes observed on air dried s les are accompanied by an increase in cell surface roughness and a decrease in surface spring constant. To mimic the collision between SWCNTs and cells, a sharp AFM tip of 2 nm was chosen to introduce piercings on the cell surface. No clear physical damages were observed if the applied force was below 10 nN. Further analysis also indicates that a single collision between one nanotube and a bacterial cell is unlikely to introduce direct physical damage. Hence, the antibacterial activity of SWCNTs is the accumulation effect of large amount of nanotubes through interactions between SWCNT networks and bacterial cells.
Chiral-Selective CoSO4/SiO2 Catalyst for (9,8) Single-Walled Carbon Nanotube Growth
Publisher: American Chemical Society (ACS)
Date: 12-12-2012
DOI: 10.1021/NN3047633
Abstract: Electronic and optical properties of single-walled carbon nanotubes (SWCNTs) correlate with their chiral structures. Many applications need chirally pure SWCNTs that current synthesis methods cannot produce. Here, we show a sulfate-promoted CoSO(4)/SiO(2) catalyst, which selectively grows large-diameter (9,8) nanotubes at 1.17 nm with 51.7% abundance among semiconducting tubes and 33.5% over all tube species. After reduction in H(2) at 540 °C, the catalyst containing 1 wt % Co has a carbon yield of 3.8 wt %, in which more than 90% is SWCNT. As compared to other Co catalysts used for SWCNT growth, the CoSO(4)/SiO(2) catalyst is unique with a narrow Co reduction window under H(2) centered at 470 °C, which can be attributed to the reduction of highly dispersed CoSO(4). X-ray absorption spectroscopy (XAS) results suggested the formation of Co particles with an average size of 1.23 nm, which matches the diameter of (9,8) tubes. Density functional theory study indicated that the diameter of structurally stable pure Co particles is scattered, matching the most abundant chiral tubes, such as (6,5) and (9,8). Moreover, the formation of such large Co particles on the CoSO(4)/SiO(2) catalyst depends on sulfur in the catalyst. XAS results showed that sulfur content in the catalyst changes after catalyst reduction at different conditions, which correlates with the change in (n,m) selectivity observed. We proposed that the potential roles of sulfur could be limiting the aggregation of Co atoms and/or forming Co-S compounds, which enables the chiral selectivity toward (9,8) tubes. This work demonstrates that catalysts promoted with sulfur compounds have potentials to be further developed for chiral-selective growth of SWCNTs.
Recent Advances in Carbon Nanotube Utilizations in Perovskite Solar Cells
Publisher: Wiley
Date: 26-10-2021
Mesostructured molecular solid material |Co(en)3|(Zr 2F11H2O) with enhanced photoelectronic effect
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B902998B
Abstract: A novel molecular solid material |Co(en)(3)|(Zr(2)F(11)H(2)O) containing a H-bonded assembly of [Zr(4)F(22)O(2)](10-) and [Co(en)(3)](3+) ions was synthesized. Moreover, we demonstrated the successful preparation of this molecular solid with a mesostructured framework using a triblock co-polymer P123 (PEO-PPO-PEO) as the structure directing agent under acidic conditions. A study on its photoelectronic property revealed that the mesostructured molecular solid material significantly enhanced the photoelectronic conversion compared to that of its bulk counterpart, which may be attributed to a remarkable increase of the density of accessible optically active sites in the mesostructured molecular solid material.
A core-sheath holey graphene/graphite composite fiber intercalated with MoS 2 nanosheets for high-performance fiber supercapacitors
Publisher: Elsevier BV
Date: 05-2019
Highly dispersed manganese oxide catalysts grafted on SBA-15: Synthesis, characterization and catalytic application in trans-stilbene epoxidation
Publisher: Elsevier BV
Date: 08-2010
Individually dispersing single-walled carbon nanotubes with novel neutral pH water-soluble chitosan derivatives
Publisher: American Chemical Society (ACS)
Date: 19-04-2008
DOI: 10.1021/JP711039S
Controlled Functionalization of Carbonaceous Fibers for Asymmetric Solid‐State Micro‐Supercapacitors with High Volumetric Energy Density
Publisher: Wiley
Date: 02-09-2014
Abstract: A 1.8 V asymmetric solid-state flexible micro-supercapacitor is designed with one MnO2 -coated reduced graphene oxide/single-walled carbon nanotube (rGO/SWCNT) composite fiber as positive electrode and one nitrogen-doped rGO/SWCNT fiber as negative electrode, which demonstrates ultrahigh volumetric energy density, comparable to some thin-film lithium batteries, along with high power density, long cycle life, and good flexibility.
The effect of the cobalt loading on the growth of single wall carbon nanotubes by CO disproportionation on Co-MCM-41 catalysts
Publisher: Elsevier BV
Date: 2006
Graphene layers on Cu and Ni (111) surfaces in layer controlled graphene growth
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2RA23105K
A review on lithium recovery using electrochemical capturing systems
Publisher: Elsevier BV
Date: 03-2021
Chemometric determination of the length distribution of single walled carbon nanotubes through optical spectroscopy
Publisher: Elsevier BV
Date: 12-2011
DOI: 10.1016/J.ACA.2011.09.041
Abstract: Current synthesis methods for producing single walled carbon nanotubes (SWCNTs) do not ensure uniformity of the structure and properties, in particular the length, which is an important quality indicator of SWCNTs. As a result, sorting SWCNTs by length is an important post-synthesis processing step. For this purpose, convenient analysis methods are needed to characterize the length distribution rapidly and accurately. In this study, density gradient ultracentrifugation was applied to prepare length-sorted SWCNT suspensions containing in idualized surfactant-wrapped SWCNTs. The length of sorted SWCNTs was first determined by atomic force microscope (AFM), and their absorbance was measured in ultraviolet-visible near-infrared (UV-vis-NIR) spectroscopy. Chemometric methods are used to calibrate the spectra against the AFM-measured length distribution. The calibration model enables convenient analysis of the length distribution of SWCNTs through UV-vis-NIR spectroscopy. Various chemometric techniques are investigated, including pre-processing methods and non-linear calibration models. Extended inverted signal correction, extended multiplicative signal correction and Gaussian process regression are found to provide good prediction of the length distribution of SWCNTs with satisfactory agreement with the AFM measurements. In summary, spectroscopy in conjunction with advanced chemometric techniques is a powerful analytical tool for carbon nanotube research.
Perylene bisimide-incorporated water-soluble polyurethanes for living cell fluorescence labeling
Publisher: Elsevier BV
Date: 2016
Flexible Zinc-Ion Hybrid Fiber Capacitors with Ultrahigh Energy Density and Long Cycling Life for Wearable Electronics
Publisher: Wiley
Date: 14-10-2019
Abstract: Emerging wearable electronics require flexible energy storage devices with high volumetric energy and power densities. Fiber-shaped capacitors (FCs) offer high power densities and excellent flexibility but low energy densities. Zn-ion capacitors have high energy density and other advantages, such as low cost, nontoxicity, reversible Faradaic reaction, and broad operating voltage windows. However, Zn-ion capacitors have not been applied in wearable electronics due to the use of liquid electrolytes. Here, the first quasisolid-state Zn-ion hybrid FC (ZnFC) based on three rationally designed components is demonstrated. First, hydrothermally assembled high surface area and conductive reduced graphene oxide/carbon nanotube composite fibers serve as capacitor-type positive electrodes. Second, graphite fibers coated with a uniform Zn layer work as battery-type negative electrodes. Third, a new neutral ZnSO
All-carbon solid-state yarn supercapacitors from activated carbon and carbon fibers for smart textiles
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5MH00108K
Abstract: A wearable wristband from knittable two-ply yarn supercapacitors with high specific length capacitance.
Capacitive deionization of carbon spheres with a carbon shell derived from the quantum dots of urea-citric acid grown in situ
Publisher: Elsevier BV
Date: 06-2021
Stable Zn electrodes enabled by an ultra-thin Zn phosphate protective layer
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2TA09153D
Abstract: An ultra-thin (45 ± 5 nm) ion conductive surface protection layer prepared by a simple chemical treatment method effectively enhances the surface stability of Zn electrodes and prolongs their cycling stability.
Ultralow-platinum-loading nanocarbon hybrids for highly sensitive hydrogen peroxide detection
Publisher: Elsevier BV
Date: 03-2019
Photoconductivity from carbon nanotube transistors activated by photosensitive polymers
Publisher: American Chemical Society (ACS)
Date: 29-10-2008
DOI: 10.1021/JP805315X
Recent Advances in Materials and Design of Electrochemically Rechargeable Zinc–Air Batteries
Publisher: Wiley
Date: 29-08-2018
Abstract: The century-old zinc-air (Zn-air) battery concept has been revived in the last decade due to its high theoretical energy density, environmental-friendliness, affordability, and safety. Particularly, electrically rechargeable Zn-air battery technologies are of great importance for bulk applications like electric vehicles, grid management, and portable electronic devices. Nevertheless, Zn-air batteries are still not competitive enough to realize widespread practical adoption because of issues in efficiency, durability, and cycle life. Here, following an introduction to the fundamentals and performance testing techniques, the latest research progress related to electrically rechargeable Zn-air batteries is compiled, particularly new key findings in the last five years (2013-2018). The strategies concerning the development of Zn and air electrodes are in focus. The design of other battery components, namely electrolytes and separators are also discussed. Poor performance of O
Graphene Materials in Antimicrobial Nanomedicine: Current Status and Future Perspectives
Publisher: Wiley
Date: 05-03-2018
Abstract: Graphene materials (GMs), such as graphene, graphene oxide (GO), reduced GO (rGO), and graphene quantum dots (GQDs), are rapidly emerging as a new class of broad-spectrum antimicrobial agents. This report describes their state-of-the-art and potential future covering both fundamental aspects and biomedical applications. First, the current understanding of the antimicrobial mechanisms of GMs is illustrated, and the complex picture of underlying structure-property-activity relationships is sketched. Next, the different modes of utilization of antimicrobial GMs are explained, which include their use as colloidal dispersions, surface coatings, and photothermal hotodynamic therapy agents. Due to their practical relevance, the ex les where GMs function as synergistic agents or release platforms for metal ions and/or antibiotic drugs are also discussed. Later, the applicability of GMs in the design of wound dressings, infection-protective coatings, and antibiotic-like formulations ("nanoantibiotics") is assessed. Notably, to support our assessments, the existing clinical applications of conventional carbon materials are also evaluated. Finally, the key hurdles of the field are highlighted, and several possible directions for future investigations are proposed. We hope that the roadmap provided here will encourage researchers to tackle remaining challenges toward clinical translation of promising research findings and help realize the potential of GMs in antimicrobial nanomedicine.
Energy Transfer from Photo-Excited Fluorene Polymers to Single-Walled Carbon Nanotubes
Publisher: American Chemical Society (ACS)
Date: 07-2009
DOI: 10.1021/JP904431U
High‐Performance Partially Printed Hybrid CMOS Inverters Based on Indium‐Zinc‐Oxide and Chirality Enriched Carbon Nanotube Thin‐Film Transistors
Publisher: Wiley
Date: 04-2019
Multifunctional hierarchical graphene-carbon fiber hybrid aerogels for strain sensing and energy storage
Publisher: Springer Science and Business Media LLC
Date: 20-12-2023
Fabrication of Two-Dimensional Material Membranes
Publisher: Johnson Matthey
Date: 2023
Selective synthesis of single walled carbon nanotubes on metal (iron, nickel or cobalt) sulfate-based catalysts
Publisher: Elsevier BV
Date: 04-2018
One-dimensional covalent organic framework—Carbon nanotube heterostructures for efficient capacitive energy storage
Publisher: AIP Publishing
Date: 22-11-2021
DOI: 10.1063/5.0073426
Abstract: Covalent organic frameworks (COFs) with redox-active moieties are potential capacitive energy storage materials. However, their performance is limited by their poor electrical conductivity and sluggish ion diffusion in their nanopores. Herein, we report coaxial one-dimensional van der Waals heterostructures (vdWHs) comprised of a carbon nanotube (CNT) core and a pyrene–pyridine COF shell synthesized by an in situ wrapping method. The coaxial structure allows efficient electronic interaction between the CNT core and COF shell and improves the electrical conductivity significantly. It also improves electrolyte ion accesses to redox-active pyridine groups in the COF, resulting in excellent capacitive energy storage performance with a high specific capacitance of ∼360 F g−1, an excellent rate capability of ∼80%, and a good stability of 92% capacitance retention after 20 000 charge/discharge cycles. Our strategy opens the door to create other multi-dimensional vdWHs for various potential applications.
Graphitic Co‐Products of Clean Hydrogen Production Enabling High‐Rate‐Performance Dual‐Carbon Batteries
Publisher: Wiley
Date: 23-04-2023
Abstract: Methane pyrolysis (CH 4 → 2H 2 + C) is a promising H 2 production process with zero CO 2 emissions. Utilizing its solid carbon co‐products can make it economically more competitive. Herein, this work demonstrates that graphitic carbon from methane pyrolysis can work as both cathodes and anodes to enable high‐rate‐performance dual‐carbon batteries (DCBs), outperforming commercial natural and synthetic graphite. The graphite purity can reach 99.32 and 97.59 wt%, respectively, using a standard high‐temperature thermal treatment or a room‐temperature electrochemical method. Compared to graphite, they have smaller crystalline sizes and larger surface areas, enabling faster surface redox reactions and better structural stability upon electrolyte ion intercalation. DCB full cells with LiPF 6 ethyl methyl carbonate electrolyte deliver energy storage capacities of 75.1 and 74.7 mAh g −1 at 500 mA g −1 with capacity retentions of 79.2% and 93.4% after the high‐rate charge–discharge over 5000 mA g −1 , respectively. They can also be cycled at 500 mA g −1 over 300 cycles without capacity decay, demonstrating excellent cycling stability. They show energy densities of 168.7 and 159.7 Wh kg −1 at power densities of 10.6 and 10.8 kW kg −1 , outperforming recently reported DCBs. These findings open a new application of graphite co‐product from the emission‐free H 2 production process.
