ORCID Profile
0000-0003-2435-5220
Current Organisation
Deakin University
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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)
Nanotechnology | Nanomaterials | Functional Materials | Nanoscale Characterisation | Materials Engineering | Nanofabrication, Growth and Self Assembly | Materials Engineering not elsewhere classified | Nanomaterials | Photonics, Optoelectronics and Optical Communications | Nanotechnology | Condensed Matter Characterisation Technique Development | Functional materials | Condensed Matter Physics not elsewhere classified |
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Technology | Expanding Knowledge in Engineering | Expanding Knowledge in the Chemical Sciences | Manufacturing not elsewhere classified |
Related Links
Publications
High-quality boron nitride nanoribbons: Unzipping during nanotube synthesis
Publisher: Wiley
Date: 04-03-2013
Electron beam directed etching of hexagonal boron nitride
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6NR04959A
Abstract: High resolution directed electron beam etching of hBN using water as the precursor gas.
Electric contributions to magnetic force microscopy response from graphene and MoS2 nanosheets
Publisher: AIP Publishing
Date: 03-12-2014
DOI: 10.1063/1.4903040
Abstract: Magnetic force microscopy (MFM) signals have recently been detected from whole pieces of mechanically exfoliated graphene and molybdenum disulfide (MoS2) nanosheets, and magnetism of the two nanomaterials was claimed based on these observations. However, non-magnetic interactions or artefacts are commonly associated with MFM signals, which make the interpretation of MFM signals not straightforward. A systematic investigation has been done to examine possible sources of the MFM signals from graphene and MoS2 nanosheets and whether the MFM signals can be correlated with magnetism. It is found that the MFM signals have significant non-magnetic contributions due to capacitive and electrostatic interactions between the nanosheets and conductive cantilever tip, as demonstrated by electric force microscopy and scanning Kevin probe microscopy analyses. In addition, the MFM signals of graphene and MoS2 nanosheets are not responsive to reversed magnetic field of the magnetic cantilever tip. Therefore, the observed MFM response is mainly from electric artefacts and not compelling enough to correlate with magnetism of graphene and MoS2 nanosheets.
Atomically Thin Boron Nitride: Unique Properties and Applications
Publisher: Wiley
Date: 16-02-2016
Outstanding Thermal Conductivity of Single Atomic Layer Isotope-Modified Boron Nitride
Publisher: American Physical Society (APS)
Date: 21-08-2020
Atomically Thin Boron Nitride as an Ideal Spacer for Metal-Enhanced Fluorescence
Publisher: American Chemical Society (ACS)
Date: 02-10-2019
Abstract: Metal-enhanced fluorescence (MEF) considerably enhances the luminescence for various applications, but its performance largely depends on the dielectric spacer between the fluorophore and plasmonic system. It is still challenging to produce a defect-free spacer having an optimized thickness with a sub-nanometer accuracy that enables reusability without affecting the enhancement. In this study, we demonstrate the use of atomically thin hexagonal boron nitride (BN) as an ideal MEF spacer owing to its multifold advantages over the traditional dielectric thin films. With rhodamine 6G as a representative fluorophore, it largely improves the enhancement factor (up to ∼95 ± 5), sensitivity (10
Boron nitride nanosheets as improved and reusable substrates for gold nanoparticles enabled surface enhanced Raman spectroscopy
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CP00532A
Abstract: Boron nitride nanosheets covered by gold nanoparticles are controllably fabricated for highly-sensitive and reusable substrates for surface enhanced Raman spectroscopy.
Molecule-Induced Conformational Change in Boron Nitride Nanosheets with Enhanced Surface Adsorption
Publisher: Wiley
Date: 29-08-2016
Abstract: Surface interaction is extremely important to both fundamental research and practical application. Physisorption can induce shape and structural distortion (i.e., conformational changes) in macromolecular and biomolecular adsorbates, but such phenomena have rarely been observed on adsorbents. Here, it is demonstrated theoretically and experimentally that atomically thin boron nitride (BN) nanosheets as an adsorbent experience conformational changes upon surface adsorption of molecules, increasing adsorption energy and efficiency. The study not only provides new perspectives on the strong adsorption capability of BN nanosheets and many other two‐dimensional (2D) nanomaterials but also opens up possibilities for many novel applications. For ex le, it is demonstrated that BN nanosheets with the same surface area as bulk hexagonal BN particles are more effective in purification and sensing.
