ORCID Profile
0000-0002-7497-9499
Current Organisation
UNSW Sydney
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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.
Environmental Technologies | Environmental Engineering | Nanomaterials | Materials engineering | Manufacturing Engineering | Functional Materials | Energy Generation, Conversion and Storage Engineering | Condensed Matter Physics | Manufacturing Processes and Technologies (excl. Textiles) | Microtechnology | Materials Engineering | Photonics, Optoelectronics and Optical Communications | Electronic and Magnetic Properties of Condensed Matter; Superconductivity | Functional materials | Nanotechnology not elsewhere classified
Expanding Knowledge in Technology | Management of Greenhouse Gas Emissions from Electricity Generation | Industrial Machinery and Equipment | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Management of Greenhouse Gas Emissions from Manufacturing Activities |
Publisher: IOP Publishing
Date: 14-11-2004
Publisher: Wiley
Date: 09-2006
Publisher: Elsevier BV
Date: 05-2017
Publisher: Springer Science and Business Media LLC
Date: 12-12-2016
DOI: 10.1038/SREP37731
Abstract: Metal nanowires exhibit unusually high catalytic activity towards oxygen reduction reaction (ORR) due to their inherent electronic structures. However, controllable synthesis of stable nanowires still remains as a daunting challenge. Herein, we report the in situ synthesis of silver nanowires (AgNWs) over boron doped graphene sheets (BG) and demonstrated its efficient electrocatalytic activity towards ORR for the first time. The electrocatalytic ORR efficacy of BG-AgNW is studied using various voltammetric techniques. The BG wrapped AgNWs shows excellent ORR activity, with very high onset potential and current density and it followed four electron transfer mechanism with high methanol tolerance and stability towards ORR. The results are comparable to the commercially available 20% Pt/C in terms of performance.
Publisher: IOP Publishing
Date: 14-04-2010
DOI: 10.1088/0957-4484/21/18/185604
Abstract: There is considerable interest in using DNA nanowires or nanotubes in a wide variety of bioelectronic applications and microcircuitry. Various methods have been developed to construct DNA nanostructures. Here, we report a novel method to construct semiconducting DNA nanowires by applying a suitable DC bias to a gold plating solution containing double-stranded DNA. The self-assembled nanowires fabricated by this method contain attached gold nanoparticles. Further, we report that the dimensions of the nanowires can be easily manipulated by altering the applied DC bias. We also confirmed the semiconducting nature of the DNA nanowires by studying their resistance-temperature behavior from 25 to 65 degrees C in a microelectrode system. These studies describe a simple process by which gold-decorated, semiconducting DNA nanowires could be created and may lead to a breakthrough in the field of self-assembly of nanometer-scale circuits. The self-assembled structures do have some similarity with tube-like structures but in the present work we are using the term 'DNA nanowires' to define the structures.
Publisher: American Chemical Society (ACS)
Date: 14-05-2019
Publisher: Elsevier BV
Date: 2011
Publisher: Elsevier BV
Date: 11-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6CP07654H
Abstract: Defects are no longer deemed an adverse aspect of graphene.
Publisher: Elsevier BV
Date: 04-2005
Publisher: IOP Publishing
Date: 14-04-2003
Publisher: Wiley
Date: 17-03-2020
Publisher: Elsevier BV
Date: 11-2015
Publisher: Elsevier BV
Date: 08-2010
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7GC02523H
Abstract: Green approaches for producing high purity advanced materials have always been a challenging task.
Publisher: Elsevier BV
Date: 08-2022
Publisher: AIP Publishing
Date: 09-10-2006
DOI: 10.1063/1.2360245
Abstract: The influence of Ag particle size on ethanol sensing of SnO1.8:Ag films composed of size-selected nanoparticles with independently controlled size and concentration of Ag is reported in the present study. The study shows that Ag nanoparticles are acting as catalyst for chemical sensitization through a spillover effect. The catalyst particles are observed to be more active on decreasing their size, resulting into an improved sensor response. A response time of 2s for 1000ppm ethanol has been achieved. Detection of 100ppb ethanol in air has been demonstrated using this well-defined technique.