Aggregation-dependent photoluminescence sidebands in single-walled carbon nanotube
Publisher: American Chemical Society (ACS)
Date: 24-03-2010
DOI: 10.1021/JP910916A
Interfacial engineering of heterogeneous molecular electrocatalysts using ionic liquids towards efficient hydrogen peroxide production
Publisher: Elsevier BV
Date: 05-2022
Bolometric-Effect-Based Wavelength-Selective Photodetectors Using Sorted Single Chirality Carbon Nanotubes
Publisher: Springer Science and Business Media LLC
Date: 08-12-2015
DOI: 10.1038/SREP17883
Abstract: This paper exploits the chirality-dependent optical properties of single-wall carbon nanotubes for applications in wavelength-selective photodetectors. We demonstrate that thin-film transistors made with networks of carbon nanotubes work effectively as light sensors under laser illumination. Such photoresponse was attributed to photothermal effect instead of photogenerated carriers and the conclusion is further supported by temperature measurements. Additionally, by using different types of carbon nanotubes, including a single chirality (9,8) nanotube, the devices exhibit wavelength-selective response, which coincides well with the absorption spectra of the corresponding carbon nanotubes. This is one of the first reports of controllable and wavelength-selective bolometric photoresponse in macroscale assemblies of chirality-sorted carbon nanotubes. The results presented here provide a viable route for achieving bolometric-effect-based photodetectors with programmable response spanning from visible to near-infrared by using carbon nanotubes with pre-selected chiralities.
Toward efficient and high rate sodium-ion storage: A new insight from dopant-defect interplay in textured carbon anode materials
Publisher: Elsevier BV
Date: 06-2020
Exploring the upper limit of single-walled carbon nanotube purity by multiple-cycle aqueous two-phase separation
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7NR03302H
Abstract: Comparison of characterization methods for evaluating ultra high purity semiconducting single-walled carbon nanotubes.
2D materials for 1D electrochemical energy storage devices
Publisher: Elsevier BV
Date: 05-2019
Covalent Organic Frameworks for Capacitive Energy Storage: Recent Progress and Technological Challenges
Publisher: Wiley
Date: 02-02-2023
Abstract: Covalent‐organic frameworks (COFs) are emerging organic crystalline materials with a porous framework that extends into two or three dimensions. Originating from their versatile and rigorous synthesis conditions, COFs have abundant and tunable pores, large and easily accessible surfaces, and plenty of redox‐active sites, making them promising material candidates for various energy storage applications. One important area is to serve as capacitive electrode materials in supercapacitors. This review provides a timely and comprehensive summary of the recent progress in the design and synthesis of COF‐based or COF‐derived materials for capacitive energy storage applications. The review starts with a brief introduction to COFs’ structural features and synthesis methods. Next, recently reported literature is categorized and introduced following their different energy storage mechanisms and material assembly or treatment approaches. Finally, the existing challenges and future directions for realizing practical COF‐based supercapacitors are discussed.
Cardanol-derived cationic surfactants enabling the superior antibacterial activity of single-walled carbon nanotubes
Publisher: IOP Publishing
Date: 09-04-2020
Nitrogen doped holey graphene as an efficient metal-free multifunctional electrochemical catalyst for hydrazine oxidation and oxygen reduction
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3NR34267K
Abstract: Electrocatalysts for anode or cathode reactions are at the heart of electrochemical energy conversion and storage devices. Molecular design of carbon based nanomaterials may create the next generation electrochemical catalysts for broad applications. Herein, we present the synthesis of a three-dimensional (3D) nanostructure with a large surface area (784 m(2) g(-1)) composed of nitrogen doped (up to 8.6 at.%) holey graphene. The holey structure of graphene sheets (~25% of surface area is attributed to pores) engenders more exposed catalytic active edge sites. Nitrogen doping further improves catalytic activity, while the formation of the 3D porous nanostructure significantly reduces graphene nanosheet stacking and facilitates the diffusion of reactants/electrolytes. The three factors work together, leading to superb electrochemical catalytic activities for both hydrazine oxidation (its current generation ability is comparable to that of 10 wt% Pt-C catalyst) and oxygen reduction (its limiting current is comparable to that of 20 wt% Pt-C catalyst) with four-electron transfer processes and excellent durability.
Cellular response of RAW 264.7 to spray-coated multi-walled carbon nanotube films with various surfactants
Publisher: Wiley
Date: 08-12-2011
DOI: 10.1002/JBM.A.32998
Abstract: The increasing role of carbon nanotubes (CNTs) in various biological applications has led to a number of studies on the cytotoxicity of solution-phase CNTs, but few studies are available concerning the cytotoxicity of CNT films. Herein, we studied the potential health effect of CNT films fabricated with three commercial surfactants (sodium cholate, sodium dodecyl sulfate, and triton X-100). Multi-walled carbon nanotube-surfactant dispersions were coated onto substrates through air-spray technique. Cellular morphology, MTT assays, as well as the expression of TNF-α and IL-1β of RAW 264.7 cells cultured on the spray-coated CNT films were evaluated for cytotoxicity. It was found that the cytotoxicity of the CNT films was largely dependent on the type of surfactant used and could be significantly reduced by mild washing steps.
Homogeneous, Heterogeneous, and Biological Catalysts for Electrochemical N2 Reduction toward NH3 under Ambient Conditions
Publisher: American Chemical Society (ACS)
Date: 29-04-2019
Influence of graphene oxide lateral size on the properties and performances of forward osmosis membrane
Publisher: Elsevier BV
Date: 06-2020
Controlling water transport in carbon nanotubes
Publisher: Elsevier BV
Date: 06-2017
Extraction of (9,8) single-walled carbon nanotubes by fluorene-based polymers
Publisher: Wiley
Date: 20-12-2014
Abstract: Selective polymer wrapping is a promising approach to obtain high-chiral-purity single-walled carbon nanotubes (SWCNTs) needed in technical applications and scientific studies. We showed that among three fluorene-based polymers with different side-chain lengths and backbones, poly[(9,9-dihexylfluorenyl-2,7-diyl)-co-(9,10-anthracene)] (PFH-A) can selectively extract SWCNTs synthesized from the CoSO4 /SiO2 catalyst, which results in enrichment of 78.3 % (9,8) and 12.2 % (9,7) nanotubes among all semiconducting species. These high-chiral-purity SWCNTs may find potential applications in electronics, optoelectronics, and photovoltaics. Furthermore, molecular dynamics simulations suggest that the extraction selectivity of PFH-A relates to the bending and alignment of its alkyl chains and the twisting of its two aromatic backbone units (biphenyl and anthracene) relative to SWCNTs. The strong π-π interaction between polymers and SWCNTs would increase the extraction yield, but it is not beneficial for chiral selectivity. Our findings suggest that the matching between the curvature of SWCNTs and the flexibility of the polymer side chains and the aromatic backbone units is essential in designing novel polymers for selective extraction of (n,m) species.
Vanishing Hysteresis in Carbon Nanotube Transistors Embedded in Boron Nitride/Polytetrafluoroethylene Heterolayers
Publisher: Wiley
Date: 16-06-2020
Emergence of fiber supercapacitors
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4CS00286E
Abstract: Fiber supercapacitors utilizing one-dimensional cylindrically shaped fibers as electrodes have shown great application potential in wearable electronics and smart textiles.
Deposition of silver nanoparticles on multiwalled carbon nanotubes grafted with hyperbranched poly(amidoamine) and their antimicrobial effects
Publisher: American Chemical Society (ACS)
Date: 08-11-2008
DOI: 10.1021/JP807133J
Impact of Conjugated Polymer Characteristics on the Enrichment of Single-Chirality Single-Walled Carbon Nanotubes
Publisher: American Chemical Society (ACS)
Date: 02-08-2022
The roles of metal-organic frameworks in modulating water permeability of graphene oxide-based carbon membranes
Publisher: Elsevier BV
Date: 07-2019
A graphene-covalent organic framework hybrid for high-performance supercapacitors
Publisher: Elsevier BV
Date: 11-2020
The Mechanism of Single-Walled Carbon Nanotube Growth and Chirality Selection Induced by Carbon Atom and Dimer Addition
Publisher: American Chemical Society (ACS)
Date: 27-01-2010
DOI: 10.1021/NN901761U
Abstract: On the basis of abounding density function calculations, a mechanism is proposed to explain single-walled carbon nanotube (SWCNT) growth and chirality selection induced by single C atom and C(2) dimer addition under catalyst-free conditions. Two competitive reaction paths, chirality change induced by single C atom and nanotube growth through C(2) dimer addition, are identified. The structures of the intermediates and transition states along the potential energy surfaces during the formation of near-armchair (6,5), (7,5), (8,5), and (9,5) caps initiated from the armchair carbon cap (5,5) are elucidated in detail. The results show that the direct adsorptions of C atom or C(2) dimer on growing carbon caps have no energy barrier. Moreover, the incorporations of adsorbed C atom or C(2) dimer display low energy barriers, indicating SWCNT growth and chirality change are thermodynamically and kinetically feasible under catalyst-free growth conditions. In addition, the results also highlight that the concentrations of C atoms and C(2) dimers in the experimental environment would play a critical role in the chiral-selective SWCNT synthesis. Potential opportunities exist in achieving the (n,m) selective growth by delivering single C atom or C(2) dimers at different ratios during different reaction stages.
Heterogeneous molecular Co–N–C catalysts for efficient electrochemical H2O2 synthesis
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2EE02734H
Abstract: Heterogeneous molecular catalysts built from β-substituted cobalt porphyrins and carbon nanotubes afford tunable activity for H 2 O 2 synthesis via the two-electron transfer oxygen reduction reaction.
A narrow-bandgap benzobisthiadiazole derivative with high near-infrared photothermal conversion efficiency and robust photostability for cancer therapy
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4CC09399B
Abstract: A novel photothermal therapeutic agent based on a narrow-bandgap benzobisthiadiazole derivative shows strong absorption in the near-infrared region, high photothermal efficiency and robust photostability for treatment of cancer cells.
Enantioselectively controlled release of chiral drug (metoprolol) using chiral mesoporous silica materials
Publisher: IOP Publishing
Date: 30-03-2010
DOI: 10.1088/0957-4484/21/16/165103
Abstract: Chiral porous materials have attracted burgeoning attention on account of their potential applications in many areas, such as enantioseparation, chiral catalysis, chemical sensors and drug delivery. In this report, chiral mesoporous silica (CMS) materials with various pore sizes and structures were prepared using conventional achiral templates (other than chiral surfactant) and a chiral cobalt complex as co-template. The synthesized CMS materials were characterized by x-ray diffraction, nitrogen physisorption, scanning electron microscope and transmission electron microscope. These CMS materials, as carriers, were demonstrated to be able to control the enantioselective release of a representative chiral drug (metoprolol). The release kinetics, as modeled by the power law equation, suggested that the release profiles of metoprolol were remarkably dependent on the pore diameter and pore structure of CMS materials. More importantly, R- and S-enantiomers of metoprolol exhibited different release kinetics on CMS compared to the corresponding achiral mesoporous silica (ACMS), attributable to the existence of local chirality on the pore wall surface of CMS materials. The chirality of CMS materials on a molecular level was further substantiated by vibrational circular dichroism measurements.
Direct synthesis of highly ordered Co-SBA-15 mesoporous materials by the pH-adjusting approach
Publisher: Elsevier BV
Date: 04-2008
Multifunctional nitrogen-rich “brick-and-mortar” carbon as high performance supercapacitor electrodes and oxygen reduction electrocatalysts
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA12581E
Transforming Pristine Carbon Fiber Tows into High Performance Solid‐State Fiber Supercapacitors
Publisher: Wiley
Date: 14-07-2015
Abstract: A facile activation strategy can transform pristine carbon fiber tows into high-performance fiber electrodes with a specific capacitance of 14.2 F cm(-3) . The knottable fiber supercapacitor shows an energy density of 0.35 mW h cm(-3) , an ultrahigh power density of 3000 mW cm(-3) , and a remarkable capacitance retention of 68%, when the scan rate increases from 10 to 1000 mV s(-1) .
Epitaxial growth of CdS nanoparticle on Bi2S3 nanowire and photocatalytic application of the heterostructure
Publisher: American Chemical Society (ACS)
Date: 06-07-2011
DOI: 10.1021/JP112259P
Electronic Modulation of Nickel Disulfide toward Efficient Water Electrolysis
Publisher: Wiley
Date: 04-2020
MXenes for Zinc‐Based Electrochemical Energy Storage Devices
Publisher: Wiley
Date: 08-2023
Abstract: As an economical and safer alternative to lithium, zinc (Zn) is promising for realizing new high‐performance electrochemical energy storage devices, such as Zn‐ion batteries, Zn‐ion hybrid capacitors, and Zn‐air batteries. Well‐designed electrodes are needed to enable efficient Zn electrochemistry for energy storage. Two‐dimensional transition metal carbides and nitrides (MXenes) are emerging materials with unique electrical, mechanical, and electrochemical properties and versatile surface chemistry. They are potential material candidates for constructing high‐performance electrodes of Zn‐based energy storage devices. This review first briefly introduces the working mechanisms of the three Zn‐based energy storage devices. Then, the recent progress on the synthesis, chemical functionalization, and structural design of MXene‐based electrodes is summarized. Their performance in Zn‐based devices is analyzed to establish relations between material properties, electrode structures, and device performance. Last, several research topics are proposed to be addressed for developing practical MXene‐based electrodes for Zn‐based energy storage devices to enable their commercialization and broad adoption in the near future.