Boron nitride nanotubes reinforced aluminum composites prepared by spark plasma sintering: Microstructure, mechanical properties and deformation behavior
Publisher: Elsevier BV
Date: 07-2013
Controlled surface modification of boron nitride nanotubes
Publisher: IOP Publishing
Date: 20-04-2011
Synthesis of boron nitride nanotubes, bamboos and nanowires
Publisher: Elsevier BV
Date: 05-2008
Surface wetting processing on BNNT films by selective plasma modes
Publisher: Springer Science and Business Media LLC
Date: 07-06-2013
Layer-Dependent Mechanical Properties and Enhanced Plasticity in the Van der Waals Chromium Trihalide Magnets
Publisher: American Chemical Society (ACS)
Date: 09-04-2021
STEM electron tomography in the Scanning Electron Microscope
Publisher: IOP Publishing
Date: 12-10-2015
Superhydrophobic and Superoleophilic Boron Nitride Nanotube-Coated Stainless Steel Meshes for Oil and Water Separation
Publisher: Wiley
Date: 08-11-2014
Mechanically activated catalyst mixing for high-yield boron nitride nanotube growth
Publisher: Springer Science and Business Media LLC
Date: 24-07-2012
Superhydrophobic Properties of Nonaligned Boron Nitride Nanotube Films
Publisher: American Chemical Society (ACS)
Date: 10-12-2010
DOI: 10.1021/LA903604W
Toward design of synergistically active carbon-based catalysts for electrocatalytic hydrogen evolution
Publisher: American Chemical Society (ACS)
Date: 05-2014
DOI: 10.1021/NN501434A
Non-covalent surface modification of boron nitride nanotubes for enhanced catalysis
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3CC45667F
Abstract: Boron nitride nanotubes were functionalized with microperoxidase-11 in aqueous media, showing improved catalytic performance due to a strong electron coupling between the active centre of microperoxidase-11 and boron nitride nanotubes.
Boron nitride nanotube films grown from boron ink painting
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0JM01414A
Strong Coupling of Carbon Quantum Dots in Plasmonic Nanocavities
Publisher: American Chemical Society (ACS)
Date: 08-04-2020
High-resolution x-ray absorption studies of core excitons in hexagonal boron nitride
Publisher: AIP Publishing
Date: 05-11-2012
DOI: 10.1063/1.4767135
Electronic Polarizability as the Fundamental Variable in the Dielectric Properties of Two-Dimensional Materials
Publisher: American Chemical Society (ACS)
Date: 31-12-2019
DOI: 10.1021/ACS.NANOLETT.9B02982
Abstract: The dielectric constant, which defines the polarization of the media, is a key quantity in condensed matter. It determines several electronic and optoelectronic properties important for a plethora of modern technologies from computer memory to field effect transistors and communication circuits. Moreover, the importance of the dielectric constant in describing electromagnetic interactions through screening plays a critical role in understanding fundamental molecular interactions. Here, we show that despite its fundamental transcendence, the dielectric constant does not define unequivocally the dielectric properties of two-dimensional (2D) materials due to the locality of their electrostatic screening. Instead, the electronic polarizability correctly captures the dielectric nature of a 2D material which is united to other physical quantities in an atomically thin layer. We reveal a long-sought universal formalism where electronic, geometrical, and dielectric properties are intrinsically correlated through the polarizability, opening the door to probe quantities yet not directly measurable including the real covalent thickness of a layer. We unify the concept of dielectric properties in any material dimension finding a global dielectric anisotropy index defining their controllability through dimensionality.
In situ prepared V2O5/graphene hybrid as a superior cathode material for lithium-ion batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA04871D
Abstract: Developing synthetic methods for graphene based cathode materials, with low cost and in an environmentally friendly way, is necessary for industrial production.
Isotope effect on the thermal expansion coefficient of atomically thin boron nitride
Publisher: IOP Publishing
Date: 21-06-2021
Interfacial thermal conductance between atomically thin boron nitride and graphene
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2NR05985A
Abstract: The interfacial thermal conductance between graphene and atomically thin boron nitride has been experimentally measured for the first time.
Superhydrophobic and Superoleophilic Porous Boron Nitride Nanosheet/Polyvinylidene Fluoride Composite Material for Oil-Polluted Water Cleanup
Publisher: Wiley
Date: 03-11-2014
High yield BNNTs synthesis by promotion effect of milling-assisted precursor
Publisher: Elsevier BV
Date: 10-2013
Ex situ electrochemical sodiation/desodiation observation of Co3O4anchored carbon nanotubes: a high performance sodium-ion battery anode produced by pulsed plasma in a liquid
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR03335G
Abstract: A new liquid plasma method is used to fabricate a Co 3 O 4 /CNT nanocomposite anode using a nanosecond pulse atmospheric pressure for sodium-ion battery application.
