Imperial College London

DrCeciliaMattevi

Faculty of EngineeringDepartment of Materials

Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 0833c.mattevi

 
 
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Location

 

LM04ARoyal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

55 results found

Chong JY, Wang B, Mattevi C, Li Ket al., 2018, Dynamic microstructure of graphene oxide membranes and the permeation flux, JOURNAL OF MEMBRANE SCIENCE, Vol: 549, Pages: 385-392, ISSN: 0376-7388

JOURNAL ARTICLE

Henck H, Ben Aziza Z, Pierucci D, Laourine F, Reale F, Palczynski P, Chaste J, Silly MG, Bertran F, Le Fevre P, Lhuillier E, Wakamura T, Mattevi C, Rault JE, Calandra M, Ouerghi Aet al., 2018, Electronic band structure of Two-Dimensional WS2/Graphene van der Waals Heterostructures, PHYSICAL REVIEW B, Vol: 97, ISSN: 2469-9950

JOURNAL ARTICLE

Wakamura T, Reale F, Palczynski P, Gueron S, Mattevi C, Bouchiat Het 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.

JOURNAL ARTICLE

Amit I, Octon TJ, Townsend NJ, Reale F, Wright CD, Mattevi C, Craciun MF, Russo Set al., 2017, Role of Charge Traps in the Performance of Atomically Thin Transistors, ADVANCED MATERIALS, Vol: 29, ISSN: 0935-9648

JOURNAL ARTICLE

Bekaert J, Bignardi L, Aperis A, van Abswoude P, Mattevi C, Gorovikov S, Petaccia L, Goldoni A, Partoens B, Oppeneer PM, Peeters FM, Milošević MV, Rudolf P, Cepek Cet 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.

JOURNAL ARTICLE

Olowojoba GB, Kopsidas S, Eslava S, Gutierrez ES, Kinloch AJ, Mattevi C, Rocha VG, Taylor ACet 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

JOURNAL ARTICLE

Pesci FM, Sokolikova MS, Grotta C, Sherrell PC, Reale F, Sharda K, Ni N, Palczynski P, Mattevi Cet al., 2017, MoS 2 /WS 2 Heterojunction for Photoelectrochemical Water Oxidation, ACS Catalysis, Vol: 7, Pages: 4990-4998, ISSN: 2155-5435

JOURNAL ARTICLE

Reale F, Palczynski P, Amit I, Jones GF, Mehew JD, Bacon A, Ni N, Sherrell PC, Agnoli S, Craciun MF, Russo S, Mattevi Cet al., 2017, High-Mobility and High-Optical Quality Atomically Thin WS2, SCIENTIFIC REPORTS, Vol: 7, ISSN: 2045-2322

JOURNAL ARTICLE

Sokolikova MS, Sherrell PC, Palczynski P, Bemmer VL, Mattevi Cet al., 2017, Room-temperature growth of colloidal Bi2Te3 nanosheets, CHEMICAL COMMUNICATIONS, Vol: 53, Pages: 8026-8029, ISSN: 1359-7345

JOURNAL ARTICLE

Song W, Lischner J, Rocha VG, Qin H, Qi J, Hadden JHL, Mattevi C, Xie F, Riley DJet 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

JOURNAL ARTICLE

Kien-Cuong P, Chang Y-H, McPhail DS, Mattevi C, Wee ATS, Chua DHCet 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

JOURNAL ARTICLE

Kien-Cuong P, McPhail DS, Mattevi C, Wee ATS, Chua DHCet 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

JOURNAL ARTICLE

Mansor N, Jia J, Miller TS, Suter T, Jorge AB, Gibbs C, Shearing P, McMillan PF, Mattevi C, Shaffer M, Brett DJLet 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

JOURNAL ARTICLE

Mansor N, Miller TS, Dedigama I, Jorge AB, Jia J, Brazdova V, Mattevi C, Gibbs C, Hodgson D, Shearing PR, Howard CA, Cora F, Shaffer M, Brett DJL, McMillan PFet al., 2016, Graphitic Carbon Nitride as a Catalyst Support in Fuel Cells and Electrolyzers, ELECTROCHIMICA ACTA, Vol: 222, Pages: 44-57, ISSN: 0013-4686