Biofilm-Templated Heteroatom-Doped Carbon–Palladium Nanocomposite Catalyst for Hexavalent Chromium Reduction
Publisher: American Chemical Society (ACS)
Date: 18-06-2019
Abstract: In this study, we report an interdisciplinary and novel strategy toward biofilm engineering for the development of a biofilm-templated heteroatom-doped catalytic system through bioreduction and biofilm matrix-facilitated immobilization of the in situ-formed catalytic nanoparticles followed by controlled pyrolysis. We showed that (i) even under room temperature and bulk aerobic conditions,
Nanotube-supported bioproduction of 4-hydroxy-2-butanone via in situ cofactor regeneration
Publisher: Springer Science and Business Media LLC
Date: 25-11-2012
DOI: 10.1007/S00253-011-3699-Z
Abstract: Nicotinamide cofactor-dependent oxidoreductases have been widely employed during the bioproduction of varieties of useful compounds. Efficient cofactor regeneration is often required for these biotransformation reactions. Herein, we report the synthesis of an important pharmaceutical intermediate 4-hydroxy-2-butanone (4H2B) via an immobilized in situ cofactor regeneration system composed of NAD(+)-dependent glycerol dehydrogenase (GlyDH) and NAD(+)-regenerating NADH oxidase (nox). Both enzymes were immobilized on functionalized single-walled carbon nanotubes (SWCNTs) through the specific interaction between the His-tagged enzymes and the modified SWCNTs. GlyDH demonstrated ca. 100% native enzyme activity after immobilization. The GlyDH/nox ratio, pH, and amount of nicotinamide cofactor were examined to establish the optimum reaction conditions for 4H2B production. The nanoparticle-supported cofactor regeneration system become more stable and the yield of 4H2B turned out to be almost twice (37%) that of the free enzyme system after a 12-h reaction. Thus, we believe that this non-covalent specific immobilization procedure can be applied to cofactor regeneration system for bioconversions.
Low-Temperature Electroluminescence Excitation Mapping of Excitons and Trions in Short-Channel Monochiral Carbon Nanotube Devices.
Publisher: American Chemical Society (ACS)
Date: 10-01-2020
Abstract: Single-walled carbon nanotubes as emerging quantum-light sources may fill a technological gap in silicon photonics due to their potential use as near-infrared, electrically driven, classical or nonclassical emitters. Unlike in photoluminescence, where nanotubes are excited with light, electrical excitation of single tubes is challenging and heavily influenced by device fabrication, architecture, and biasing conditions. Here we present electroluminescence spectroscopy data of ultra-short-channel devices made from (9,8) carbon nanotubes emitting in the telecom band. Emissions are stable under current biasing, and no enhanced suppression is observed down to 10 nm gap size. Low-temperature electroluminescence spectroscopy data also reported exhibit cold emission and line widths down to 2 meV at 4 K. Electroluminescence excitation maps give evidence that carrier recombination is the mechanism for light generation in short channels. Excitonic and trionic emissions can be switched on and off by gate voltage, and corresponding emission efficiency maps were compiled. Insights are gained into the influence of acoustic phonons on the line width, absence of intensity saturation and exciton-exciton annihilation, environmental effects such as dielectric screening and strain on the emission wavelength, and conditions to suppress hysteresis and establish optimum operation conditions.
MXene Materials for Designing Advanced Separation Membranes
Publisher: Wiley
Date: 02-06-2020
Graphitic carbon from catalytic methane decomposition as efficient conductive additives for zinc-carbon batteries
Publisher: Elsevier BV
Date: 06-2022
Synthesis of uniform diameter single-wall carbon nanotubes in Co-MCM-41: Effects of the catalyst prereduction and nanotube growth temperatures
Publisher: Elsevier BV
Date: 07-2004
Enrichment of (8,4) Single‐Walled Carbon Nanotubes Through Coextraction with Heparin
Publisher: Wiley
Date: 28-12-2009
Abstract: Heparin sodium salt is investigated as a dispersant for dispersing single-walled carbon nanotubes (SWNTs). Photoluminescence excitation (PLE) spectroscopy is used for identification and abundance estimation of the chiral species. It is found that heparin sodium salt preferentially disperses larger-diameter Hipco SWNTs. When used to disperse CoMoCAT nanotube s les, heparin has a strong preference for (8,4) tubes, which have larger diameter than the predominant (6,5) in pristine CoMoCAT s les. PLE intensity due to (8,4) tubes increases from 7% to 60% of the total after threefold extractions. Computer modeling verifies that the complex of (8,4) SWNTs and heparin has the lowest binding energy amongst the four semiconducting species present in CoMoCAT. Network field-effect transistors are successfully made with CoMoCAT/heparin and CoMoCAT/sodium dodecylbenzene sulfonate (SDBS)-heparin (x3), confirming the easy removability of heparin.
Octahedral Coordinated Trivalent Cobalt Enriched Multimetal Oxygen‐Evolution Catalysts
Publisher: Wiley
Date: 02-10-2020
Structural transformation of highly active metal–organic framework electrocatalysts during the oxygen evolution reaction
Publisher: Springer Science and Business Media LLC
Date: 26-10-2020
Intrinsic Activity of Metal Centers in Metal–Nitrogen–Carbon Single-Atom Catalysts for Hydrogen Peroxide Synthesis
Publisher: American Chemical Society (ACS)
Date: 17-12-2020
DOI: 10.1021/JACS.0C10636
Pressure-retarded membrane distillation for simultaneous hypersaline brine desalination and low-grade heat harvesting
Publisher: Elsevier BV
Date: 03-2020
Electrocatalytic hydrogen evolution under neutral pH conditions: current understandings, recent advances, and future prospects
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0EE01856B
Abstract: This review summarizes the latest advances in hydrogen evolution reaction under neutral conditions to enlighten future researches.
The tripartite role of 2D covalent organic frameworks in graphene-based organic solvent nanofiltration membranes
Publisher: Elsevier BV
Date: 09-2021
Sulfur-induced chirality changes in single-walled carbon nanotube synthesis by ethanol chemical vapor deposition on a Co/SiO2catalyst
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4TA05917D
Abstract: Sulfur-containing compounds can be used as additives to significantly change the chiral selectivity and carbon yield in single-walled carbon nanotube synthesis.
Charge Transfer between Metal Clusters and Growing Carbon Structures in Chirality-Controlled Single-Walled Carbon Nanotube Growth
Publisher: American Chemical Society (ACS)
Date: 12-04-2011
DOI: 10.1021/JZ200417B
“Smart poisoning” of Co/SiO2catalysts by sulfidation for chirality-selective synthesis of (9,8) single-walled carbon nanotubes
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6NR05938D
Abstract: The chirality-selective synthesis of relatively large (diameter > 1 nm) single-walled carbon nanotubes (SWCNTs) is of great interest for a variety of practical applications, but only a few catalysts are available so far. Previous studies suggested that S (compounds) can enhance the chirality-selectivity of Co catalysts in SWCNT synthesis, however, the mechanism behind is not fully understood, and no tailorable methodology has yet been developed. Here, we demonstrate a facile approach to achieve the chirality-selective synthesis of SWCNTs by the sulfidation-based poisoning of silica-supported Co catalysts using a mixture of H
Statistical design of C10-Co-MCM-41 catalytic template for synthesizing smaller-diameter single-wall carbon nanotubes
Publisher: Elsevier BV
Date: 11-2005
Using oxidation to increase the electrical conductivity of carbon nanotube electrodes
Publisher: Elsevier BV
Date: 06-2009
Chirality selective synthesis and enrichment of single walled carbon nanotubes for macroelectronics
Publisher: IEEE
Date: 10-2011
How carboxylic groups improve the performance of single-walled carbon nanotube electrochemical capacitors?
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1EE01479J
Specific and reversible immobilization of NADH oxidase on functionalized carbon nanotubes
Publisher: Elsevier BV
Date: 10-2010
DOI: 10.1016/J.JBIOTEC.2010.07.005
Abstract: Nanotechnology-inspired biocatalyst systems have attracted a lot of attention in enzyme immobilization recently. Theoretically, nanomaterials are ideal supporting materials because they can provide the upper limits on enzyme-efficiency-determining factors such as surface area/volume ratio, enzyme loading capacity and mass transfer resistance. However, common immobilization methods have limited the applicability of these biocatalysts owing to enzyme leaching, 3D structure loss, and strong diffusion resistance. Expensive enzyme purification step is also required for these methods before immobilization. In this work, we show an efficient immobilization method based on specific interaction between His-tagged NADH oxidase and functionalized single-walled carbon nanotubes without requiring enzyme purification for immobilization. We cloned the annotated NADH oxidase gene from Bacillus cereus genome and overexpressed with pET30 vector encoding N-terminal 6× His-tag. The His-tagged NADH oxidase was then immobilized onto single-walled carbon nanotubes functionalized with N(α),N(α)-bis(carboxymethyl)-L-lysine hydrate. The resulting nanoscale biocatalyst has overcome the foresaid limitations, and demonstrates good loading capacity and stability while maintaining 92% maximum activity of the native enzyme. We further demonstrate that the immobilization is reversible and can retain ca. 92% activity for a couple of loading cycles.
Ultrafast hydrothermal assembly of nanocarbon microfibers in near-critical water for 3D microsupercapacitors
Publisher: Elsevier BV
Date: 06-2018
Non-covalent synthesis of thermo-responsive graphene oxide–perylene bisimides-containing poly(N-isopropylacrylamide) hybrid for organic pigment removal
Publisher: Elsevier BV
Date: 09-2014
DOI: 10.1016/J.JCIS.2014.05.031
Abstract: In this work, thermo-responsive graphene oxide-perylene bisimides-containing poly(N-isopropylacrylamide) hybrid (TGO) was successfully prepared via non-covalent π-π stacking interactions of GO and perylene bisimides-containing poly(N-isopropylacrylamide) (PBI-PNIPAM). PBI-PNIPAM was synthesized by atom transfer radical polymerization of N-isopropylacrylamide, using bifunctional N,N'-bis[6-(2-chloropropionamide)hexyl] perylene-3,4,9,10-tetracarboxylic acid bisimide (PBI-Cl) as the initiator. The obtained polymer was then characterized by (1)H NMR and fluorescence spectroscopy. The surface chemical states, morphology, and composition of TGO were characterized by X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), respectively. This new hybrid showed reversible temperature-dependent self-assembly and disassembly at 35.9°C in water. Therefore, it may have great potentials as a convenient adsorbent for removing organic pigment, as exemplified as for removing methylene blue from water with excellent adsorption capacity of 568 mg/g, high removal efficiency of 99.5%, and facile temperature-controlled post-separation of the adsorbent.
Nickel hydroxide-carbon nanotube nanocomposites as supercapacitor electrodes: crystallinity dependent performances
Publisher: IOP Publishing
Date: 17-07-2015
DOI: 10.1088/0957-4484/26/31/314003
Abstract: Nickel hydroxide (Ni(OH)2) is a promising pseudocapacitive material to increase the energy storage capacity of supercapacitors. Ni(OH)2 has three common crystalline structures: amorphous (amor-), α-, and β-Ni(OH)2. There is a lack of good understanding on their pros and cons as supercapacitor electrodes. In this work, we synthesized three nanocomposites with thin layers (10-15 nm) of amor-, α-, and β-Ni(OH)2 deposited on conductive multi-walled carbon nanotubes (MWCNTs). The mass loading of Ni(OH)2 is analogous in these nanocomposites, ranging from 49.1-52.2 wt% with a comparable narrow-pore size distribution centered around 4-5 nm. They were fabricated into supercapacitor electrodes at a mass loading of 6 mg cm(-2) with a thickness of ∼250 μm, similar to the electrodes used in commercial supercapacitors. Our results show that MWCNT/amor-Ni(OH)2 has the highest specific capacitance (1495 or 2984 F g(-1), based on the mass of total active materials or Ni(OH)2 only at the scan rate of 5 mV s(-1) in 1 M KOH electrolyte). It also has the best rate capability among the three nanocomposites. Better performances can be attributed to its disordered structure, which increases its effective surface area and reduces diffusion resistance for redox reactions. However, superior performances gradually deteriorate to the same level as that of MWCNT/β-Ni(OH)2 over 3000 charge/discharge cycles, because amor- and α-Ni(OH)2 transform slowly to more ordered β-Ni(OH)2. Our results highlight that the electrochemical performances of MWCNT/Ni(OH)2 nanocomposites depend on the crystallinity of Ni(OH)2, and the performances of electrodes change upon the crystalline structure transformation of Ni(OH)2 under repeated redox reactions. Future research should focus on improving the structure stability of amor-Ni(OH)2.
