55 results found
Chong JY, Wang B, Mattevi C, et al., 2018, Dynamic microstructure of graphene oxide membranes and the permeation flux, JOURNAL OF MEMBRANE SCIENCE, Vol: 549, Pages: 385-392, ISSN: 0376-7388
Henck H, Ben Aziza Z, Pierucci D, et al., 2018, Electronic band structure of Two-Dimensional WS2/Graphene van der Waals Heterostructures, PHYSICAL REVIEW B, Vol: 97, ISSN: 2469-9950
Wakamura T, Reale F, Palczynski P, et al., 2018, Strong anisotropic spin-orbit interaction induced in graphene by monolayer WS₂, Physical Review Letters, Vol: 120, ISSN: 0031-9007
We demonstrate strong anisotropic spin-orbit interaction (SOI) in graphene induced by monolayer WS₂. Direct comparison between graphene-monolayer WS2 and graphene-bulk WS₂ systems in magnetotransport measurements reveals that monolayer transition metal dichalcogenide can induce much stronger SOI than bulk. Detailed theoretical analysis of the weak antilocalization curves gives an estimated spin-orbit energy (Eso) higher than 10 meV. The symmetry of the induced SOI is also discussed, and the dominant z → −z symmetric SOI can only explain the experimental results. Spin relaxation by the Elliot-Yafet mechanism and anomalous resistance increase with temperature close to the Dirac point indicates Kane-Mele SOI induced in graphene.
Amit I, Octon TJ, Townsend NJ, et al., 2017, Role of Charge Traps in the Performance of Atomically Thin Transistors, ADVANCED MATERIALS, Vol: 29, ISSN: 0935-9648
Bekaert J, Bignardi L, Aperis A, et al., 2017, Free surfaces recast superconductivity in few-monolayer MgB2: Combined first-principles and ARPES demonstration., Sci Rep, Vol: 7
Two-dimensional materials are known to harbour properties very different from those of their bulk counterparts. Recent years have seen the rise of atomically thin superconductors, with a caveat that superconductivity is strongly depleted unless enhanced by specific substrates, intercalants or adatoms. Surprisingly, the role in superconductivity of electronic states originating from simple free surfaces of two-dimensional materials has remained elusive to date. Here, based on first-principles calculations, anisotropic Eliashberg theory, and angle-resolved photoemission spectroscopy (ARPES), we show that surface states in few-monolayer MgB2 make a major contribution to the superconducting gap spectrum and density of states, clearly distinct from the widely known, bulk-like σ- and π-gaps. As a proof of principle, we predict and measure the gap opening on the magnesium-based surface band up to a critical temperature as high as ~30 K for merely six monolayers thick MgB2. These findings establish free surfaces as an unavoidable ingredient in understanding and further tailoring of superconductivity in atomically thin materials.
Olowojoba GB, Kopsidas S, Eslava S, et al., 2017, A facile way to produce epoxy nanocomposites having excellent thermal conductivity with low contents of reduced graphene oxide, JOURNAL OF MATERIALS SCIENCE, Vol: 52, Pages: 7323-7344, ISSN: 0022-2461
Pesci FM, Sokolikova MS, Grotta C, et al., 2017, MoS 2 /WS 2 Heterojunction for Photoelectrochemical Water Oxidation, ACS Catalysis, Vol: 7, Pages: 4990-4998, ISSN: 2155-5435
Reale F, Palczynski P, Amit I, et al., 2017, High-Mobility and High-Optical Quality Atomically Thin WS2, SCIENTIFIC REPORTS, Vol: 7, ISSN: 2045-2322
Sokolikova MS, Sherrell PC, Palczynski P, et al., 2017, Room-temperature growth of colloidal Bi2Te3 nanosheets, CHEMICAL COMMUNICATIONS, Vol: 53, Pages: 8026-8029, ISSN: 1359-7345
Song W, Lischner J, Rocha VG, et al., 2017, Tuning the Double Layer of Graphene Oxide through Phosphorus Doping for Enhanced Supercapacitance, ACS ENERGY LETTERS, Vol: 2, Pages: 1144-1149, ISSN: 2380-8195