Publisher: Elsevier BV
Date: 10-2023
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2009
Publisher: American Scientific Publishers
Date: 06-2013
Abstract: We report a new chemical method for synthesis of graphene with good yield. Graphene obtained by this chemical route was subjected to electrochemical characterization using two different redox materials for their suitability in electrochemical biosensing applications. The synthesized graphene was used for the detection of neurotransmitters like dopamine and serotonin. The electrodes exhibited 20% +/- 5% (N = 5) decrease in their signal after forty five days storage in the laboratory atmosphere. High stability of chemically synthesized graphene as electrochemical biosensor is presented in this work.
Publisher: Elsevier BV
Date: 2003
Publisher: Elsevier BV
Date: 04-2021
Publisher: Springer Science and Business Media LLC
Date: 28-09-2022
DOI: 10.1038/S41467-022-33456-W
Abstract: The water transport along graphene-based nanochannels has gained significant interest. However, experimental access to the influence of defects and impurities on transport poses a critical knowledge gap. Here, we investigate the water transport of cation intercalated graphene oxide membranes. The cations act as water-attracting impurities on the channel walls. Via water transport experiments, we show that the slip length of the nanochannels decay exponentially with the hydrated diameter of the intercalated cations, confirming that water transport is governed by the interaction between water molecules and the impurities on the channel wall. The exponential decay of slip length approximates non-slip conditions. This offers experimental support for the use of the Hagen-Poiseuille equation in graphene-based nanochannels, which was previously only confirmed by simulations. Our study gives valuable feedback to theoretical predictions of the water transport along graphene-based channels with water-attracting impurities.
Publisher: Elsevier BV
Date: 2005
Publisher: Springer Science and Business Media LLC
Date: 06-10-2022
DOI: 10.1557/S43578-022-00758-0
Abstract: Graphene, an atomically thin two-dimensional (2D) material, exhibits outstanding electrical properties and thus has been employed in various electronic devices. However, the device performance strongly depends on the structural variations present in the graphitic lattice, such as crystal domains, grain boundaries, lattice imperfections, dopants, etc., which are nanoscopic in nature. Hence, understanding the correlation between the structure and the electrical properties in the nanoscale is essential. Atomic force microscopy (AFM) techniques provide the best way to picture such relationships, which is particularly in demand for future miniaturized devices. This review article highlights the characterization of the electrical properties of graphene-based materials via AFM-based techniques such as conductive AFM, scanning Kelvin probe microscopy, electrostatic force microscopy, and piezoresponse force microscopy that is certainly beneficial for a broad research community not only working on graphene-based materials but also in the fields of other 2D materials and scanning probe microscopy. Graphical abstract
Publisher: Springer Science and Business Media LLC
Date: 20-10-2010
DOI: 10.1038/PJ.2010.89
Publisher: American Chemical Society (ACS)
Date: 11-09-2013
DOI: 10.1021/JP406712S
Publisher: American Chemical Society (ACS)
Date: 26-10-2020
Publisher: American Chemical Society (ACS)
Date: 16-06-2022
DOI: 10.26434/CHEMRXIV-2022-B61SX
Abstract: The water transport along graphene-based nanochannels has gained significant interest. However, experimental access to the influence of defects and impurities on transport poses a critical knowledge gap. Here, we investigate the water transport of cation intercalated graphene oxide membranes. The cations act as water-attracting impurities on the channel walls. Via water transport experiments, we show that the slip length of the nanochannels decay exponentially with the hydrated diameter of the intercalated cations, confirming that water transport is governed by the interaction between water molecules and the impurities on the channel wall. The exponential decay of slip length approximates non-slip conditions. This offers experimental support for the use of the Hagen-Poiseuille equation in graphene-based nanochannels, which was previously only confirmed by simulations. Our study gives valuable feedback to theoretical predictions of the water transport along graphene-based channels with water-attracting impurities.