Carbons for wearable devices - Commentary and introduction to the virtual special issue
Publisher: Elsevier BV
Date: 2018
Electrolyte additives toward practical aqueous zinc-ion batteries: recent advances and future challenges
Publisher: Elsevier BV
Date: 12-2023
Hollow fiber membrane decorated with Ag/MWNTs: Toward effective water disinfection and biofouling control
Publisher: American Chemical Society (ACS)
Date: 21-11-2011
DOI: 10.1021/NN2038725
Abstract: The currently applied disinfection methods during water treatment provide effective solutions to kill pathogens, but also generate harmful byproducts, which are required to be treated with additional efforts. In this work, an alternative and safer water disinfection system consisting of silver nanoparticle/multiwalled carbon nanotubes (Ag/MWNTs) coated on a polyacrylonitrile (PAN) hollow fiber membrane, Ag/MWNTs/PAN, has been developed. Silver nanoparticles of controlled sizes were coated on polyethylene glycol-grafted MWNTs. Ag/MWNTs were then covalently coated on the external surface of a chemically modified PAN hollow fiber membrane to act as a disinfection barrier. A continuous filtration test using E. coli containing feedwater was conducted for the pristine PAN and Ag/MWNTs/PAN composite membranes. The Ag/MWNT coating significantly enhanced the antimicrobial activities and antifouling properties of the membrane against E. coli. Under the continuous filtration mode using E. coli feedwater, the relative flux drop over Ag/MWNTs/PAN was 6%, which was significantly lower than that over the pristine PAN (55%) at 20 h of filtration. The presence of the Ag/MWNT disinfection layer effectively inhibited the growth of bacteria in the filtration module and prevented the formation of biofilm on the surface of the membrane. Such distinctive antimicrobial properties of the composite membrane is attributed to the proper dispersion of silver nanoparticles on the external surface of the membrane, leading to direct contact with bacterium cells.
Carbon/iron by-product from catalytic methane decomposition as recyclable Fenton catalyst for pollutant degradation
Publisher: Elsevier BV
Date: 09-2022
DOI: 10.1016/J.JHAZMAT.2022.129328
Abstract: Direct catalytic decomposition of methane (CDM) has been studied as a possible emission-free hydrogen production route for over 100 years. However, the high cost of catalyst regeneration limits its practical applications. Here, we demonstrate that the solid by-product from CDM using Fe ore catalysts comprising carbon nano onions encapsulated with magnetic Fe cores (Fe@C) can serve as efficient and recyclable Fenton catalysts for pollutant degradation. Fe@C/H
Ternary Hybrids of Amorphous Nickel Hydroxide–Carbon Nanotube‐Conducting Polymer for Supercapacitors with High Energy Density, Excellent Rate Capability, and Long Cycle Life
Publisher: Wiley
Date: 12-01-2015
Metal-free bifunctional carbon electrocatalysts derived from zeolitic imidazolate frameworks for efficient water splitting
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7QM00452D
Abstract: Cathodic polarization treatment modulates the surface functional group composition of ZIF-8 derived metal-free carbon catalysts, resulting in enhanced OER/HER activity.
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.
A high-performance metal-free hydrogen-evolution reaction electrocatalyst from bacterium derived carbon
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA00966A
Abstract: Nitrogen and phosphorus dual-doped mesoporous carbon derived from bacteria as a high performance electrocatalyst for the hydrogen evolution reaction.
Species-dependent energy transfer of surfactant-dispersed semiconducting single-walled carbon nanotubes
Publisher: American Chemical Society (ACS)
Date: 19-10-2009
DOI: 10.1021/JP9076883
N-doped carbon nanosheets assembled microspheres for more effective capacitive deionization
Publisher: Elsevier BV
Date: 12-2021
Controlling of physicochemical properties of nickel-substituted MCM-41 by adjustment of the synthesis solution pH and tetramethylammonium silicate concentration
Publisher: American Chemical Society (ACS)
Date: 03-2006
DOI: 10.1021/JP054255G
Abstract: The effect of initial synthesis solution pH and tetramethylammonium silicate concentration in the synthesis solution on the physical and chemical properties of MCM-41 was systematically investigated using N(2) physisorption, X-ray diffraction, temperature-programmed reduction, in situ Fourier transform IR, UV-vis, and X-ray absorption spectroscopies. pH and tetramethylammonium (TMA) fraction affect the porosity of MCM-41 and the reducibility of incorporated Ni cations higher pH and TMA concentration produced more porosity with higher stability against reduction, which is attributed to more metal ions locating in the interior of the silica walls. The control of the pore diameter of mesoporous MCM-41 at the sub-nanometer scale may be accomplished by adjusting the pH and TMA fraction. pH may be used to control the surface free silanol group density and nickel reduction degree as well, and this is useful in the design of a specific catalyst for particular reactions, such as CO methanation, which requires highly dispersed, stable metallic clusters with controllable size.
Pressure-retarded membrane distillation for low-grade heat recovery: The critical roles of pressure-induced membrane deformation
Publisher: Elsevier BV
Date: 06-2019
A carbon science perspective in 2018: Current achievements and future challenges
Publisher: Elsevier BV
Date: 06-2018
An electroluminescent and tunable cavity-enhanced carbon-nanotube-emitter in the telecom band
Publisher: Springer Science and Business Media LLC
Date: 04-07-2023
DOI: 10.1038/S41467-023-39622-Y
Abstract: Emerging photonic information processing systems require chip-level integration of controllable nanoscale light sources at telecommunication wavelengths. Currently, substantial challenges remain in the dynamic control of the sources, the low-loss integration into a photonic environment, and in the site-selective placement at desired positions on a chip. Here, we overcome these challenges using heterogeneous integration of electroluminescent (EL), semiconducting carbon nanotubes (sCNTs) into hybrid two dimensional – three dimensional (2D-3D) photonic circuits. We demonstrate enhanced spectral line shaping of the EL sCNT emission. By back-gating the sCNT-nanoemitter we achieve full electrical dynamic control of the EL sCNT emission with high on-off ratio and strong enhancement in the telecommunication band. Using nanographene as a low-loss material to electrically contact sCNT emitters directly within a photonic crystal cavity enables highly efficient EL coupling without compromising the optical quality of the cavity. Our versatile approach paves the way for controllable integrated photonic circuits.
Metallicity‐Dependent Ultrafast Water Transport in Carbon Nanotubes
Publisher: Wiley
Date: 20-05-2020
Mechanical reinforcement of polyethylene using n- alkyl group-functionalized multiwalled carbon nanotubes: Effect of alkyl group carbon chain length and density
Publisher: Wiley
Date: 28-03-2013
DOI: 10.1002/PEN.23579
Probing the Diameter Limit of Single Walled Carbon Nanotubes in SWCNT: Fullerene Solar Cells
Publisher: Wiley
Date: 02-08-2016
Electrical detection of nitric oxide using single-walled carbon nanotube network devices
Publisher: Elsevier BV
Date: 08-2007
Synthesis and characterization of highly ordered Ni-MCM-41 mesoporous molecular sieves
Publisher: American Chemical Society (ACS)
Date: 16-06-2005
DOI: 10.1021/JP044227I
Abstract: Highly ordered Ni-MCM-41 s les with nearly atomically dispersed nickel ions were prepared reproducibly and characterized. Similar to the Co-MCM-41 s les, the pore diameter and porosity can be precisely controlled by changing the synthesis surfactant chain length. Nickel was incorporated by isomorphous substitution of silicon in the MCM-41 silica framework, which makes the Ni-MCM-41 a physically stable catalyst in harsh reaction conditions such as CO disproportionation to single wall carbon nanotubes or CO2 methanation. X-ray absorption spectroscopy results indicate that the overall local environment of nickel in Ni-MCM-41 was a tetrahedral or distorted tetrahedral coordination with surrounding oxygen anions. Hydrogen TPR revealed that our Ni-MCM-41 s les have high stability against reduction however, compared to Co-MCM-41, the Ni-MCM-41 has a lower reduction temperature, and both the H2-TPR and in situ XANES TPR reveal that the reducibility of nickel is not clearly correlated with the pore radius of curvature, as in the case of Co-MCM-41. This is probably a result of nickel being thermodynamically more easily reduced than cobalt. The stability of the structural order of Ni-MCM-41 has been investigated under SWNT synthesis and CO2 methanation reaction conditions as both require catalyst exposure to reducing environments leading to formation of metallic Ni clusters. Nitrogen physisorption and XRD results show that structural order was maintained under both SWNT synthesis and CO2 methanation reaction conditions. EXAFS results demonstrate that the nickel particle size can be controlled by different prereduction temperatures but not by the pore radius of curvature as in the case of Co-MCM-41.
Multifunctional Nanocomposites for Energy and Environmental Applications
Publisher: Wiley
Date: 12-01-2018
Electrodes and electrocatalysts for electrochemical hydrogen peroxide sensors: a review of design strategies
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2NH00006G
Abstract: A summary of the design strategies of electrodes and electrocatalysts for ultrasensitive electrochemical H 2 O 2 sensors with the nanomolar detection limits required in disease diagnosis and to avoid harmful exposure.
Sorting of Single-Walled Carbon Nanotubes Based on Metallicity by Selective Precipitation with Polyvinylpyrrolidone
Publisher: American Chemical Society (ACS)
Date: 04-03-2011
DOI: 10.1021/JP107865M
Foldable and scrollable graphene paper with tuned interlayer spacing as high areal capacity anodes for sodium-ion batteries
Publisher: Elsevier BV
Date: 10-2021
A novel synthesis route for bimetallic CoCr-MCM-41 catalysts with higher metal loadings. Their application in the high yield, selective synthesis of Single-Wall Carbon Nanotubes
Publisher: Elsevier BV
Date: 04-05-2010
A Flexible Rechargeable Zinc–Air Battery with Excellent Low‐Temperature Adaptability
Publisher: Wiley
Date: 04-02-2020
Abstract: Flexible zinc-air batteries (ZAB) are a promising battery candidate for emerging flexible electronic devices, but the catalysis-based working principle and unique semi-opened structure pose a severe challenge to their overall performance at cold temperature. Herein, we report the first flexible rechargeable ZAB with excellent low-temperature adaptability, based on the innovation of an efficient electrocatalyst to offset the electrochemical performance shrinkage caused by decreased temperature and a highly conductive hydrogel with a polarized terminal group to render the anti-freezing property. The fabricated ZABs show excellent electrochemical performances that outperform those of many aqueous ZABs at room temperature. They also deliver a high capacity of 691 mAh g
2D Material Based Advanced Membranes for Separations in Organic Solvents
Publisher: Wiley
Date: 20-11-2020
Co–Fe–Cr (oxy)Hydroxides as Efficient Oxygen Evolution Reaction Catalysts
Publisher: Wiley
Date: 31-01-2021
Double-photoelectrode redox desalination of seawater
Publisher: Elsevier BV
Date: 07-2023
Microbe-derived carbon materials for electrical energy storage and conversion
Publisher: Elsevier BV
Date: 03-2016
Catalytic activity atlas of ternary Co–Fe–V metal oxides for the oxygen evolution reaction
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA04088F
Abstract: Accurate composition–oxygen evolution reaction performance atlases have been established for a ternary Co–Fe–V oxide system using Prussian blue analogues as precursors, affording Co : Fe : V = 3 : 4 : 3 as the optimal metal ratio.
Low-defect, purified, narrowly (n,m)- Dispersed single-walled carbon nanotubes grown from cobalt- Incorporated MCM-41
Publisher: American Chemical Society (ACS)
Date: 30-11-2007
DOI: 10.1021/NN700106C
Abstract: A mild, four-step purification procedure using NaOH reflux, HCl wash, and oxidation by 4 mol % molecular oxygen at 500 degrees C was developed to purify single-walled carbon nanotubes (SWCNTs) with narrow semiconducting (n,m) distribution produced from cobalt-incorporated MCM-41 (Co-MCM-41) in order to obtain bulk low-defect-density nanotubes. Three key features of Co-MCM-41 allow this mild purification technique: (1) ultrathin silica walls versus dense silica or other crystalline oxide supports are soluble in dilute NaOH aqueous solution, which avoids the damage to SWCNTs usually caused by using HF treatment to remove catalytic supports (2) the small metallic particles are easily dissolved in HCl, a significantly milder chemical treatment compared to HF or HNO(3) (3) the high selectivity to SWCNTs with negligible multiwalled carbon nanotubes or graphite, which facilitates the removal of undesired carbon species by selective oxidation. The effectiveness of this purification procedure was evaluated by high-resolution transmission electron microscopy, scanning electron microscopy, Raman, UV-vis-NIR, and fluorescence spectroscopy, solution redox chemistry on fractionated (6,5) tubes, and SWCNT-based field effect transistor device performance. The results demonstrate that Co-MCM-41 catalyst not only provides tubes with narrow semiconducting (n,m) distribution but also allows a mild purification procedure and, therefore, produces SWCNTs with fewer defects.
How Is Cycle Life of Three-Dimensional Zinc Metal Anodes with Carbon Fiber Backbones Affected by Depth of Discharge and Current Density in Zinc–Ion Batteries?