JOURNAL ARTICLE

Olowojoba GB, Eslava S, Gutierrez ES, Kinloch AJ, Mattevi C, Rocha VG, Taylor ACet al., 2016, In situ thermally reduced graphene oxide/epoxy composites: thermal and mechanical properties, APPLIED NANOSCIENCE, Vol: 6, Pages: 1015-1022, ISSN: 2190-5509

JOURNAL ARTICLE

Pierin G, Grotta C, Colombo P, Mattevi Cet 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).

JOURNAL ARTICLE

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

JOURNAL ARTICLE

Sherrell PC, Mattevi C, 2016, Mesoscale design of multifunctional 3D graphene networks, MATERIALS TODAY, Vol: 19, Pages: 428-436, ISSN: 1369-7021

JOURNAL ARTICLE

Yamaguchi H, Ogawa S, Watanabe D, Hozumi H, Gao Y, Eda G, Mattevi C, Fujita T, Yoshigoe A, Ishizuka S, Adamska L, Yamada T, Dattelbaum AM, Gupta G, Doorn SK, Velizhanin KA, Teraoka Y, Chen M, Htoon H, Chhowalla M, Mohite AD, Takakuwa Yet 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.

JOURNAL ARTICLE

Aba NFD, Chong JY, Wang B, Mattevi C, Li Ket 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

JOURNAL ARTICLE

Chong JY, Aba NFD, Wang B, Mattevi C, Li Ket al., 2015, UV-Enhanced Sacrificial Layer Stabilised Graphene Oxide Hollow Fibre Membranes for Nanofiltration, SCIENTIFIC REPORTS, Vol: 5, ISSN: 2045-2322

JOURNAL ARTICLE

Ni N, Barg S, Garcia-Tunon E, Perez FM, Miranda M, Lu C, Mattevi C, Saiz Eet al., 2015, Understanding Mechanical Response of Elastomeric Graphene Networks, SCIENTIFIC REPORTS, Vol: 5, ISSN: 2045-2322

JOURNAL ARTICLE

Barg S, Perez FM, Ni N, Pereira PDV, Maher RC, Garcia-Tunon E, Eslava S, Agnoli S, Mattevi C, Saiz Eet al., 2014, Mesoscale assembly of chemically modified graphene into complex cellular networks, NATURE COMMUNICATIONS, Vol: 5, ISSN: 2041-1723

JOURNAL ARTICLE

Favaro M, Agnoli S, Di Valentin C, Mattevi C, Cattelan M, Artiglia L, Magnano E, Bondino F, Nappini S, Granozzi Get 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.

JOURNAL ARTICLE

Gregory A, Hao L, Klein N, Gallop J, Mattevi C, Shaforost O, Lees K, Clarke Bet 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

JOURNAL ARTICLE

Kim H, Mattevi C, Kim HJ, Mittal A, Mkhoyan KA, Riman RE, Chhowalla Met al., 2013, Optoelectronic properties of graphene thin films deposited by a Langmuir-Blodgett assembly, NANOSCALE, Vol: 5, Pages: 12365-12374, ISSN: 2040-3364

JOURNAL ARTICLE

Kim H, Saiz E, Chhowalla M, Mattevi Cet al., 2013, Modeling of the self-limited growth in catalytic chemical vapor deposition of graphene, NEW JOURNAL OF PHYSICS, Vol: 15, ISSN: 1367-2630

JOURNAL ARTICLE

Mattevi C, Colléaux F, Kim H, Chhowalla M, Anthopoulos TDet 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.

JOURNAL ARTICLE

Meca E, Lowengrub J, Kim H, Mattevi C, Shenoy VBet 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

JOURNAL ARTICLE

Pham K-C, Chua DHC, McPhail DS, Wee ATSet 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

CONFERENCE PAPER

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