Publisher: Wiley
Date: 20-08-2019
Publisher: Elsevier BV
Date: 2004
Publisher: AIP Publishing
Date: 28-06-2010
DOI: 10.1063/1.3458698
Abstract: We report the direct electron transfer of cytochrome c (Cyt c) observed at graphene electrodes. Graphene nanosheets were chemically synthesized and immobilized on to a glassy carbon electrode. Cyclic voltammetry of Cyt c in phosphate buffered saline was performed at these electrodes. Results indicated a pair of reversible redox waves with a peak-to-peak separation value of 0.07 V in a diffusion controlled electrochemical process. Furthermore, the voltammetric response of these electrodes in Cyt c were found to be stable over time with negligible electrode fouling toward Cyt c.
Publisher: IOP Publishing
Date: 09-05-2008
DOI: 10.1088/0957-4484/19/24/245502
Abstract: The vapor-liquid-solid (VLS) growth procedure has been extended for the selective growth of silica nanowires on SiO(2) layer by using Au as a catalyst. The nanowires were grown in an open tube furnace at 1100 °C for 60 min using Ar as a carrier gas. The average diameter of these bottom-up nucleated wires was found to be 200 nm. Transmission electron microscopy analysis indicates the amorphous nature of these nanoscale wires and suggests an Si-silica heterostructure. The localized silica nanowires have been used as an immunoassay template in the detection of interleukin-10 which is a lung cancer biomarker. Such a nanostructured platform offered a tenfold enhancement in the optical response, aiding the recognition of IL-10 in comparison to a bare silica substrate. The role of nanowires in the immunoassay was verified through the quenching behavior in the photoluminescence (PL) spectra. Two orders of reduction in PL intensity have been observed after completion of the immunoassay with significant quenching after executing every step of the protocol. The potential of this site-specific growth of silica nanowires on SiO(2) as a multi-modal biosensing platform has been discussed.
Publisher: IEEE
Date: 11-2010
Publisher: Elsevier BV
Date: 05-2017
Publisher: American Association for the Advancement of Science (AAAS)
Date: 13-02-2014
Abstract: Graphene-based materials can have well-defined nanometer pores and can exhibit low frictional water flow inside them, making their properties of interest for filtration and separation. We investigate permeation through micrometer-thick laminates prepared by means of vacuum filtration of graphene oxide suspensions. The laminates are vacuum-tight in the dry state but, if immersed in water, act as molecular sieves, blocking all solutes with hydrated radii larger than 4.5 angstroms. Smaller ions permeate through the membranes at rates thousands of times faster than what is expected for simple diffusion. We believe that this behavior is caused by a network of nanocapillaries that open up in the hydrated state and accept only species that fit in. The anomalously fast permeation is attributed to a capillary-like high pressure acting on ions inside graphene capillaries.
Publisher: American Scientific Publishers
Date: 06-2007
DOI: 10.1166/JNN.2007.743
Abstract: In2O3 nanoparticle layers having an average size of 8, 11, 15, 21, and 29 nm have been deposited using a two-step method consisting of chemical capping and dip coating techniques. The gas sensing properties in terms of sensor response and response time of the nanoparticle layers towards ethanol have been studied as a function of ethanol concentration and operating temperature. It has been observed that the sensor response increases and the response time decreases with decreasing size in the size range of 5-15 nm. The increase in sensor response at smaller nanoparticle size has been explained in terms of the increase in surface area and particle size becoming comparable to the electron Debye length.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2CC01488B
Abstract: Here we report on the facile formation of asymmetric heterojunctions between laterally size different 2D flakes, which leads to a prominent gradient in charge distribution at the nanocontact interface and triggers ionic diode-like transport behaviour with a rectification ratio of 110.