Publisher: American Chemical Society (ACS)
Date: 02-03-2022
Single-wall carbon nanotube synthesis by CO disproportionation on nickel-incorporated MCM-41
Publisher: IOP Publishing
Date: 18-05-2005
DOI: 10.1088/0957-4484/16/7/023
Abstract: Both Ni- and Co-MCM-41 may be used for the synthesis of single-wall carbon nanotubes (SWNT). We present a comparative investigation that demonstrates that smaller diameter SWNT with a narrower distribution of diameters are produced using Co-MCM-41. Temperature-programmed reduction and x-ray absorption spectroscopy were used to measure the reducibility and metal cluster growth of Ni- and Co-MCM-41 in He, H(2) and under CO disproportionation reaction. The differences between these two catalysts can be attributed to a greater reducibility of and a greater CO affinity for Ni relative to Co.
Preparation of large particle MCM-41 and investigation on its fluidization behavior and application in single-walled carbon nanotube production in a fluidized-bed reactor
Publisher: Elsevier BV
Date: 09-2008
A hierarchically porous nickel–copper phosphide nano-foam for efficient electrochemical splitting of water
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6NR09864A
Abstract: Electrochemical splitting of water to produce oxygen (O
Pore curvature effect on the stability of Co-MCM-41 and the formation of size-controllable subnanometer Co clusters
Publisher: No publisher found
Date: 2005
DOI: 10.1021/JP048881+
Abstract: S les of Co-MCM-41 with different pore diameters have been synthesized using organic templates with different alkyl chain lengths. The reducibility of cobalt in these highly stable s les was investigated by TPR and X-ray absorption spectroscopy. We have found that the reducibility correlates strongly with the pore diameter of the MCM-41, with the cobalt incorporated in the smaller pore MCM-41 being more resistant to complete reduction. It is proposed that the distribution of cobalt ions in the pore wall is affected by both the preparation procedure and the pore diameter. The size of the metallic Co clusters formed after different reducing treatments correlates linearly with the pore size, giving direct evidence for the effect of the radius of curvature on reducibility. Complete cobalt reduction after TPR causes an inverse variation of the cluster size with the pore size, resulting from differences in the density of Co clusters and from differences in the rate of Co migration and aggregation outside the pores of MCM-41 with different pore sizes.
High-purity separation of gold nanoparticle dimers and trimers
Publisher: American Chemical Society (ACS)
Date: 10-03-2009
DOI: 10.1021/JA900809Z
Abstract: An effective method was developed for separating gold-nanoparticle clusters in high resolution dimer and trimer s les were obtained with 95% and 81% purity, respectively.
Ionic liquid gating of single-walled carbon nanotube devices with ultra-short channel length down to 10 nm
Publisher: AIP Publishing
Date: 08-02-2021
DOI: 10.1063/5.0034792
Abstract: Ionic liquids enable efficient gating of materials with nanoscale morphology due to the formation of a nanoscale double layer that can also follow strongly vaulted surfaces. On carbon nanotubes, this can lead to the formation of a cylindrical gate layer, allowing an ideal control of the drain current even at small gate voltages. In this work, we apply ionic liquid gating to chirality-sorted (9, 8) carbon nanotubes bridging metallic electrodes with gap sizes of 20 nm and 10 nm. The single-tube devices exhibit diameter-normalized current densities of up to 2.57 mA/μm, on-off ratios up to 104, and a subthreshold swing down to 100 mV/dec. Measurements after long vacuum storage indicate that the hysteresis of ionic liquid gated devices depends not only on the gate voltage sweep rate and the polarization dynamics but also on charge traps in the vicinity of the carbon nanotube, which, in turn, might act as trap states for the ionic liquid ions. The ambipolar transfer characteristics are compared with calculations based on the Landauer–Büttiker formalism. Qualitative agreement is demonstrated, and the possible reasons for quantitative deviations and possible improvements to the model are discussed. Besides being of fundamental interest, the results have potential relevance for biosensing applications employing high-density device arrays.
Hierarchical honeycomb graphene aerogels reinforced by carbon nanotubes with multifunctional mechanical and electrical properties
Publisher: Elsevier BV
Date: 04-2021
Cobalt Nanoparticles Confined in Carbon Cages Derivedfrom Zeolitic Imidazolate Frameworks as Efficient Oxygen Electrocatalysts for Zinc-Air Batteries
Publisher: Wiley
Date: 29-01-2019
Effect of different carbon sources on the growth of single-walled carbon nanotube from MCM-41 containing nickel
Publisher: Elsevier BV
Date: 10-2007
Thermally assisted efficient electrochemical lithium extraction from simulated seawater
Publisher: Elsevier BV
Date: 09-2022
DOI: 10.1016/J.WATRES.2022.118969
Abstract: Extracting lithium electrochemically from seawater has the potential to resolve any future lithium shortage. However, electrochemical extraction only functions efficiently in high lithium concentration solutions. Herein, we discovered that lithium extraction is temperature and concentration dependent. Lithium extraction capacity (i.e., the mass of lithium extracted from the source solutions) and speed (i.e., the lithium extraction rate) in electrochemical extraction can be increased significantly in heated source solutions, especially at low lithium concentrations (e.g., < 3 mM) and high Na
Preparation of spherical large-particle MCM-41 with a broad particle-size distribution by a modified pseudomorphic transformation
Publisher: Elsevier BV
Date: 05-2009
(Invited) Space-Confined Assembly of All-Carbon Hybrid Fibers for Capacitive Energy Storage
Publisher: The Electrochemical Society
Date: 15-04-2017
Abstract: Miniaturized portable and wearable electronics have erse power requirements, ranging from one microwatt to several milliwatts. Fiber-based micro-supercapacitors are promising energy storage devices that can address these manifold power requirements. Here, we demonstrate a hydrothermal assembly method using space confinement fillers to control the formation of nitrogen doped reduced graphene oxide and multi-walled carbon nanotube hybrid fibers. Consequently, the all-carbon hybrid fibers have tunable geometries, while maintaining good electrical conductivity, high ion-accessible surface area and mechanical strength this allows us to address two important issues in micro-supercapacitor research. First, we found a clear correlation between the geometry of the hybrid fibers and their capacitive energy storage properties. Thinner fibers (30 mm in diameter) have higher specific volumetric capacitance (281 F cm - 3 ), superior rate capability, and better length dependent performance. In contrast, larger-diameter hybrid fibers (236 mm in diameter) can achieve much higher specific length capacitance (42 mF cm -1 ). Second, we realized the first built-to-order concept for micro-supercapacitors by using all-carbon hybrid fibers with ersified geometry as electrodes. The device energy can cover two orders of magnitude, from .1 μW h to nearly 10 μW h, and the device power can be tuned in four orders of magnitude, from 0.2 μW to 2000 μW. Furthermore, multiple mechanically flexible fiber-based micro-supercapacitors can be integrated into complex energy storage units with wider operation voltage windows, demonstrating broad application potentials in flexible devices. Figure 1
IN SITU FORMATION OF COBALT NANOCLUSTERS IN SOL–GEL SILICA FILMS FOR SINGLE-WALLED CARBON NANOTUBE GROWTH
Publisher: World Scientific Pub Co Pte Lt
Date: 04-2009
DOI: 10.1142/S1793292009001563
Abstract: A facile method was developed for in situ formation of Co nanoclusters in sol–gel silica thin films spin-coated on Si wafers. The size and density of Co nanoclusters can be controlled by spin-coating speeds, annealing methods, reduction temperatures under H 2 , and metal precursor concentrations in tetraethylorthosilicate solutions. The optimized preparation condition, spin-coating speed of 9000 rpm, annealing at 500°C in air followed by reduction at 800°C in H 2 , resulted in silica films as thin as 60 nm and Co nanoclusters with a mean diameter of 1.5 nm. Morphological and chemical characteristics of thin films and nanoclusters were studied by atomic force microscopy and X-ray photoelectron spectroscopy, respectively. Subsequently, these Co nanoclusters were successfully used to grow SWCNTs by CO decomposition. Film containing Co monometallic clusters produced SWCNTs of 1.3 nm in diameter, whereas film having Co/Mo bimetallic clusters produced SWCNTs of 0.9 nm. This sol–gel approach allowed not only easy catalyst patterning on a thin film but also a fine-tuning of SWCNT properties, e.g., diameter.
Bifunctional catalysts for heterogeneous electro-Fenton processes: a review
Publisher: Springer Science and Business Media LLC
Date: 18-05-2022
DOI: 10.1007/S10311-022-01453-6
Abstract: Fenton processes allow to degrade and mineralize toxic organic contaminants, yet classical Fenton processes require continuously adding hydrogen peroxide and ferrous ions, costly solution pH adjustment, and treatment of secondary iron sludge pollution. Heterogeneous electro-Fenton processes deliver oxidizing radicals with only oxygen and electricity consumed. Bifunctional catalysts allow the synthesis and activation of hydrogen peroxide simultaneously, eliminate additional chemical reagents, and yield no metal residues in treated water. Here, we review bifunctional catalysts for heterogeneous electro-Fenton processes. We describe the mechanisms of oxidizing radical generation from oxygen. Then, we compare different types of bifunctional catalysts based on their elemental compositions: (1) metal/carbon composite catalysts, i.e., monometallic iron/carbon composite catalysts, bimetallic/trimetallic carbon composite catalysts, and transition metal single-atom catalysts (2) metal composite catalysts without carbon and (3) metal-free carbon catalysts. Then, we present five other approaches beyond electrocatalysts, which have been used to improve the performance of heterogeneous electro-Fenton processes.
Carbon and Carbon/Metal Hybrid Structures Enabled by Ultrafast Heating Methods
Publisher: Wiley
Date: 13-09-2022
Abstract: High‐temperature thermal treatment is a standard step in synthesis of many materials. Recently, ultrafast heating methods, such as Joule heating, laser, light, or microwave irradiations, have been used to create novel carbon materials and carbon/metal hybrid structures, demonstrating unique and often superior properties compared with those synthesized by conventional heating methods. They have shown promising application potentials in catalysis, batteries, supercapacitors, fuel cells, sensors, implants, actuators, lighting devices, and waste recycling. Herein, recent findings in creating novel carbon and carbon/metal hybrid structures by ultrafast heating methods are reviewed. The most frequently used ultrafast heating methods, their advantages, and their limitations are first described. Then, different carbon structures created by these methods, including graphene, reduced graphene oxide, hard carbon, carbon nanotube architectures, and other carbon hybrids, are summarized. Next, novel carbon/metal hybrid structures are reviewed, including carbon‐supported nanoparticles of monometals, metal alloys, metal composites, high‐entropy alloys, and single‐atom catalysts. Heating methods, critical precursors used, synthesis parameters affecting material structures, and mechanistic understanding of their unique synthesis processes are focused on. The essential properties of these novel structures and their applications are also summarized. Finally, knowledge gaps and technical challenges in using these methods for scalable material production are discussed.
Sandwich-Architectured Poly(lactic acid)–Graphene Composite Food Packaging Films
Publisher: American Chemical Society (ACS)
Date: 06-04-2016
Abstract: Biodegradable food packaging promises a more sustainable future. Among the many different biopolymers used, poly(lactic acid) (PLA) possesses the good mechanical property and cost-effectiveness necessary of a biodegradable food packaging. However, PLA food packaging suffers from poor water vapor and oxygen barrier properties compared to many petroleum-derived ones. A key challenge is, therefore, to simultaneously enhance both the water vapor and oxygen barrier properties of the PLA food packaging. To address this issue, we design a sandwich-architectured PLA-graphene composite film, which utilizes an impermeable reduced graphene oxide (rGO) as the core barrier and commercial PLA films as the outer protective encapsulation. The synergy between the barrier and the protective encapsulation results in a significant 87.6% reduction in the water vapor permeability. At the same time, the oxygen permeability is reduced by two orders of magnitude when evaluated under both dry and humid conditions. The excellent barrier properties can be attributed to the compact lamellar microstructure and the hydrophobicity of the rGO core barrier. Mechanistic analysis shows that the large rGO lateral dimension and the small interlayer spacing between the rGO sheets have created an extensive and tortuous diffusion pathway, which is up to 1450-times the thickness of the rGO barrier. In addition, the sandwiched architecture has imbued the PLA-rGO composite film with good processability, which increases the manageability of the film and its competency to be tailored. Simulations using the PLA-rGO composite food packaging film for edible oil and potato chips also exhibit at least eight-fold extension in the shelf life of these oxygen and moisture sensitive food products. Overall, these qualities have demonstrated the high potential of a sandwich-architectured PLA-graphene composite film for food packaging applications.