Boron Nitride Nanosheets Improve Sensitivity and Reusability of Surface-Enhanced Raman Spectroscopy
Publisher: Wiley
Date: 26-04-2016
Abstract: Surface enhanced Raman spectroscopy (SERS) is a useful multidisciplinary analytic technique. However, it is still a challenge to produce SERS substrates that are highly sensitive, reproducible, stable, reusable, and scalable. Herein, we demonstrate that atomically thin boron nitride (BN) nanosheets have many unique and desirable properties to help solve this challenge. The synergic effect of the atomic thickness, high flexibility, stronger surface adsorption capability, electrical insulation, impermeability, high thermal and chemical stability of BN nanosheets can increase the Raman sensitivity by up to two orders, and in the meantime attain long-term stability and extraordinary reusability not achievable by other materials. These advances will greatly facilitate the wider use of SERS in many fields.
Graphene-based coatings on polymer films for gas barrier applications
Publisher: Elsevier BV
Date: 2016
Additive‐Free Nb2O5−TiO2 Hybrid Anode towards Low‐Cost and Safe Lithium‐Ion Batteries: A Green Electrode Material Produced in an Environmentally Friendly Process
Publisher: Wiley
Date: 20-11-2018
High-Q Phonon-polaritons in Spatially Confined Freestanding α-MoO3
Publisher: American Chemical Society (ACS)
Date: 16-02-2019
Mechanical properties of atomically thin boron nitride and the role of interlayer interactions
Publisher: Springer Science and Business Media LLC
Date: 22-06-2017
DOI: 10.1038/NCOMMS15815
Abstract: Atomically thin boron nitride (BN) nanosheets are important two-dimensional nanomaterials with many unique properties distinct from those of graphene, but investigation into their mechanical properties remains incomplete. Here we report that high-quality single-crystalline mono- and few-layer BN nanosheets are one of the strongest electrically insulating materials. More intriguingly, few-layer BN shows mechanical behaviours quite different from those of few-layer graphene under indentation. In striking contrast to graphene, whose strength decreases by more than 30% when the number of layers increases from 1 to 8, the mechanical strength of BN nanosheets is not sensitive to increasing thickness. We attribute this difference to the distinct interlayer interactions and hence sliding tendencies in these two materials under indentation. The significantly better interlayer integrity of BN nanosheets makes them a more attractive candidate than graphene for several applications, for ex le, as mechanical reinforcements.
Anomalous isotope effect on mechanical properties of single atomic layer Boron Nitride
Publisher: Springer Science and Business Media LLC
Date: 09-2023
Synthesis of High-Density Graphene Foams Using Nanoparticle Templates
Publisher: Springer International Publishing
Date: 2017
Supramolecular self-assembly of graphene oxide and metal nanoparticles into stacked multilayers by means of a multitasking protein ring
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5NR08632A
Abstract: Protein-mediated metal nanoparticles inclusion inside 3D GO.
Enhanced Piezoelectric Properties Enabled by Engineered Low-Dimensional Nanomaterials
Publisher: American Chemical Society (ACS)
Date: 14-07-2022
Boundary-Induced Auxiliary Features in Scattering-Type Near-Field Fourier Transform Infrared Spectroscopy
Publisher: American Chemical Society (ACS)
Date: 19-12-2020
Abstract: Phonon-polaritons (PhPs) in layered crystals, including hexagonal boron nitride (hBN), have been investigated by combined scattering-type scanning near-field optical microscopy (s-SNOM) and Fourier transform infrared (FTIR) spectroscopy. Nevertheless, many of such s-SNOM-based FTIR spectra features remain unexplored, especially those originated from the impact of boundaries. Here we observe real-space PhP propagations in thin-layer hBN sheets either supported or suspended by s-SNOM imaging. Then with a high-power broadband IR laser source, we identify two major peaks and multiple auxiliary peaks in the near-field litude spectra, obtained using scattering-type near-field FTIR spectroscopy, from both supported and suspended hBN. The major PhP propagation interference peak moves toward the major in-plane phonon peak when the IR illumination moves away from the hBN edge. Specific differences between the auxiliary peaks in the near-field litude spectra from supported and suspended hBN sheets are investigated regarding different boundary conditions, associated with edges and substrate interfaces. The outcomes may be explored in heterostructures for advanced nanophotonic applications.