Publisher: American Chemical Society (ACS)
Date: 15-03-2010
DOI: 10.1021/JP100343D
Publisher: Elsevier BV
Date: 04-2022
Publisher: Springer Science and Business Media LLC
Date: 10-08-2022
DOI: 10.1557/S43578-022-00647-6
Abstract: 2-Dimensional materials-based membranes have been considered as promising candidates for water purification. Here, we report that graphene oxide (GO) membrane can reject aquatic humic acid (HA) up to 94.2% in a 2-bar pressurized filtration process. In-depth analysis indicated that the filtration performances such as water flux and rejection rate depend on the thickness and physical structure of the membranes. The experimental study reveals that the GO membrane with a mass loading of 0.58 mg/cm 2 , which is approximately equivalent to 3 μm thickness, is required to reach the rejection rate of HA at 94% using 2 bar pressurized filtration method. We further confirmed the membranes’ integrity by over 98% rejection of methylene blue (MB). For practicality, we tested our membrane in tubular form by coating GO on PVDF hollow fibres, which presented similar rejection performances using vacuum filtration method while maintaining the water flux around 100 L m −2 h −1 bar −1 . Graphical abstract
Publisher: American Chemical Society (ACS)
Date: 02-12-2022
DOI: 10.26434/CHEMRXIV-2022-1Q6GB
Abstract: Materials in 2-dimensional (2D) form often show remarkable properties and unexplored scientific phenomena compared to their bulk form. Layered, van der Waals (vdW) materials have an obvious 2D structure, whereas non-vdW materials have no preference to obtain 2D form. This severely limits the number of currently available 2D non-vDW materials. Here, we introduce a straightforward electrochemical method utilizing the angstrom-confinement of laminar reduced graphene oxide (rGO) nanochannels to obtain 2D transition metal oxides (2D-TMO), a class of non-vdW materials. During synthesis the angstrom-confinement provides a thickness limitation, forcing a sub-unit cell growth of 2D-TMO with oxygen and metal vacancies. The resulting flexible sandwich structure of rGO sheets inserted by a porous polycrystalline network of 2D-TMO is created in centimetre scale. Our accessible method for obtaining 2D-TMO holds high promise to yield exciting properties for fundamental science and applications.
Publisher: The Electrochemical Society
Date: 2006
DOI: 10.1149/1.2257384
Publisher: American Chemical Society (ACS)
Date: 22-06-2021
Publisher: American Chemical Society (ACS)
Date: 09-05-2022
Publisher: Springer Science and Business Media LLC
Date: 23-05-2006
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3EE00770G
Abstract: Illustration of protein-based MEG generating electricity by absorbing water from moisture.
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 12-2019
Publisher: AIP Publishing
Date: 04-07-2011
DOI: 10.1063/1.3608140
Abstract: Scanning Kelvin probe microscopy has been used to understand the modification of work function of TiO2 with swift heavy ion irradiation. The observed increase in contact potential difference (CPD) indicates a shift in Fermi level towards the valence band, which is due to the development of defects during the bombardment of high energy heavy ions. The change in CPD values on ion irradiation is attributed to electronic excitation induced defect concentration and surface roughness.
Publisher: Elsevier BV
Date: 08-2018
Publisher: Springer Science and Business Media LLC
Date: 18-05-2020
DOI: 10.1038/S41699-020-0148-9
Abstract: Despite the improvement of the quality of CVD grown single-layer graphene on copper substrates, transferring the two-dimensional layer without introducing any unintentional defects still poses a challenge. While many approaches focus on optimizing the transfer itself or on necessary post-transfer cleaning steps, we have focused on developing a pre-treatment of the monolayer graphene on copper to improve the quality and reproducibility of the transfer process. By pressing an ethylene-vinyl acetate copolymer foil onto the monolayer graphene on copper using a commercially available vacuum bag sealer graphene is stabilized by the attachment of functional carbon groups. As a result, we are able to transfer graphene without the need of any supporting layer in an all-H 2 O wet-chemical transfer step. Despite the general belief that the crumbling of graphene without a support layer in a H 2 O environment is caused due to differences in surface energy, we will show that this assumption is false and that this behavior is caused rather by the polar interactions between graphene and water. Suppressing these interactions protects graphene from ripping and results in extremely clean, highly crystalline graphene with a coverage close to 100%.