Recognition of carbon nanotube chirality by phage display
Publisher: IEEE
Date: 2010
E. coli-derived carbon with nitrogen and phosphorus dual functionalities for oxygen reduction reaction
Publisher: Elsevier BV
Date: 07-2015
Prussian blue, its analogues and their derived materials for electrochemical energy storage and conversion
Publisher: Elsevier BV
Date: 03-2020
The role of molecular studies in lymphoma diagnosis
Publisher: Elsevier BV
Date: 02-2004
Novel Poly(l-lactide)/graphene oxide films with improved mechanical flexibility and antibacterial activity
Publisher: Elsevier BV
Date: 12-2017
DOI: 10.1016/J.JCIS.2017.08.013
Abstract: Poly(l-lactic acid) (PLLA) is a biocompatible polyester derived from renewable sources. It is desirable to reduce its brittleness and introduce antibacterial activity for biomedical applications by using graphene oxide (GO) as a structural and antibacterial agent. However, commonly used polymer/GO composite synthesis methods, such as physical mixing and covalent functionalization, either cause phase segregation or compromise the intrinsic properties of GO. Here, a novel approach is demonstrated to synthesize PLLA/GO films. First, perylene bisimides-containing PLLA (PBI-PLLA) was synthesized via ring-opening polymerization of l-lactide using a hydroxyl-derivate of perylene bisimides (PBI-OH) as the initiator. Next, PBI-PLLA was conjugated with GO via π-π stacking to form PLLA-conjugated GO (PLLA-c-GO). Last, PLLA/GO films were fabricated by simple solution casting of commercial PLLA and PLLA-c-GO dissolved in chloroform. Detailed characterization shows that GO retains its morphology and functional groups in PLLA-c-GO, which enables unique properties in the PLLA/GO films. The starting thermal degradation temperature of PLLA/GO films in N
Catalysts for chirality selective synthesis of single-walled carbon nanotubes
Publisher: Elsevier BV
Date: 2015
Interfacial engineering of graphenic carbon electrodes by antimicrobial polyhexamethylene guanidine hydrochloride for ultrasensitive bacterial detection
Publisher: Elsevier BV
Date: 04-2020
Graphene-Based Fiber Supercapacitors
Publisher: American Chemical Society (ACS)
Date: 08-2022
Drying graphene hydrogel fibers for capacitive energy storage
Publisher: Elsevier BV
Date: 08-2020
One-Dimensional van der Waals Heterostructures as Efficient Metal-Free Oxygen Electrocatalysts
Publisher: American Chemical Society (ACS)
Date: 25-01-2021
Cobalt sulfide catalysts for single-walled carbon nanotube synthesis
Publisher: Elsevier BV
Date: 04-2021
All‐Carbon Nanoarchitectures as High‐Performance Separation Membranes with Superior Stability
Publisher: Wiley
Date: 06-11-2015
Hydrothermal assembly of micro-nano-integrated core-sheath carbon fibers for high-performance all-carbon micro-supercapacitors
Publisher: Elsevier BV
Date: 10-2017
Enabling highly efficient, flexible and rechargeable quasi-solid-state zn-air batteries via catalyst engineering and electrolyte functionalization
Publisher: Elsevier BV
Date: 07-2019
Radius of curvature effect on the selective oxidation of cyclohexene over highly ordered V-MCM-41
Publisher: Springer Science and Business Media LLC
Date: 17-07-2007
Synthesis of noble metal-based intermetallic electrocatalysts by space-confined pyrolysis: Recent progress and future perspective
Publisher: Elsevier BV
Date: 09-2021
Asymmetric deposition of manganese oxide in single walled carbon nanotube films as electrodes for flexible high frequency response electrochemical capacitors
Publisher: Elsevier BV
Date: 09-2012
Two-dimensional material membrane fabrication: progress and challenges
Publisher: Elsevier BV
Date: 03-2023
Activity and stability comparison of immobilized NADH oxidase on multi-walled carbon nanotubes, carbon nanospheres, and single-walled carbon nanotubes
Publisher: Elsevier BV
Date: 05-2011
Assessment of (n,m) selectively enriched small diameter single-walled carbon nanotubes by density differentiation from cobalt-incorporated MCM-41 for macroelectronics
Publisher: American Chemical Society (ACS)
Date: 25-11-2008
DOI: 10.1021/CM8017677
Antimicrobial graphene materials: the interplay of complex materials characteristics and competing mechanisms
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7BM00987A
Abstract: This minireview attempts to correlate the complex structure–property relationship with the antimicrobial mechanisms of graphene materials.
Biomass-derived nanocarbon materials for biological applications: challenges and prospects
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TB01027H
Abstract: This review discusses the current status and future potential of biomass-derived nanocarbons for a wide range of biomedical/environmental applications, including bioimaging, microbial inactivation, wound care, and microbial electrochemical systems.
Dextran: A Multifunctional and Universal Electrolyte Additive for Aqueous Zn Ion Batteries
Publisher: Wiley
Date: 13-08-2023
Abstract: The aqueous Zn ion battery (ZIB) is a potentially sustainable energy storage device. However, its performance is still far from satisfactory. Herein, it is demonstrated that a branched sugar, dextran, widely used in eyedrop products to relieve irritated eyes, is a multifunctional and universal electrolyte additive to enable high‐performance ZIBs. Experimental and theoretical results reveal that dextran has four functions: forming a surface protective layer to minimize side reactions, facilitating stepwise [Zn(H 2 O) 6 ] 2+ desolvation, preferably adsorbing on Zn(0002) planes to supply desolvated Zn 2+ and homogenizing electric field. These functions are universally observed in Zn(CF 3 SO 3 ) 2 , ZnSO 4 , Zn(ClO 4 ) 2 , and ZnCl 2 aqueous electrolytes. As demonstrations for practical applications, Zn anodes deliver Coulombic efficiency of 99.97% after 3400 cycles in an electrolyte with 50 mg mL ‒1 of dextran and cumulative plating capacity of 3400 mAh cm ‒2 at 5 mA cm ‒2 . Zn//V 2 O 5 full cells with a low negative ositive electrode capacity ratio of 2.18 can be stably cycled over 138 cycles at 1 A g ‒1 . Pouch full cells can work under mechanical bending conditions. Zn/ olyaniline full cells can cycle steadily for 3000 cycles at 0.5 A g ‒1 at −10 °C. Dextran shows excellent potential as a low‐cost and non‐toxic electrolyte additive to enable safe and reliable ZIBs.
Contact spacing controls the on-current for all-carbon field effect transistors
Publisher: Springer Science and Business Media LLC
Date: 18-11-2021
DOI: 10.1038/S42005-021-00747-5
Abstract: All-carbon field-effect transistors, which combine carbon nanotubes and graphene hold great promise for many applications such as digital logic devices and single-photon emitters. However, the understanding of the physical properties of carbon nanotube (CNT)/graphene hybrid systems in such devices remained limited. In this combined experimental and theoretical study, we use a quantum transport model for field-effect transistors based on graphene electrodes and CNT channels to explain the experimentally observed low on currents. We find that large graphene/CNT spacing and short contact lengths limit the device performance. We have also elucidated in this work the experimentally observed ambipolar transport behavior caused by the flat conduction- and valence-bands and describe non-ideal gate-control of the contacts and channel region by the quantum capacitance of graphene and the carbon nanotube. We hope that our insights will accelerate the design of efficient all-carbon field-effect transistors.
Spray drying assisted synthesis of porous carbons from whey powders for capacitive energy storage
Publisher: Elsevier BV
Date: 03-2018
Synthesis of (9,8) single-walled carbon nanotubes on CoSO4/SiO2 catalysts: The effect of Co mass loadings
Publisher: Elsevier BV
Date: 11-2020
Lithium Manganate Wrapped with Ion-Selective Graphene Coatings for Thermally Assisted Lithium Extraction from Simulated Seawater
Publisher: American Chemical Society (ACS)
Date: 07-09-2023
Toward Flexible Zinc‐Ion Hybrid Capacitors with Superhigh Energy Density and Ultralong Cycling Life: The Pivotal Role of ZnCl2 Salt‐Based Electrolytes
Publisher: Wiley
Date: 03-11-2021
Abstract: Zinc ion hybrid capacitors (ZIHCs) are promising energy storage devices for emerging flexible electronics, but they still suffer from trade‐off in energy density and cycling life. Herein, we show that such a dilemma can be well‐addressed by deploying ZnCl 2 based electrolytes. Combining experimental studies and density functional theory (DFT) calculations, for the first time, we demonstrate an intriguing chloride ion (Cl − ) facilitated desolvation mechanism in hydrated [ZnCl] + (H 2 O) n−1 (with n=1–6) clusters. Based on this mechanism, a water‐in‐salt type hydrogel electrolyte filled with ZnCl 2 was developed to concurrently improve the energy storage capacity of porous carbon materials and the reversibility of Zn metal electrode. The resulting ZIHCs deliver a battery‐level energy density up to 217 Wh kg −1 at a power density of 450 W kg −1 , an unprecedented cycling life of 100 000 cycles, together with excellent low‐temperature adaptability and mechanical flexibility.
Bacterial physiology is a key modulator of the antibacterial activity of graphene oxide
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6NR05745D
Abstract: Carbon-based nanomaterials have a great potential as novel antibacterial agents however, their interactions with bacteria are not fully understood. This study demonstrates that the antibacterial activity of graphene oxide (GO) depends on the physiological state of cells for both Gram-negative and -positive bacteria. GO susceptibility of bacteria is the highest in the exponential growth phase, which are in growing physiology, and stationary-phase (non-growing) cells are quite resistant against GO. Importantly, the order of GO susceptibility of E. coli with respect to the growth phases (exponential ≫ decline > stationary) correlates well with the changes in the envelope ultrastructures of the cells. Our findings are not only fundamentally important but also particularly critical for practical antimicrobial applications of carbon-based nanomaterials.
Antibacterial activity of graphite, graphite oxide, graphene oxide, and reduced graphene oxide: Membrane and oxidative stress
Publisher: American Chemical Society (ACS)
Date: 24-08-2011
DOI: 10.1021/NN202451X
Abstract: Health and environmental impacts of graphene-based materials need to be thoroughly evaluated before their potential applications. Graphene has strong cytotoxicity toward bacteria. To better understand its antimicrobial mechanism, we compared the antibacterial activity of four types of graphene-based materials (graphite (Gt), graphite oxide (GtO), graphene oxide (GO), and reduced graphene oxide (rGO)) toward a bacterial model-Escherichia coli. Under similar concentration and incubation conditions, GO dispersion shows the highest antibacterial activity, sequentially followed by rGO, Gt, and GtO. Scanning electron microscope (SEM) and dynamic light scattering analyses show that GO aggregates have the smallest average size among the four types of materials. SEM images display that the direct contacts with graphene nanosheets disrupt cell membrane. No superoxide anion (O(2)(•-)) induced reactive oxygen species (ROS) production is detected. However, the four types of materials can oxidize glutathione, which serves as redox state mediator in bacteria. Conductive rGO and Gt have higher oxidation capacities than insulating GO and GtO. Results suggest that antimicrobial actions are contributed by both membrane and oxidation stress. We propose that a three-step antimicrobial mechanism, previously used for carbon nanotubes, is applicable to graphene-based materials. It includes initial cell deposition on graphene-based materials, membrane stress caused by direct contact with sharp nanosheets, and the ensuing superoxide anion-independent oxidation. We envision that physicochemical properties of graphene-based materials, such as density of functional groups, size, and conductivity, can be precisely tailored to either reducing their health and environmental risks or increasing their application potentials.
Construction of unconventional hexapod-like tellurium nanostructure with morphology-dependent photoluminescence property
Publisher: American Chemical Society (ACS)
Date: 06-05-2009
DOI: 10.1021/JP902171X
Milk powder-derived bifunctional oxygen electrocatalysts for rechargeable Zn-air battery
Publisher: Elsevier BV
Date: 03-2018
A Flexible Rechargeable Zinc–Air Battery with Excellent Low‐Temperature Adaptability
Publisher: Wiley
Date: 04-02-2020
Mesostructured SBA-16 with excellent hydrothermal, thermal and mechanical stabilities: Modified synthesis and its catalytic application
Publisher: Elsevier BV
Date: 05-2009
DOI: 10.1016/J.JCIS.2009.01.071
Abstract: We report a modified method to synthesize SBA-16 mesostructured silica under refluxing condition using block co-polymer poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (F127) as template, cetyltrimethylammonium bromide (CTAB) as co-template, and tetraethyl orthosilicate (TEOS) as silica source. The physiochemical properties of SBA-16 silica were characterized by X-ray diffraction (XRD), nitrogen physisorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and (29)Si solid-state nuclear magnetic resonance (NMR). The resulting SBA-16 silica exhibited highly ordered mesoporous structure, mono-dispersed spherical morphology, excellent hydrothermal, thermal and mechanical stabilities. It was worth mentioning that the synthesis time can be significantly reduced from 48 h to 8 h, which opened a feasible way to produce SBA-16 silica in a large scale. Moreover, the "super-cage" pore structure of SBA-16 encapsulated gold nanoparticles in a "ship in a bottle" way. The well-confined gold nanoparticles (mean size of 5 nm) with a narrow particle size distribution were highly active in solvent-free benzyl alcohol selective oxidation with molecular oxygen.
The effect of synthesis solution pH on the physicochemical properties of Co substituted MCM-41
Publisher: Springer Science and Business Media LLC
Date: 05-2005
Novel LiAlO2 Material for Scalable and Facile Lithium Recovery Using Electrochemical Ion Pumping
Publisher: MDPI AG
Date: 27-02-2023
DOI: 10.3390/NANO13050895
Abstract: In this study, α-LiAlO2 was investigated for the first time as a Li-capturing positive electrode material to recover Li from aqueous Li resources. The material was synthesized using hydrothermal synthesis and air annealing, which is a low-cost and low-energy fabrication process. The physical characterization showed that the material formed an α-LiAlO2 phase, and electrochemical activation revealed the presence of AlO2* as a Li deficient form that can intercalate Li+. The AlO2*/activated carbon electrode pair showed selective capture of Li+ ions when the concentrations were between 100 mM and 25 mM. In mono salt solution comprising 25 mM LiCl, the adsorption capacity was 8.25 mg g−1, and the energy consumption was 27.98 Wh mol Li−1. The system can also handle complex solutions such as first-pass seawater reverse osmosis brine, which has a slightly higher concentration of Li than seawater at 0.34 ppm.