Synthesis of boron nitride nanotubes by boron ink annealing
Publisher: IOP Publishing
Date: 15-02-2010
Boron Nitride Nanosheets for Metal Protection
Publisher: Wiley
Date: 24-07-2014
Gas Protection of Two-Dimensional Nanomaterials from High-Energy Impacts
Publisher: Springer Science and Business Media LLC
Date: 19-10-2017
DOI: 10.1038/SREP35532
Abstract: Two-dimensional (2D) materials can be produced using ball milling with the help of liquid surfactants or solid exfoliation agents, as ball milling of bulk precursor materials usually produces nanosized particles because of high-energy impacts. Post-milling treatment is thus needed to purify the nanosheets. We show here that nanosheets of graphene, BN, and MoS 2 can be produced by ball milling of their bulk crystals in the presence of ammonia or a hydrocarbon ethylene gas and the obtained nanosheets remain flat and maintain their single-crystalline structure with low defects density even after a long period of time post-milling treatment is not needed. This study does not just demonstrate production of nanosheets using ball milling, but reveals surprising indestructible behaviour of 2D nanomaterials in ammonia or hydrocarbon gas under the high-energy impacts in other milling atmospheres such as air, nitrogen or argon the same milling treatment produces nanosized particles. A systematic study reveals chemisorption of ammonia and hydrocarbon gases and chemical reactions occurring at defect sites, which heal the defects by saturating the dangling bonds. Density functional theory was used to understand the mechanism of mechanochemical reactions. Ball milling in ammonia or hydrocarbon is promising for mass-production of pure nanosheets.
High-efficient production of boron nitride nanosheets via an optimized ball milling process for lubrication in oil
Publisher: Springer Science and Business Media LLC
Date: 03-12-2014
DOI: 10.1038/SREP07288
Mechanical Property and Structure of Covalent Functionalised Graphene/Epoxy Nanocomposites
Publisher: Springer Science and Business Media LLC
Date: 14-03-2014
DOI: 10.1038/SREP04375
Strong Oxidation Resistance of Atomically Thin Boron Nitride Nanosheets
Publisher: American Chemical Society (ACS)
Date: 10-01-2014
DOI: 10.1021/NN500059S
Boron nitride nanotube reinforced polyurethane composites
Publisher: Elsevier BV
Date: 04-2013
Single deep ultraviolet light emission from boron nitride nanotube film
Publisher: AIP Publishing
Date: 04-10-2010
DOI: 10.1063/1.3497261
Abstract: Light in deep ultraviolet (DUV) region has a wide range of applications and the demand for finding DUV light emitting materials at nanoscale is increasingly urgent as they are vital for building miniaturized optic and optoelectronic devices. We discover that boron nitride nanotubes (BNNTs) with a well-crystallized cylindrical multiwall structure and diameters smaller than 10 nm can have single DUV emission at 225 nm (5.51 eV). The measured BNNTs are grown on substrate in the form of a thin film. This study suggests that BNNTs may work as nanosized DUV light sources for various applications.
High thermal conductivity of high-quality monolayer boron nitride and its thermal expansion
Publisher: American Association for the Advancement of Science (AAAS)
Date: 07-06-2019
Abstract: Atomically thin boron nitride is one of the best thermal conductors among semiconductors and insulators.
Near-Field Excited Archimedean-like Tiling Patterns in Phonon-Polaritonic Crystals
Publisher: American Chemical Society (ACS)
Date: 30-04-2021
Boron Nitride Nanosheet-Veiled Gold Nanoparticles for Surface Enhanced Raman Scattering
Publisher: American Chemical Society (ACS)
Date: 14-06-2016
Subnanometer Molybdenum Sulfide on Carbon Nanotubes as a Highly Active and Stable Electrocatalyst for Hydrogen Evolution Reaction
Publisher: American Chemical Society (ACS)
Date: 27-01-2016
Rapid and highly efficient growth of graphene on copper by chemical vapor deposition of ethanol
Publisher: Elsevier BV
Date: 11-2014
Mechanical Properties of Atomically Thin Tungsten Dichalcogenides: WS2, WSe2, and WTe2
Publisher: American Chemical Society (ACS)
Date: 27-01-2021
High-Temperature Growth of Graphene Films on Copper Foils by Ethanol Chemical Vapor Deposition
Publisher: American Chemical Society (ACS)
Date: 07-10-2013
DOI: 10.1021/JP407013Y
Hydrogen evolution by a metal-free electrocatalyst
Publisher: Springer Science and Business Media LLC
Date: 28-04-2014
DOI: 10.1038/NCOMMS4783
Structure and properties of biomedical films prepared from aqueous and acidic silk fibroin solutions
Publisher: Wiley
Date: 09-02-2011
DOI: 10.1002/JBM.A.33021
Inquisition of Microcystis aeruginosa and Synechocystis nanowires: characterization and modelling
Publisher: Springer Science and Business Media LLC
Date: 30-08-2015
DOI: 10.1007/S10482-015-0576-2