Publisher: American Chemical Society (ACS)
Date: 05-08-2021
Abstract: Protection against pathogens using personal protective equipment is essential yet challenging in healthcare settings. Concerns over emerging biothreats and outbreaks of infectious diseases underscore the need for antimicrobial and biocompatible protective clothing to protect patients and staff. Herein, we report the antimicrobial efficacy and cytotoxicity of cotton/silk fabrics containing embedded reduced graphene oxide (RGO) and Ag/Cu nanoparticles (NPs), prepared using a 3-glycidyloxypropyl trimethoxy silane coupling agent followed by chemical reduction and vacuum heat treatment. Embedding NPs on top of the RGO layer substantially increased the antimicrobial activity. All RGO-Ag NPs or RGO-Cu NPs embedded in cotton or silk fabrics reduced the viability of approximately 99% of the Gram-negative bacteria
Publisher: Elsevier BV
Date: 08-2006
Publisher: MDPI AG
Date: 14-12-2020
DOI: 10.3390/NANO10122511
Abstract: Due to the excellent chemical inertness, graphene can be used as an anti-corrosive coating to protect metal surfaces. Here, we report the growth of graphene by using a chemical vapour deposition (CVD) process with ethanol as a carbon source. Surface and structural characterisations of CVD grown films suggest the formation of double-layer graphene. Electrochemical impedance spectroscopy has been used to study the anticorrosion behaviour of the CVD grown graphene layer. The observed corrosion rate of 8.08 × 10−14 m/s for graphene-coated copper is 24 times lower than the value for pure copper which shows the potential of graphene as the anticorrosive layer. Furthermore, we observed no significant changes in anticorrosive behaviour of the graphene coated copper s les stored in ambient environment for more than one year.
Publisher: Elsevier BV
Date: 08-2017
Publisher: American Scientific Publishers
Date: 02-2009
DOI: 10.1166/SL.2009.1006
Publisher: Elsevier BV
Date: 09-2019
Publisher: IOP Publishing
Date: 28-05-2003
Publisher: Informa UK Limited
Date: 13-07-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NR08419J
Abstract: The comprehensive understanding of water transport in GO membranes is of great interest.
Publisher: American Scientific Publishers
Date: 12-2007
DOI: 10.1166/JNN.2007.888
Abstract: Pd nanoparticles of well-defined shapes with face centered cubic structure were grown electrochemically on silicon substrates with high degree of reproducibility. As direct application of these electrochemically grown Pd nanostructures they have been used as catalyst for the growth of multi wall carbon nanotube (MWCNT). It is observed that the MWCNTs are filled with a Pd based material during growth by microwave plasma enhanced chemical vapor deposition (MPECVD) technique. High-resolution transmission electron microscopy, used to study the material inside MWCNT suggests the formation of PdH 0 649 or Pd 2 Si during the growth of carbon nanotube. Raman spectroscopy has been used to study the structure of the MPECVD grown carbon nanotubes.
Publisher: Hindawi Limited
Date: 2007
DOI: 10.1155/2007/28031
Abstract: In 2 O 3 and In 2 O 3 :Ag nanoparticle layers have been deposited using a two-step method consisting of chemical capping and dip coating techniques. The result of optical absorption analysis of In 2 O 3 :Ag s les shows the presence of Ag 2 O and Ag in air-annealed and vacuum-annealed s les, respectively. These results have been correlated with the gas sensing properties of these layers towards ethanol and support the proposed mechanism that increase in sensor response on Ag addition is due to the conversion of Ag 2 O to Ag in the presence of ethanol.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8SC00545A
Abstract: The laminated structure of graphene oxide (GO) confers unique interactions with water molecules which may be utilised in a range of applications that require materials with tuneable hygroscopic properties.
Publisher: American Chemical Society (ACS)
Date: 13-08-2008
DOI: 10.1021/JP8050752
Publisher: Elsevier BV
Date: 2004
Publisher: American Chemical Society (ACS)
Date: 06-07-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8NA00110C
Abstract: Silver nanowire (Ag NW) based composites have shown a great potential not just in transparent electrodes but in erse functional applications.