3d Transition‐Metal‐Mediated Columbite Nanocatalysts for Decentralized Electrosynthesis of Hydrogen Peroxide
Publisher: Wiley
Date: 10-03-2021
Tuning of electrical characteristics in networked carbon nanotube field-effect transistors using thiolated molecules
Publisher: AIP Publishing
Date: 03-09-2007
DOI: 10.1063/1.2772181
Abstract: The authors examine the effects of adsorption of four thiolated molecules (HS–C10H21, HS–C11H22OH, HS–C10H20COOH, and HS–C2H4C4F9) on the electrical characteristics of single-walled carbon nanotube network FETs (SNFETs). Work function of the electrodes was measured before and after molecule adsorption. Schottky barrier energy extraction for SNFETs was also performed and the results provide direct evidence that the device characteristics of SNFETs after SAM adsorption are altered primarily due to the change in energy-level alignment between the Au and SWNTs, which thus provides an effective methodology for the tuning and performance optimization of these devices in a controllable way.
Application of the generalized 2D correlation analysis to dynamic near-edge X-ray absorption spectroscopy data
Publisher: American Chemical Society (ACS)
Date: 19-01-2005
DOI: 10.1021/JA045391M
Abstract: Application of the generalized 2D correlation analysis to a series of in situ XANES spectra enabled the determination of additional useful information not readily available from the conventional spectra. In addition to the changes in the intensity of the white line and in the pre-edge feature, readily observable in the regular spectra, the generalized 2D correlation analysis clearly evidenced an otherwise imperceptible shift in the main edge energy caused by the gradual reduction of Co(2+) to metallic cobalt. The 2D correlation spectra also allowed the establishment of a time sequence for the changes occurring in the spectral features during hydrogen reduction, which provides valuable information on the reduction mechanism. While the generalized 2D correlation analysis was found to be very useful in obtaining supplementary information from the series of XANES spectra analyzed, interpretation of the correlation intensities should be checked for consistency with the general trend of each spectral feature, as spectral intensities that do not change monotonically may induce changes in the signs of the correlation intensities leading to inaccurately establishing sequences of changes among the spectral features in the series.
1D Supercapacitors for Emerging Electronics: Current Status and Future Directions
Publisher: Wiley
Date: 15-07-2019
Abstract: 1D supercapacitors (SCs) have emerged as promising candidates to power emerging electronics in recent years because of their unique advantages in energy storage and mechanical flexibility. There are four main research fronts in the development of 1D SCs: 1) enhancing mechanical characteristics, 2) achieving superior electrochemical performance, 3) enabling multiple device integration, and 4) demonstrating multifunctionality. Here, a brief history of 1D SCs is presented and significant research achievements regarding the four fronts identified as the main pillars of the development of 1D SCs are highlighted. The current challenges of the fabrication and utilization of 1D SCs are critically examined and potential solutions are analyzed. Plus, the performance inconsistencies arising from the improper use and extreme ersity of performance evaluation and reporting methods are highlighted. Beyond, perspectives on future efforts are provided and goals regarding the four research fronts are set, to further push 1D SCs toward practical applications. The development of 1D SCs is summarized here, with existing obstacles diagnosed, corresponding solutions proposed, and future directions indicated accordingly.
Selective Small-Diameter Metallic Single-Walled Carbon Nanotube Removal by Mere Standing with Anthraquinone and Application to a Field-Effect Transistor
Publisher: American Chemical Society (ACS)
Date: 19-11-2010
DOI: 10.1021/JP106398K
The on-demand engineering of metal-doped porous carbon nanofibers as efficient bifunctional oxygen catalysts for high-performance flexible Zn–air batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9TA13651G
Abstract: A dual-functional metal template achieves on-demand control of metal–N–C sites, porous structures, and surface wettability in a carbon nanofiber catalyst, enabling flexible zinc–air batteries with outstanding performance under various mechanical deformations.
Hydrogen evolution reaction activity of nickel phosphide is highly sensitive to electrolyte pH
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7TA06000A
Abstract: Nickel phosphide has a much higher catalytic activity for the hydrogen evolution reaction in strongly acidic and basic electrolytes.
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
Zinc–Air Battery-Based Desalination Device
Publisher: American Chemical Society (ACS)
Date: 05-05-2020
Carbon science perspective in 2020: Current research and future challenges
Publisher: Elsevier BV
Date: 05-2020
Toward the extraction of single species of single-walled carbon nanotubes using fluorene-based polymers
Publisher: American Chemical Society (ACS)
Date: 15-09-2007
DOI: 10.1021/NL071349O
Abstract: High purity of (7,5) SWNTs (approximately 79% of the semisonducting SWNT ensemble) can be obtained by polymer-assisted extraction from the narrow-diameter distributed SWNTs produced by the catalyst Co-MCM-41. The fluorene-based polymers are able to selectively wrap the single-walled carbon nanotubes (SWNTs) with certain chiral angles or diameters depending on their chemical structures. Poly(9,9-dioctyfluoreny1-2, 7-diyl) and poly[(9,9-dihexylfluorenyl-2,7-diyl)-co-(9,10-anthracene)] selectively wrap SWNTs with high chiral angles (>24.5 degrees). By contrast, poly[9,9-dioctylfluorenyl-2,7-diyl)-co-1,4-benzo-{2,1'-3}-thiadiazole)] preferentially wraps the SWNTs with certain diameter (1.02-1.06 nm).
Solution-processable carbon nanotubes for semiconducting thin-film transistor devices
Publisher: Wiley
Date: 19-03-2010
Space-confined assembly of all-carbon hybrid fibers for capacitive energy storage: realizing a built-to-order concept for micro-supercapacitors
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5EE02703A
Abstract: Customized hybrid carbon fiber supercapacitors with energy across two orders and power across four orders of magnitude.
Synthesis of graphene materials by electrochemical exfoliation: Recent progress and future potential
Publisher: Wiley
Date: 17-10-2019
DOI: 10.1002/CEY2.14
Abstract: Synthesis of structurally controlled graphene materials is critical for realizing their practical applications. The electrochemical exfoliation of graphite has emerged as a simple method to produce graphene materials. This review examines research progress in the last 5 years, from 2015 to 2019. Graphene material synthesis methods generally have a trade‐off between increasing production yield and achieving better material property control. The synthesis conditions for synthesizing pristine graphene, graphene oxide (GO), and graphene composites are significantly different. Thus, in this review, we first discuss synthesis methods for graphene materials with high C/O ratios from four aspects: graphite electrodes, equipment engineering, electrolytes, and additional reduction methods. Next, we survey synthesis methods for GO and examine how the pretreatment of the graphite electrodes, electrolytes, and operation parameters, such as applied voltages, electrolyte temperatures, and mechanical forces, affect the quality of GO. Further, we summarize electrochemical exfoliation methods used to dope graphene materials, introduce covalent functional groups, incorporate various nanoparticles, and assembly of graphene architectures. For all synthesis methods, we compare the properties of resulting graphene materials such as C/O ratios, lateral size, layer numbers, and quality characterized by Raman spectroscopy. Lastly, we propose our perspectives on further research. We hope this review stimulates more studies to realize the on‐demand production of graphene materials with desired properties using electrochemical exfoliation methods.
Pressure-induced single-walled carbon nanotube (n,m) selectivity on Co-Mo catalysts
Publisher: American Chemical Society (ACS)
Date: 19-09-2007
DOI: 10.1021/JP0762525
Rechargeable zinc-air batteries with neutral electrolytes: Recent advances, challenges, and prospects
Publisher: Elsevier BV
Date: 07-2021
Textile energy storage: Structural design concepts, material selection and future perspectives
Publisher: Elsevier BV
Date: 04-2016
Synthesis of free-standing carbon nanohybrid by directly growing carbon nanotubes on air-sprayed graphene oxide paper and its application in supercapacitor
Publisher: Elsevier BV
Date: 04-2015
Covalent immobilization of nisin on multi-walled carbon nanotubes: Superior antimicrobial and anti-biofilm properties
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1NR10024F
Abstract: Despite unique and useful properties of multi-walled carbon nanotubes (MWNTs) such as high strength and a low synthesis cost, their weak antimicrobial property h ers their use as an antimicrobial material. Herein, we demonstrate that the immobilization of nisin, a natural and inexpensive antimicrobial peptide, with poly(ethylene glycol) (PEG(1000)) as a linker significantly enhanced the antimicrobial and anti-biofilm properties of MWNTs. The MWNT-nisin composite showed up to 7-fold higher antimicrobial property than pristine MWNTs against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and Bacillus subtilis. Moreover, the MWNT-nisin composite had a dramatically improved capability to prevent biofilm formation both on a deposited film and in suspension. In particular, the MWNT-nisin deposit film exhibited a 100-fold higher anti-biofilm property than the MWNT deposit film. Further, it has been shown that PEG and nisin are covalently attached to MWNTs with excellent stability against leaching. We envision that our novel MWNT-nisin composite can serve as an effective and economical antimicrobial material.
Naturally derived honeycomb-like N,S-codoped hierarchical porous carbon with MS2 (M = Co, Ni) decoration for high-performance Li–S battery
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9NR10419D
Abstract: A 3D electrocatalyst designed by ginkgo-nut derived porous carbon with CoS 2 nanoparticles decoration exhibits a high Li–S battery performance. This is ascribed to a high binding energy towards LiPSs and a low Li + diffusion energy barrier of CoS 2 .
Nano-RuO2-Decorated Holey Graphene Composite Fibers for Micro-Supercapacitors with Ultrahigh Energy Density
Publisher: Wiley
Date: 07-06-2018
Abstract: Compactness and versatility of fiber-based micro-supercapacitors (FMSCs) make them promising for emerging wearable electronic devices as energy storage solutions. But, increasing the energy storage capacity of microscale fiber electrodes, while retaining their high power density, remains a significant challenge. Here, this issue is addressed by incorporating ultrahigh mass loading of ruthenium oxide (RuO
Developments in Catalytic Methodology for (n, m) Selective Synthesis of SWNTs
Publisher: Jenny Stanford Publishing
Date: 21-12-2013
DOI: 10.1201/B15490-4
Formation of single-walled carbon nanotube thin films enriched with semiconducting nanotubes and their application in photoelectrochemical devices
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0NR00986E
Abstract: Single-walled carbon nanotube (SWCNT) thin films, containing a high-density of semiconducting nanotubes, were obtained by a gel-centrifugation method. The agarose gel concentration and centrifugation force were optimized to achieve high semiconducting and metallic nanotube separation efficiency at 0.1 wt% agarose gel and 18,000g. The thickness of SWCNT films can be precisely controlled from 65 to 260 nm with adjustable transparency. These SWCNT films were applied in photoelectrochemical devices. Photocurrents generated by semiconducting SWCNT enriched films are 15-35% higher than those by unsorted SWCNT films. This is because of reducing exciton recombination channels as a result of the removal of metallic nanotubes. Thinner films generate higher photocurrents because charge carriers have less chances going in metallic nanotubes for recombination, before they can reach electrodes. Developing more scalable and selective methods for high purity semiconducting SWCNTs is important to further improve the photocurrent generation efficiency by using SWCNT-based photoelectrochemical devices.
High selectivity cum yield gel electrophoresis separation of single-walled carbon nanotubes using a chemically selective polymer dispersant
Publisher: American Chemical Society (ACS)
Date: 02-05-2012
DOI: 10.1021/JP211562P
Thermo-osmosis-Coupled Thermally Regenerative Electrochemical Cycle for Efficient Lithium Extraction
Publisher: American Chemical Society (ACS)
Date: 26-01-2021
Graphene oxide laminates intercalated with 2D covalent-organic frameworks as a robust nanofiltration membrane
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA01727B
Abstract: Porous yet rigid 2D covalent–organic framework nanosheets can not only increase the interlayer spacing between graphene oxide nanosheets and provide direct transfer channels but also enhance the self-supporting capacity of graphene oxide laminates.
Big to Small: Ultrafine Mo 2 C Particles Derived from Giant Polyoxomolybdate Clusters for Hydrogen Evolution Reaction
Publisher: Wiley
Date: 08-02-2019
Abstract: Due to its electronic structure, similar to platinum, molybdenum carbides (Mo 2 C) hold great promise as a cost‐effective catalyst platform. However, the realization of high‐performance Mo 2 C catalysts is still limited because controlling their particle size and catalytic activity is challenging with current synthesis methods. Here, the synthesis of ultrafine β‐Mo 2 C nanoparticles with narrow size distribution (2.5 ± 0.7 nm) and high mass loading (up to 27.5 wt%) on graphene substrate using a giant Mo‐based polyoxomolybdate cluster, Mo 132 ((NH 4 ) 42 [Mo 132 O 372 (CH 3 COO) 30 (H 2 O) 72 ]·10CH 3 COONH 4 ·300H 2 O) is demonstrated. Moreover, a nitrogen‐containing polymeric binder (polyethyleneimine) is used to create MoN bonds between Mo 2 C nanoparticles and nitrogen‐doped graphene layers, which significantly enhance the catalytic activity of Mo 2 C for the hydrogen evolution reaction, as is revealed by X‐ray photoelectron spectroscopy and density functional theory calculations. The optimal Mo 2 C catalyst shows a large exchange current density of 1.19 mA cm −2 , a high turnover frequency of 0.70 s −1 as well as excellent durability. The demonstrated new strategy opens up the possibility of developing practical platinum substitutes based on Mo 2 C for various catalytic applications.