Abstract: Identification of extracellular conductive pilus-like structures (PLS) i.e. microbial nanowires has spurred great interest among scientists due to their potential applications in the fields of biogeochemistry, bioelectronics, bioremediation etc. Using conductive atomic force microscopy, we identified microbial nanowires in Microcystis aeruginosa PCC 7806 which is an aerobic, photosynthetic microorganism. We also confirmed the earlier finding that Synechocystis sp. PCC 6803 produces microbial nanowires. In contrast to the use of highly instrumented continuous flow reactors for Synechocystis reported earlier, we identified simple and optimum culture conditions which allow increased production of nanowires in both test cyanobacteria. Production of these nanowires in Synechocystis and Microcystis were found to be sensitive to the availability of carbon source and light intensity. These structures seem to be proteinaceous in nature and their diameter was found to be 4.5-7 and 8.5-11 nm in Synechocystis and M. aeruginosa, respectively. Characterization of Synechocystis nanowires by transmission electron microscopy and biochemical techniques confirmed that they are type IV pili (TFP) while nanowires in M. aeruginosa were found to be similar to an unnamed protein (GenBank : CAO90693.1). Modelling studies of the Synechocystis TFP subunit i.e. PilA1 indicated that strategically placed aromatic amino acids may be involved in electron transfer through these nanowires. This study identifies PLS from Microcystis which can act as nanowires and supports the earlier hypothesis that microbial nanowires are widespread in nature and play erse roles.
Perforation routes towards practical nano-porous graphene and analogous materials engineering
Publisher: Elsevier BV
Date: 12-2019
Enhancement of electrical and thermal conductivity of Su-8 photocrosslinked coatings containing graphene
Publisher: Elsevier BV
Date: 09-2015
Ball milling: a green mechanochemical approach for synthesis of nitrogen doped carbon nanoparticles
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3NR02328A
Abstract: Technological and scientific challenges coupled with environmental considerations have attracted a search for robust, green and energy-efficient synthesis and processing routes for advanced functional nanomaterials. In this article, we demonstrate a high-energy ball milling technique for large-scale synthesis of nitrogen doped carbon nanoparticles, which can be used as an electro-catalyst for oxygen reduction reactions after a structural refinement with controlled thermal annealing. The resulting carbon nanoparticles exhibited competitive catalytic activity (5.2 mA cm(-2) kinetic-limiting current density compared with 7.6 mA cm(-2) on Pt/C reference) and excellent methanol tolerance compared to a commercial Pt/C catalyst. The proposed synthesis route by ball milling and annealing is an effective process for carbon nanoparticle production and efficient nitrogen doping, providing a large-scale production method for the development of highly efficient and practical electrocatalysts.
Photoluminescence of boron nitride nanosheets exfoliated by ball milling
Publisher: AIP Publishing
Date: 25-06-2012
DOI: 10.1063/1.4731203
Abstract: The photoluminescence of boron nitride (BN) nanosheets exfoliated by ball milling method has been investigated. At room temperature, the nanosheets have strong deep ultraviolet (DUV) light emission at 224 nm and weak defect-related UV (∼300 nm) emission. The DUV peak profile slightly changes with the increase of milling time due to the increase of stacking faults caused by the shear force during milling. The decreased ∼300 nm emission after milling treatments has been attributed to the preferential orientation of the BN nanosheets on substrate and the strong polarization anisotropy of BN materials in luminescence.
Biocompatibility of boron nitride nanosheets
Publisher: Springer Science and Business Media LLC
Date: 08-06-2018
Raman signature and phonon dispersion of atomically thin boron nitride
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6NR09312D
Abstract: Raman spectroscopy has become an essential technique to characterize and investigate graphene and many other two-dimensional materials. However, there is still a lack of consensus on the Raman signature and phonon dispersion of atomically thin boron nitride (BN), which has many unique properties distinct from graphene. Such a knowledge gap greatly affects the understanding of the basic physical and chemical properties of atomically thin BN as well as the use of Raman spectroscopy to study these nanomaterials. Here, we use both experiment and simulation to reveal the intrinsic Raman signature of monolayer and few-layer BN. We find experimentally that atomically thin BN without interaction with a substrate has a G band frequency similar to that of bulk hexagonal BN (hBN), but strain induced by the substrate can cause a pronounced Raman shift. This is in excellent agreement with our first-principles density functional theory (DFT) calculations at two levels of theory, including van der Waals dispersion forces (opt-vdW) and a fraction of the exact exchange from Hartree-Fock (HF) theory through the hybrid HSE06 functional. Both calculations demonstrate that the intrinsic E
Synthesis of high density boron nitride nanotube film
Publisher: Trans Tech Publications, Ltd.