Publisher: Wiley
Date: 17-06-2023
Abstract: Bottom‐up electrochemical synthesis of atomically thin materials is desirable yet challenging, especially for non‐van der Waals (non‐vdW) materials. Thicknesses below a few nanometers have not been reported yet, posing the question how thin can non‐vdW materials be electrochemically synthesized. This is important as materials with (sub‐)unit‐cell thickness often show remarkably different properties compared to their bulk form or thin films of several nanometers thickness. Here, a straightforward electrochemical method utilizing the angstrom‐confinement of laminar reduced graphene oxide (rGO) nanochannels is introduced to obtain a centimeter‐scale network of atomically thin ( .3 Å) 2D‐transition metal oxides (2D‐TMO). The angstrom‐confinement provides a thickness limitation, forcing sub‐unit‐cell growth of 2D‐TMO with oxygen and metal vacancies. It is showcased that Cr 2 O 3 , a material without significant catalytic activity for the oxygen evolution reaction (OER) in bulk form, can be activated as a high‐performing catalyst if synthesized in the 2D sub‐unit‐cell form. This method displays the high activity of sub‐unit‐cell form while retaining the stability of bulk form, promising to yield unexplored fundamental science and applications. It is shown that while retaining the advantages of bottom‐up electrochemical synthesis, like simplicity, high yield, and mild conditions, the thickness of TMO can be limited to sub‐unit‐cell dimensions.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8RA03156H
Abstract: This review article outlines a comparison of GO and r-GO membranes for separation and purification applications.
Publisher: Elsevier BV
Date: 08-2017
Publisher: Hindawi Limited
Date: 2007
DOI: 10.1155/2007/67072
Abstract: Mixed nanoparticle films of SnO 1.8 : Ag prepared by the gas phase condensation method using an aerosol route have been used for the detection of CO and CH 4 . Particle size as estimated by transmission electron microscopy is 20 nm for both SnO 1.8 and Ag nanoparticles. The gas-sensing behavior of the films for these gases has been studied in detail as a function of Ag concentration in the films. A study has been made in order to distinguish the size effect and specific surface area effect in the ethanol gas-sensing behavior of SnO 1.8 : Ag mixed nanoparticle films. This distinction, which has not been possible using the traditional methods of the sensor fabrication, gives evidence of the dominance of size effect of the metal dopant over the surface area effect in the gas sensing of the films. The sensors show also an increased sensor signal with increase of Ag concentration in the films for CO and CH 4 . It is observed from the comparative study of the sensing behavior of SnO 1.8 : Ag films for CO and CH 4 that the sensors are more sensitive towards CO as compared to CH 4 . The mixed nanoparticle films were also used for the detection of CO at 100 ppm level.
Publisher: Springer Science and Business Media LLC
Date: 07-2009
DOI: 10.1007/S11671-009-9379-6
Abstract: We report the application of palladium nanoparticles and thin films for hydrogen sensor. Electrochemically grown palladium particles with spherical shapes deposited on Si substrate and sputter deposited Pd thin films were used to detect hydrogen at room temperature. Grain size dependence of H 2 sensing behavior has been discussed for both types of Pd films. The electrochemically grown Pd nanoparticles were observed to show better hydrogen sensing response than the sputtered palladium thin films. The demonstration of size dependent room temperature H 2 sensing paves the ways to fabricate the room temperature metallic and metal–metal oxide semiconductor sensor by tuning the size of metal catalyst in mixed systems. H 2 sensing by the Pd nanostructures is attributed to the chemical and electronic sensitization mechanisms.