Kien-Cuong P, Chang Y-H, McPhail DS, et al., 2016, Amorphous Molybdenum Sulfide on Graphene-Carbon Nanotube Hybrids as Highly Active Hydrogen Evolution Reaction Catalysts, ACS APPLIED MATERIALS & INTERFACES, Vol: 8, Pages: 5961-5971, ISSN: 1944-8244
Kien-Cuong P, McPhail DS, Mattevi C, et al., 2016, Graphene-Carbon Nanotube Hybrids as Robust Catalyst Supports in Proton Exchange Membrane Fuel Cells, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 163, Pages: F255-F263, ISSN: 0013-4651
Mansor N, Jia J, Miller TS, et al., 2016, Graphitic Carbon Nitride-Graphene Hybrid Nanostructure as a Catalyst Support for Polymer Electrolyte Membrane Fuel Cells, POLYMER ELECTROLYTE FUEL CELLS 16 (PEFC 16), Vol: 75, Pages: 885-897, ISSN: 1938-5862
Mansor N, Miller TS, Dedigama I, et al., 2016, Graphitic Carbon Nitride as a Catalyst Support in Fuel Cells and Electrolyzers, ELECTROCHIMICA ACTA, Vol: 222, Pages: 44-57, ISSN: 0013-4686
Olowojoba GB, Eslava S, Gutierrez ES, et al., 2016, In situ thermally reduced graphene oxide/epoxy composites: thermal and mechanical properties, APPLIED NANOSCIENCE, Vol: 6, Pages: 1015-1022, ISSN: 2190-5509
Pierin G, Grotta C, Colombo P, et al., 2016, Direct Ink Writing of micrometric SiOC ceramic structures using a preceramic polymer, Journal of the European Ceramic Society, Vol: 36, Pages: 1589-1594, ISSN: 0955-2219
© 2016 Elsevier Ltd. In this work we manufactured micro-sized SiOC ceramic components by 3D printing (Direct Ink Writing) of a preceramic polymer. Model porous ceramic scaffolds with the lateral dimension of a few millimeters and composed of a continuous ceramic filament ~120 μm thick were produced, and a suitable rheological behavior was obtained by mixing cross-linked preceramic particles with a siloxane resin dissolved in a solvent. The addition of a low amount (0.025-0.1 wt%) of graphene oxide to the ink formulation further improves the structural stability during pyrolysis reducing the shrinkage of the preceramic polymer. Upon pyrolysis at low temperature (1000 °C), graphene oxide converted into graphene. The resulting scaffolds possess a good compression strength, of ~2.5 MPa for a total porosity of ~64 vol% (~3.1 MPa after the addition of 0.1 wt% graphene oxide).
Reale F, Sharda K, Mattevi C, 2016, From bulk crystals to atomically thin layers of group VI-transition metal dichalcogenides vapour phase synthesis, APPLIED MATERIALS TODAY, Vol: 3, Pages: 11-22, ISSN: 2352-9407
Sherrell PC, Mattevi C, 2016, Mesoscale design of multifunctional 3D graphene networks, MATERIALS TODAY, Vol: 19, Pages: 428-436, ISSN: 1369-7021
Yamaguchi H, Ogawa S, Watanabe D, et al., 2016, Valence-band electronic structure evolution of graphene oxide upon thermal annealing for optoelectronics, Physica Status Solidi (A) Applications and Materials Science, Vol: 213, Pages: 2380-2386, ISSN: 1862-6300
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim We report valence-band electronic structure evolution of graphene oxide (GO) upon its thermal reduction. The degree of oxygen functionalization was controlled by annealing temperature, and an electronic structure evolution was monitored using real-time ultraviolet photoelectron spectroscopy. We observed a drastic increase in the density of states around the Fermi level upon thermal annealing at ∼600 °C. The result indicates that while there is an apparent bandgap for GO prior to a thermal reduction, the gap closes after an annealing around that temperature. This trend of bandgap closure was correlated with the electrical, chemical, and structural properties to determine a set of GO material properties that is optimal for optoelectronics. The results revealed that annealing at a temperature of ∼500 °C leads to the desired properties, demonstrated by a uniform and an order of magnitude enhanced photocurrent map of an individual GO sheet compared to an as-synthesized counterpart.