Date: 07-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.562-565.926
Abstract: Antiwetting BNNT films have been achieved by milling-ink method. Superhydrophobic (CA °) are demonstrated on films with stainless steel as substrate. The high density and purity are confirmed by EDX and NEXAFS. There are only a few oxygen point defects in the form of nitrogen vacancies due to ink and annealing process in air.
Advancement in liquid exfoliation of graphite through simultaneously oxidizing and ultrasonicating
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TA04367G
Abstract: Simultaneously oxidizing and ultrasonicating graphite for 60 min can create high-structural integrity yet solution-processable graphene for a great many applications.
Two-Dimensional Van der Waals Heterostructures for Synergistically Improved Surface-Enhanced Raman Spectroscopy
Publisher: American Chemical Society (ACS)
Date: 22-04-2020
Interfacial reactions between titanium and boron nitride nanotubes
Publisher: Elsevier BV
Date: 2017
Controlling Wettability of Boron Nitride Nanotube Films and Improved Cell Proliferation
Publisher: American Chemical Society (ACS)
Date: 16-08-2012
DOI: 10.1021/JP306148E
Molecule-Level g-C3N4 Coordinated Transition Metals as a New Class of Electrocatalysts for Oxygen Electrode Reactions
Publisher: American Chemical Society (ACS)
Date: 27-02-2017
DOI: 10.1021/JACS.6B13100
Abstract: Organometallic complexes with metal-nitrogen/carbon (M-N/C) coordination are the most important alternatives to precious metal catalysts for oxygen reduction and evolution reactions (ORR and OER) in energy conversion devices. Here, we designed and developed a range of molecule-level graphitic carbon nitride (g-C
Asymmetric electric field screening in van der Waals heterostructures
Publisher: Springer Science and Business Media LLC
Date: 28-03-2018
DOI: 10.1038/S41467-018-03592-3
Abstract: A long-standing challenge facing the combination of two-dimensional crystals into heterojunction is the unknown effect of mixing layer of different electronic properties (semiconductors, metals, insulators) on the screening features of the fabricated device platforms including their functionality. Here we use a compelling set of theoretical and experimental techniques to elucidate the intrinsic dielectric screening properties of heterostructures formed by MoS 2 and graphene layers. We experimentally observed an asymmetric field screening effect relative to the polarization of the applied gate bias into the surface. Surprisingly, such behavior allows selection of the electronic states that screen external fields, and it can be enhanced with increasing of the number of layers of the semiconducting MoS 2 rather than the semi-metal. This work not only provides unique insights on the screening properties of a vast amount of heterojunction fabricated so far, but also uncovers the great potential of controlling a fundamental property for device applications.
Large-scale mechanical peeling of boron nitride nanosheets by low-energy ball milling
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1JM11192B
Atomically thin boron nitride nanodisks
Publisher: Elsevier BV
Date: 09-2013
Two-dimensional Na–Cl crystals of unconventional stoichiometries on graphene surface from dilute solution at ambient conditions
Publisher: Springer Science and Business Media LLC
Date: 07-05-2018
DOI: 10.1038/S41557-018-0061-4
Abstract: NaCl in a 1:1 stoichiometry is the only known stable form of the Na-Cl crystal under ambient conditions, and non-1:1 Na-Cl species can only form under extreme conditions, such as high pressures. Here we report the direct observation, under ambient conditions, of Na
Highly efficient oxygen evolution from CoS2/CNT nanocomposites via a one-step electrochemical deposition and dissolution method
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7NR01293D
Abstract: The oxygen evolution reaction (OER) has been viewed as a critical step in electrochemical energy conversion and storage devices. However, searching for cheap and efficient OER electrocatalysts still remains an urgent task. Herein, we develop a new strategy involving a one-step electrochemical deposition and dissolution method to fabricate hydrophilic porous CoS
Identification and topographical characterisation of microbial nanowires in Nostoc punctiforme
Publisher: Springer Science and Business Media LLC
Date: 11-01-2016
DOI: 10.1007/S10482-015-0644-7
Abstract: Extracellular pili-like structures (PLS) produced by cyanobacteria have been poorly explored. We have done detailed topographical and electrical characterisation of PLS in Nostoc punctiforme PCC 73120 using transmission electron microscopy (TEM) and conductive atomic force microscopy (CAFM). TEM analysis showed that N. punctiforme produces two separate types of PLS differing in their length and diameter. The first type of PLS are 6-7.5 nm in diameter and 0.5-2 µm in length (short/thin PLS) while the second type of PLS are ~20-40 nm in diameter and more than 10 µm long (long/thick PLS). This is the first study to report long/thick PLS in N. punctiforme. Electrical characterisation of these two different PLS by CAFM showed that both are electrically conductive and can act as microbial nanowires. This is the first report to show two distinct PLS and also identifies microbial nanowires in N. punctiforme. This study paves the way for more detailed investigation of N. punctiforme nanowires and their potential role in cell physiology and symbiosis with plants.