Publisher: Springer Science and Business Media LLC
Date: 16-11-2011
Publisher: American Physical Society (APS)
Date: 29-09-2004
Publisher: Elsevier BV
Date: 04-03-2010
Publisher: MDPI AG
Date: 25-06-2021
DOI: 10.3390/NANO11071676
Abstract: Graphene oxide (GO)-based materials have demonstrated promising potential for adsorption and purification applications. Due to its hiphilic nature, GO offers the possibility of removing various kinds of contaminants, including heavy metal ions and organic pollutants from aqueous environments. Here, we present size-selective ion adsorption in GO-based laminates by directly measuring the weight uptake of slats. Adsorption studies were conducted in graphene oxide purchased from Nisina Materials Japan prepared using a controlled method. We tuned the interlayer spacing of GO membranes via cationic control solutions using intercalation of very small salts ions (i.e., K+, Na+, Cl−) very precisely to facilitate the adsorption of larger ions such as [Fe(CN)6]4− and [Fe(CN)6]3−. This study demonstrates that if the opening of nanocapillaries within the laminates is bigger than the hydrated diameter of ions, the adsorption occurs within the membranes while for smaller opening, with no ion entrance the sorption occurs on the surface of the membranes.
Publisher: Elsevier BV
Date: 11-2021
Publisher: IOP Publishing
Date: 10-11-2004
Publisher: American Chemical Society (ACS)
Date: 24-03-2021
Publisher: Elsevier BV
Date: 12-2020
Publisher: IOP Publishing
Date: 03-08-2020
Publisher: The Royal Society of Chemistry
Date: 27-09-2019
DOI: 10.1039/9781788013017-00163
Abstract: This chapter demonstrates the potential of graphene-based membranes for purification and separation applications. The synthesis, fabrication, characterization, and application of this promising membrane material are discussed in detail. To understand the concepts of molecular transport at the sub-nanometer level, ex les of molecular dynamics simulation are discussed. Recent advances on graphene-based membrane applications are discussed extensively, and the future scope of this extraordinary membrane material is discussed.
Publisher: Elsevier BV
Date: 08-2007
Publisher: American Chemical Society (ACS)
Date: 28-01-2019
DOI: 10.26434/CHEMRXIV.7637030.V1
Abstract: Graphene has attracted substantial interest as potential carbon electrode material for energy storage applications. Yet, the utility of this material for these applications is governed by its stability and microstructure (i.e., surface area and porosity). Graphene can be prepared in controlled orientation by changing the surface chemistry of GO flakes in suspensions via reduction which causes the graphene to coagulate and self-assemble in specific patterns. Tuning the structure and porosity of oriented graphene is possible by varying the synthesis conditions. Herein, we report the growth of oriented graphene from a relatively small flake size GO suspension. The prepared electrode material demonstrated an excellent electrochemical performance with a supercapacitance value of 195 F g-1 at 1 mV s-1 and low real impedance with good stability and integrity after 4000 cycles of continuous charge-discharge in 1 M KOH electrolyte. This excellent performance is due to the unique architecture of the oriented graphene which comprises micro-slits and meso-channels among the sheets. The meso-channels were suggested to allow rapid diffusion of charge carriers and ions while the micro-slits increase more surface area for electrochemical interactions per unit volume. The observations reported herein create a new understanding of the structure-stability-performance trade-off in oriented graphene and layout the foundation for further investigations on their sustainable utilization in energy storage applications.
Publisher: Elsevier BV
Date: 09-2020
Publisher: IOP Publishing
Date: 18-12-2009
Publisher: Wiley
Date: 26-08-2020
Publisher: AIP Publishing
Date: 20-02-2006
DOI: 10.1063/1.2179111
Abstract: A model is proposed to explain the observed decrease of average grain size with an increase of Fe concentration in the Pb1−xFexS (0.25⩽x⩽0.75) and Co concentration in the Pb1−xCoxS (0.15⩽x⩽0.35) nanoparticle films. Higher solubility product for MS (M=Fe and Co) as compared to PbS is observed to be responsible for the decrease of grain size with an increase of M concentration in the films. The model was found true for Pb1−xCdxS (0.45⩽x⩽0.85) and Pb1−xMnxS (0.03⩽x⩽0.37) films.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1CP04831G
Abstract: Covalent functionalization of the surface is more crucial in 2D materials than in conventional bulk materials because of their atomic thinness, large surface-to-volume ratio, and uniform surface chemical potential. Because 2D materials are composed of two surfaces with no dangling bond, covalent functionalization enables us to improve or precisely modify the electrical, mechanical, and chemical properties. In this review, we summarize the covalent functionalization methods and related changes in properties. First, we discuss possible sites for functionalization. Consequently, functionalization techniques are introduced, followed by the direct synthesis of functionalized 2D materials and characterization methods of functionalized 2D materials. Finally, we suggest how the issues may be solved to enlarge the research area and understanding of the chemistry of 2D materials. This review will help in understanding the functionalization of 2D materials.