Effect of Co-MCM-41 conversion to cobalt silicate for catalytic growth of single wall carbon nanotubes
Publisher: American Chemical Society (ACS)
Date: 12-2004
DOI: 10.1021/JP0466385
Carbon science perspective in 2022: Current research and future challenges
Publisher: Elsevier BV
Date: 08-2022
Narrow-chirality distributed single-walled carbon nanotube synthesis by remote plasma enhanced ethanol deposition on cobalt incorporated MCM-41 catalyst
Publisher: Elsevier BV
Date: 2014
Dual‐Template Pore Engineering of Whey Powder‐Derived Carbon as an Efficient Oxygen Reduction Reaction Electrocatalyst for Primary Zinc‐Air Battery
Publisher: Wiley
Date: 14-05-2020
Amorphous Bimetallic Oxide–Graphene Hybrids as Bifunctional Oxygen Electrocatalysts for Rechargeable Zn–Air Batteries
Publisher: Wiley
Date: 14-08-2017
Abstract: Metal oxides of earth-abundant elements are promising electrocatalysts to overcome the sluggish oxygen evolution and oxygen reduction reaction (OER/ORR) in many electrochemical energy-conversion devices. However, it is difficult to control their catalytic activity precisely. Here, a general three-stage synthesis strategy is described to produce a family of hybrid materials comprising amorphous bimetallic oxide nanoparticles anchored on N-doped reduced graphene oxide with simultaneous control of nanoparticle elemental composition, size, and crystallinity. Amorphous Fe
Recognition of carbon nanotube chirality by phage display
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C1RA00581B
Graphene oxide as effective selective barriers on a hollow fiber membrane for water treatment process
Publisher: Elsevier BV
Date: 2015
Ethanol-assisted graphene oxide-based thin film formation at pentane-water interface
Publisher: American Chemical Society (ACS)
Date: 29-06-2011
DOI: 10.1021/LA201230K
Abstract: Graphene oxide (GO) can be viewed as an hiphilic soft material, which form thin films at organic solvent-water interfaces. However, organic solvent evaporation provides little driving force, which results in slow GO transfer in aqueous phase, thus dawdling GO film formation processes for various potential applications. We present an ethanol-assisted self-assembly method for the quick formation of GO or GO-based composite thin films with tunable composition, transmittance, and surface resistivity at pentane-water interface. The thickness of pure GO and reduced GO (rGO) films ranging from ~1 nm to more than 10 nm can be controlled by the concentration of GO in bulk solution. The transmittance of rGO films can be tuned from 72% to 97% at 550 nm while the surface resistivity changes from 8.3 to 464.6 kΩ sq(-1). Ethanol is essential for achieving quick formation of GO thin films. When ethanol is injected into GO aqueous dispersion, it serves as a nonsolvent, compromising the stability of GO and providing driving force to allow GO sheets aggregate at the water-pentane interface. On the other hand, neither the evaporation of pentane nor the mixing between ethanol and water provides sufficient driving forces to allow noteworthy amount of GO sheets to migrate from the bulk aqueous phase to the interface. This method can also be extended to prepare GO-based composites thin films with tunable composition, such as GO/single walled carbon nanotube (SWCNT) composite thin films investigated in this work. Reduced GO/SWCNT composite films show much lower surface resistivity compared to pure rGO thin films. This ethanol-assisted self-assembly method opens opportunities to design and fabricate new functional GO-based hybrid materials for various potential applications.
Recent Progress of Carbon-Supported Single-Atom Catalysts for Energy Conversion and Storage
Publisher: Elsevier BV
Date: 11-2020
Mechanism of cobalt cluster size control in Co-MCM-41 during single-wall carbon nanotubes synthesis by CO disproportionation
Publisher: American Chemical Society (ACS)
Date: 14-09-2004
DOI: 10.1021/JP048067M
Cobalt Containing Zeolitic Imidazolate Framework Incorporated Electrospun Carbon Nanofibers As Free-Standing Film Sensor for Electrochemical Detection of Hydrogen Peroxide
Publisher: The Electrochemical Society
Date: 05-2019
DOI: 10.1149/MA2019-01/42/2006
Abstract: Hydrogen peroxide (H 2 O 2 ) is used as an oxidizer, bleaching agent and disinfectant in various fields such food processing, medicine and environment remediation. Further, H 2 O 2 is also produced as by-product of biochemical processes in human body. Thus, detecting the trace quantities of H 2 O 2 is of great significance. Among various detection techniques, electrochemical sensing offers relatively simple and fast detection where current signal generated from redox reaction of target analyte corresponds to its concentration. The performance of electrochemical sensors i.e. its sensitivity, lower limit and detection range depends on the type of materials utilized as electrocatalyst. Noble nanoparticles supported by nanocarbons are commonly used due to their higher sensitivity of detection, but their high cost and scarcity limit their widespread use [1]. Among low cost transition metals, cobalt nanoparticles derived from pyrolysis of metal organic framework (ZIF-67) are attractive materials for electrochemical H 2 O 2 sensing having superior properties such as high surface area, regular porous structure and conductive carbon matrix. Various conductive nanocarbon supports can be utilized to uniformly disperse ZIF-67 nanocrystals. Carbon nanofibers owing to low-cost scalable synthesis are ideal candidates for such conductive support. Their 1D structure offers highly conductive pathways for electron transport and they can form hierarchal porous structures with ZIFs where the micropores( nm) of ZIF contain active sites for reduction of H 2 O 2 and macropores ( nm) created by interconnection of carbon nanofibers minimizes mass transfer resistance of reactants and products to and from active sites. In this work, cobalt-carbon nanocomposites are synthesized by electrospinning of polymer precursor polyacrylonitrile (PAN) solution in dimethylformamide (DMF) solvent in which 30% ZIF-67 was uniformly dispersed. Electrospun polymer film was stabilized in air at 250 o C and carbonized in argon (Ar) at 900 o C to yield cobalt nanoparticles incorporated nitrogen-doped carbon nanofiber (ZIF-67/N-CNF) film. Amperometric tests on glassy carbon electrode (GCE) show that incorporation of ZIF-67 can improve sensitivity of N-CNF upto 3 times to 300 μA/ mM. cm 2 for H 2 O 2 detection. Carbonization of polymer film under 5% H 2 /Ar atmosphere resulted in further improvement of sensitivity to 475 μA/mM.cm 2 . Morphological and chemical properties were characterized to understand structure-property relationships. This sensor also demonstrated good stability and selectivity and was applied to milk and fruit juice s les to show their potential for real applications. ZIF-67/N-CNF film can be used as free standing sensor for H 2 O 2 detection which minimize the complicated steps of ink preparation typically required for powder based electrocatalysts for testing sensing performance on GCE. Further, miniaturized screen-printed electrodes (SPE) modified by ZIF-67/N-CNF, were fabricated as H 2 O 2 sensor to demonstrate low-cost portable detection. Reference: Riaz, Muhammad Adil, et al. "Ultralow-Platinum-Loading Nanocarbon Hybrids for Highly Sensitive Hydrogen Peroxide Detection." Sensors and Actuators B: Chemical (2019), 283, 304-311. (0.1016/j.snb.2018.12.041)
Length-dependent performances of sodium deoxycholate-dispersed single-walled carbon nanotube thin-film transistors
Publisher: Springer Science and Business Media LLC
Date: 15-10-2013
DOI: 10.1557/JMR.2012.321
Monodispersed MCM-41 large particles by modified pseudomorphic transformation: Direct diamine functionalization and application in protein bioseparation
Publisher: Elsevier BV
Date: 06-2009
Core-shell structured graphene aerogels with multifunctional mechanical, thermal and electromechanical properties
Publisher: Elsevier BV
Date: 06-2020
X-ray absorption spectroscopic investigation of partially reduced cobalt species in Co-MCM-41 catalysts during synthesis of single-wall carbon nanotubes
Publisher: American Chemical Society (ACS)
Date: 09-08-2005
DOI: 10.1021/JP052243P
Abstract: Chemometric tools were employed to analyze the in-situ dynamic X-ray absorption spectroscopy data to probe the state of Co-MCM-41 catalysts during reduction in pure hydrogen and under single-wall carbon nanotube synthesis reaction conditions. The use of the progressive correlation analysis established the sequence in which changes in the spectral features near the Co K edge occurred, and the evolving factor analysis provided evidence for the formation of an intermediate Co(1+) ionic species during reduction of the Co-MCM-41 catalyst in pure hydrogen up to 720 degrees C. This intermediate species preserves the tetrahedral environment in the silica framework and is resistant to complete reduction to the metal in H(2). While the Co(2+) species is resistant to reduction in pure CO, the intermediate Co(1+) species is more reactive in CO most likely forming cobalt carbonyl-like compounds with high mobility in the MCM-41. These mobile species are the precursors of the metallic clusters growing carbon nanotubes. Controlling the rates of each step of this two-stage reduction process is key to controlling the size of the metallic Co clusters formed in Co-MCM-41 catalysts.
Make it stereoscopic: interfacial design for full-temperature adaptive flexible zinc–air batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1EE01244D
Abstract: A flexible zinc–air battery fabricated from a stereoscopic air-cathode and a rationalized polyelectrolyte affords excellent electrochemical performances with flexibility in a broad temperature range of −30 to 80 °C.
Nanoparticle-supported consecutive reactions catalyzed by alkyl hydroperoxide reductase
Publisher: Elsevier BV
Date: 04-2012
Carbon/iron co-product from clean hydrogen production as a tri-functional adsorbent and catalyst for efficient wastewater treatment
Publisher: Elsevier BV
Date: 03-2024
Hierarchically porous carbon nanofibers embedded with cobalt nanoparticles for efficient H2O2 detection on multiple sensor platforms
Publisher: Elsevier BV
Date: 09-2020
Recent advances in nanomaterial-modified polyamide thin-film composite membranes for forward osmosis processes
Publisher: Elsevier BV
Date: 08-2019
Degradation: A critical challenge for M–N–C electrocatalysts
Publisher: Elsevier BV
Date: 12-2021
Effect of different catalyst supports on the (n,m) selective growth of single-walled carbon nanotube from Co-Mo catalyst
Publisher: Springer Science and Business Media LLC
Date: 06-2009
Acetone-induced graphene oxide film formation at the water-air interface
Publisher: Wiley
Date: 30-11-2013
Abstract: Graphene oxide (GO) is an hiphilic soft material, which can accumulate at the water-air interface. However, GO sheets diffuse slowly in the aqueous phase because of their large size. It is still challenging to form high quality GO films in a controllable and simple way. In this study, we showed that GO sheets can quickly migrate to the water-air interface and form thin films when a suitable amount of acetone is directly mixed with a GO aqueous dispersion. The film formation rate and surface coverage of GO sheets depend on the volume of acetone added, GO dispersion concentration, and formation time. Among several organic solvents, acetone has its advantage for GO film formation owing to its three properties: a nonsolvent to GO aqueous dispersions, miscible with a GO aqueous dispersion, and fast evaporation. Furthermore, we have found that the film formation also is governed by the size of GO sheets and their oxygen content. Although smaller GO sheets could migrate to the water-air interface faster, the overlapping of small GO sheets and the increase in contact resistance is not desirable. A higher oxygen content in GO sheets could also result in smaller GO sheets. Multilayer GO films can be obtained through layer-by-layer dip-coating. These findings open opportunities in developing simple scalable GO film fabrication processes.
Atomic carbon adsorption on Ni nanoclusters: a DFT study
Publisher: Springer Science and Business Media LLC
Date: 09-03-2010
Axial chlorine coordinated iron-nitrogen-carbon single-atom catalysts for efficient electrochemical CO2 reduction
Publisher: Elsevier BV
Date: 02-2022
Synthesis of uniform diameter single wall carbon nanotubes in Co-MCM-41: Effects of CO pressure and reaction time
Publisher: Elsevier BV
Date: 09-2004
Recent advances in catalysis—selected papers from APCAT 4 (Singapore, 6–8 December 2006)
Publisher: Elsevier BV
Date: 02-2008
Fabrication of novel functionalized multi-walled carbon nanotube immobilized hollow fiber membranes for enhanced performance in forward osmosis process
Publisher: Elsevier BV
Date: 11-2013
Use of a chondroitin sulfate isomer as an effective and removable dispersant of single-walled carbon nanotubes
Publisher: Wiley
Date: 16-08-2011
Abstract: Three isomers of chondroitin sulfate (CS), i.e., CS-A, CS-B, and CS-C, are investigated as nanotube dispersants and are found to have vastly different abilities to disperse single-walled carbon nanotubes (SWNTs) in water due to their different intramolecular interactions. Only CS-A and CS-C effectively disperse SWNTs into small bundles or in idual tubes while CS-B disperses SWNTs poorly. Computer simulation and circular dichrosim show that neat CS-A and CS-C have weak intramolecular hydrogen bonding and extended conformations in solution resulting in energetically more favorable interactions with nanotubes. CS-B has relatively strong intramolecular Coulombic interaction and more alpha-helical secondary structure in solution resulting in energetically less favorable interaction with the nanotubes. Atomic force microscopy images show helical wrappings of CS-A and CS-C around the SWNTs. Transmission electron microscopy corroborates the helical wrapping of CS-A. Different isomeric forms of a polymer can have vastly different dispersing power because of their different intramolecular interactions and conformations. The easy removability of CS-A from nanotubes is confirmed with X-ray photoelectron spectroscopy showing almost no detectable sulphur content after washing with water and by application of washed CS-A dispersed SWNTs in field-effect transistors.
High-energy-density aqueous sodium-ion batteries enabled by chromium hexacycnochromate anodes
Publisher: Elsevier BV
Date: 07-2021
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