Quantum Emission from Defects in Single-Crystalline Hexagonal Boron Nitride
Publisher: American Physical Society (APS)
Date: 10-03-2016
Vibronic fine structure in high-resolution x-ray absorption spectra from ion-bombarded boron nitride nanotubes
Publisher: American Vacuum Society
Date: 03-04-2013
DOI: 10.1116/1.4798271
Abstract: The authors have applied high-resolution near-edge x-ray absorption fine structure measurements around the nitrogen K-edge to study the effects of ion-bombardment on near-surface properties of boron nitride nanotubes. A notable difference has been observed between surface sensitive partial electron yield (PEY) and bulk sensitive total electron yield (TEY) fine-structure measurements. The authors assign the PEY fine structure to the coupling of excited molecular vibrational modes to electronic transitions in NO molecules trapped just below the surface. Oxidation resistance of the boron nitride nanotubes is significantly reduced by low energy ion bombardment, as broken B-N bonds are replaced by N-O bonds involving oxygen present in the surface region. In contrast to the PEY spectra, the bulk sensitive TEY measurements on as-grown s les do not exhibit any fine structure while the ion-bombarded s les show a clear vibronic signature of molecular nitrogen.
Synthesis of Composite Nanosheets of Graphene and Boron Nitride and Their Lubrication Application in Oil
Publisher: Wiley
Date: 29-09-2018
Porous carbon nanotube/polyvinylidene fluoride composite material: Superhydrophobicity/superoleophilicity and tunability of electrical conductivity
Publisher: Elsevier BV
Date: 10-2014
Lithium storage in disordered graphitic materials: a semi-quantitative study of the relationship between structure disordering and capacity
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4CP05589F
Abstract: Disordered graphite can store more Li ions in a battery but acts as a supercapacitor.
Decoration of nitrogen vacancies by oxygen atoms in boron nitride nanotubes
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0CP00984A
Abstract: Decoration of nitrogen vacancies by oxygen atoms has been studied by near-edge X-ray absorption fine structure (NEXAFS) around B K-edge in several boron nitride (BN) structures, including bamboo-like and multi-walled BN nanotubes. Breaking of B-N bonds and formation of nitrogen vacancies under low-energy ion bombardment reduces oxidation resistance of BN structures and promotes an efficient oxygen-healing mechanism, in full agreement with some recent theoretical predictions. The formation of mixed O-B-N and B-O bonds is clearly identified by well-resolved peaks in NEXAFS spectra of excited boron atoms.
The Magnetic Genome of Two-Dimensional van der Waals Materials
Publisher: American Chemical Society (ACS)
Date: 20-04-2022
Rigorous and Accurate Contrast Spectroscopy for Ultimate Thickness Determination of Micrometer-Sized Graphene on Gold and Molecular Sensing
Publisher: American Chemical Society (ACS)
Date: 29-05-2018
Abstract: The thickness of graphene films can be accurately determined by optical contrast spectroscopy. However, this becomes challenging and complicated when the flake size reduces to the micrometer scale, where the contrast spectrum is sensitively dependent on the polarization and incident angle of light. Here, we report accurate measurement of the optical contrast spectra of micrometer-sized few-layer graphene flakes on Au substrate. Using a high-resolution optical microscopy with a 100× magnification objective, we accurately determined the layer numbers of flakes as small as one micrometer in lateral size. We developed a theoretical model to accurately take into account the appropriate contribution of light incident at various angles and polarizations, which matched the experimental results extremely well. Furthermore, we demonstrate that the optical contrast spectroscopy is highly sensitive to detect the adsorption of submonolayer airborne hydrocarbon molecules, which can reveal whether graphene is contaminated. Though the technique was demonstrated on graphene, it can be readily generalized to many other two-dimensional materials, which opens new avenues for developing miniaturized and ultrasensitive label-free molecular sensors.
In situ doping and synthesis of two-dimensional nanomaterials using mechano-chemistry
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8NH00369F
Abstract: A new in situ , simple and economical method, that combines both doping (carbon or nitrogen) and mechanical exfoliation processes to produce large quantities of doped nanosheets in one-step.