Publisher: American Chemical Society (ACS)
Date: 19-07-2021
Publisher: American Chemical Society (ACS)
Date: 18-08-2009
DOI: 10.1021/JP906458B
Publisher: Wiley
Date: 12-08-2011
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2CP04082D
Abstract: Graphene oxide consists of erse surface chemistry which allows tethering GO with additional functionalities and tuning its intrinsic properties. This review summarizes recently advanced methods to covalently modify GO for specific applications.
Publisher: American Chemical Society (ACS)
Date: 10-06-2022
DOI: 10.1021/ACS.NANOLETT.2C01615
Abstract: Angstrom-confined solvents in 2D laminates can travel through interlayer spacings, through gaps between adjacent sheets, and via in-plane pores. Among these, experimental access to investigate the mass transport through in-plane pores is lacking. Our experiments allow an understanding of this mass transport via the controlled variation of oxygen functionalities, size and density of in-plane pores in graphene oxide membranes. Contrary to expectations, our transport experiments show that higher in-plane pore densities may not necessarily lead to higher water permeability. We observed that membranes with a high in-plane pore density but a low amount of oxygen functionalities exhibit a complete blockage of water. However, when water-ethanol mixtures with a weaker hydrogen network are used, these membranes show an enhanced permeation. Our combined experimental and computational results suggest that the transport mechanism is governed by the attraction of the solvents toward the pores with functional groups and hindered by the strong hydrogen network of water formed under angstrom confinement.
Publisher: Elsevier BV
Date: 06-2004
Publisher: American Chemical Society (ACS)
Date: 17-01-2008
DOI: 10.1021/JP077512L
Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier BV
Date: 06-2004
Publisher: Elsevier BV
Date: 09-2020
Publisher: AIP Publishing
Date: 2016
DOI: 10.1063/1.4941062
Abstract: Study on hydrogen generation has been of huge interest due to increasing demand for new energy sources. Photoelectrochemical reaction by catalysts was proposed as a promising technique for hydrogen generation. Herein, we report the hydrogen generation via photoelectrochecmial reaction using films of exfoliated 2-dimensional (2D) MoS2, which acts as an efficient photocatalyst. The film of chemically exfoliated MoS2 layers was employed for water splitting, leading to hydrogen generation. The amount of hydrogen was qualitatively monitored by observing overpressure of a water container. The high photo-current generated by MoS2 film resulted in hydrogen evolution. Our work shows that 2D MoS2 is one of the promising candidates as a photocatalyst for light-induced hydrogen generation. High photoelectrocatalytic efficiency of the 2D MoS2 shows a new way toward hydrogen generation, which is one of the renewable energy sources. The efficient photoelectrocatalytic property of the 2D MoS2 is possibly due to availability of catalytically active edge sites together with minimal stacking that favors the electron transfer.
Publisher: Elsevier BV
Date: 15-12-2004
Publisher: IOP Publishing
Date: 24-12-2018
Start Date: 06-2020
End Date: 09-2023
Amount: $550,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 01-2023
End Date: 2026
Amount: $486,640.00
Funder: Australian Research Council
View Funded ActivityStart Date: 10-2021
End Date: 09-2023
Amount: $489,250.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2023
End Date: 12-2027
Amount: $5,000,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2018
End Date: 12-2022
Amount: $267,804.00
Funder: Australian Research Council
View Funded ActivityStart Date: 01-2021
End Date: 01-2026
Amount: $3,317,500.00
Funder: Australian Research Council
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