Aba NFD, Chong JY, Wang B, et al., 2015, Graphene oxide membranes on ceramic hollow fibers - Microstructural stability and nanofiltration performance, JOURNAL OF MEMBRANE SCIENCE, Vol: 484, Pages: 87-94, ISSN: 0376-7388
Chong JY, Aba NFD, Wang B, et al., 2015, UV-Enhanced Sacrificial Layer Stabilised Graphene Oxide Hollow Fibre Membranes for Nanofiltration, SCIENTIFIC REPORTS, Vol: 5, ISSN: 2045-2322
Ni N, Barg S, Garcia-Tunon E, et al., 2015, Understanding Mechanical Response of Elastomeric Graphene Networks, SCIENTIFIC REPORTS, Vol: 5, ISSN: 2045-2322
Barg S, Perez FM, Ni N, et al., 2014, Mesoscale assembly of chemically modified graphene into complex cellular networks, NATURE COMMUNICATIONS, Vol: 5, ISSN: 2041-1723
Favaro M, Agnoli S, Di Valentin C, et al., 2014, TiO<inf>2</inf>/graphene nanocomposites from the direct reduction of graphene oxide by metal evaporation, Carbon, Vol: 68, Pages: 319-329, ISSN: 0008-6223
We demonstrate that graphene oxide can be efficiently reduced by evaporating metal Titanium in high vacuum. A detailed description of this reaction is provided by combining in situ photoemission spectroscopy measurements and DFT calculations: the titanium atoms readily react with the oxygenated groups of graphene oxide, disrupting the C-O bonds, with the consequent formation of titania and the recovery of the sp 2 hybridized carbon atoms. When all surface oxygen is consumed, titanium can react with the carbon substrate and form carbidic species. Resonant photoemission spectroscopy measurements allow identifying the presence and exact energy position in the valence band of the Ti-C and Ti-O-C states, which are supposed to control the electron and energy transfer across the TiO 2 /graphene interface. Therefore with this study we provide a versatile method and the rationale for controlling, at the atomic level, the nature of the interface of graphene/metal oxide nanocomposites. © 2013 Elsevier Ltd. All rights reserved.
Gregory A, Hao L, Klein N, et al., 2014, Spatially resolved electrical characterisation of graphene layers by an evanescent field microwave microscope, PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, Vol: 56, Pages: 431-434, ISSN: 1386-9477
Kim H, Mattevi C, Kim HJ, et al., 2013, Optoelectronic properties of graphene thin films deposited by a Langmuir-Blodgett assembly, NANOSCALE, Vol: 5, Pages: 12365-12374, ISSN: 2040-3364
Kim H, Saiz E, Chhowalla M, et al., 2013, Modeling of the self-limited growth in catalytic chemical vapor deposition of graphene, NEW JOURNAL OF PHYSICS, Vol: 15, ISSN: 1367-2630
Mattevi C, Colléaux F, Kim H, et al., 2013, Low-voltage graphene transistors based on self-assembled monolayer nanodielectrics, Materials Research Society Symposium Proceedings, Vol: 1451, Pages: 179-184, ISSN: 0272-9172
We demonstrate low operating voltage ( < |1.5|V) chemical vapour deposited (CVD) graphene transistors using solution processable organic self-assembled monolayers (SAMs) as nanodielectrics. The transistors show weak extrinsic doping, hysteresis-free operation, low gate-leakage current and good operating stability with bias-stress free characteristics. Most importantly we demonstrate that the Dirac potential can be finely tuned by modifying the molecular end-group of the SAMs without compromising the electrical characteristics of the transistors. © 2012 Materials Research Society.
Meca E, Lowengrub J, Kim H, et al., 2013, Epitaxial Graphene Growth and Shape Dynamics on Copper: Phase-Field Modeling and Experiments, NANO LETTERS, Vol: 13, Pages: 5692-5697, ISSN: 1530-6984
Pham K-C, Chua DHC, McPhail DS, et al., 2013, Graphene nanoflakes carbon nanotubes hybrid as highly robust catalyst support in proton exchange membrane fuel cells, 246th National Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
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