Boron nitride nanotube reinforced titanium metal matrix composites with excellent high-temperature performance
Publisher: Springer Science and Business Media LLC
Date: 29-08-2017
DOI: 10.1557/JMR.2017.345
Disorder in ball-milled graphite revealed by Raman spectroscopy
Publisher: Elsevier BV
Date: 06-2013
Humidity sensing properties of single Au-decorated boron nitride nanotubes
Publisher: Elsevier BV
Date: 05-2013
Bulk Hexagonal Boron Nitride with a Quasi-Isotropic Thermal Conductivity
Publisher: Wiley
Date: 11-05-2018
Large area fabrication of self-standing nanoporous graphene-on-PMMA substrate
Publisher: Elsevier BV
Date: 12-2016
Highly Compressive Boron Nitride Nanotube Aerogels Reinforced with Reduced Graphene Oxide
Publisher: American Chemical Society (ACS)
Date: 15-06-2019
Abstract: Boron nitride nanotubes (BNNTs), structural analogues of carbon nanotubes, have attracted significant attention due to their superb thermal conductivity, wide bandgap, excellent hydrogen storage capacity, and thermal and chemical stability. Despite considerable progress in the preparation and surface functionalization of BNNTs, it remains a challenge to assemble one-dimensional BNNTs into three-dimensional (3D) architectures (such as aerogels) for practical applications. Here, we report a highly compressive BNNT aerogel reinforced with reduced graphene oxide (rGO) fabricated using a freeze-drying method. The reinforcement effect of rGO and 3D honeycomb-like framework offer the BNNTs/rGO aerogel with a high compression resilience. The BNNTs/rGO aerogels were then infiltrated with polyethylene glycol to prepare a kind of phase change materials. The prepared phase change material composites show zero leakage even at 100 °C and enhanced thermal conductivity, due to the 3D porous structure of the BNNTs/rGO aerogel. This work provides a simple method for the preparation of 3D BNNTs/rGO aerogels for many potential applications, such as high-performance polymer composites.
Fabrication of Boron Nitride Nanotube–Gold Nanoparticle Hybrids Using Pulsed Plasma in Liquid
Publisher: American Chemical Society (ACS)
Date: 25-08-2014
DOI: 10.1021/LA502960H
Abstract: Plasma, generated in liquid at atmospheric pressure by a nanosecond pulsed voltage, was used to fabricate hybrid structures from boron nitride nanotubes and gold nanoparticles in deionized water. The pH was greatly reduced, conductivity was significantly increased, and concentrations of reactive oxygen and nitrogen species in the water were increased by the plasma treatment. The treatment reduced the length of the nanotubes, giving more in idual cuplike structures, and introduced functional groups onto the surface. Gold nanoparticles were successively assembled onto the functionalized surfaces. The reactive species from the liquid plasma along with the nanosecond pulsed electric field seem to play a role in the shortening and functionalization of the nanotubes and the assembly of gold nanoparticles. The potential for targeted drug delivery was tested in a preliminary investigation using doxorubicin-loaded plasma-treated nanotubes which were effective at killing ∼99% of prostate cancer cells.
Insight into reactions and interface between boron nitride nanotube and aluminum
Publisher: Springer Science and Business Media LLC
Date: 25-09-2012
DOI: 10.1557/JMR.2012.294
Effect of warm rolling and annealing on the mechanical properties of aluminum composite reinforced with boron nitride nanotubes
Publisher: Elsevier BV
Date: 2018
Observation of Active Sites for Oxygen Reduction Reaction on Nitrogen-Doped Multilayer Graphene
Publisher: American Chemical Society (ACS)
Date: 03-06-2014
DOI: 10.1021/NN501506P
Abstract: Active sites and the catalytic mechanism of nitrogen-doped graphene in an oxygen reduction reaction (ORR) have been extensively studied but are still inconclusive, partly due to the lack of an experimental method that can detect the active sites. It is proposed in this report that the active sites on nitrogen-doped graphene can be determined via the examination of its chemical composition change before and after ORR. Synchrotron-based X-ray photoelectron spectroscopy analyses of three nitrogen-doped multilayer graphene s les reveal that oxygen reduction intermediate OH(ads), which should chemically attach to the active sites, remains on the carbon atoms neighboring pyridinic nitrogen after ORR. In addition, a high amount of the OH(ads) attachment after ORR corresponds to a high catalytic efficiency and vice versa. These pinpoint that the carbon atoms close to pyridinic nitrogen are the main active sites among the different nitrogen doping configurations.
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