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Journal article
Electronic and optical characterization of 2D Ti2C and Nb2C (MXene) thin films
Journal of physics. Condensed matter, Vol.31(16), pp.165301-165301
24 Apr 2019
PMID: 30669136
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Two-dimensional (2D) transition metal carbides and/or nitrides (MXenes) are a new class of 2D materials, with extensive opportunities for property tailoring due to the numerous possibilities for varying chemistries and surface terminations. Here, Ti2AlC and Nb2AlC MAX phase epitaxial thin films were deposited on sapphire substrates by physical vapor deposition. The films were then etched in LiF/HCl solutions, yielding Li-intercalated, 2D Ti2CTz and Nb2CTz films, whose terminations, transport and optical properties were characterized. The former exhibits metallic conductivity, with weak localization below 50 K. In contrast, the Nb-based film exhibits an increase in resistivity with decreasing temperature from RT down to 40K consistent with variable range hopping transport. The optical properties of both films were determined from spectroscopic ellipsometry in the 0.75 to 3.50 eV range. The results for Ti2Clz films confirm the metallic behavior. In contrast, no evidence of metallic behavior is observed for the Nb2CT(z) film. The present work therefore demonstrates that one fruitful approach to alter the electronic and optical properties of MXenes is to change the nature of the transition metal.
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Details
- Title
- Electronic and optical characterization of 2D Ti2C and Nb2C (MXene) thin films
- Creators
- Joseph Halim - Linköping UniversityIngemar Persson - Linköping UniversityEun Ju Moon - State University of New YorkPhilipp Kuhne - Linköping UniversityVanya Darakchieva - Linköping UniversityPer O. A. Persson - Linkoping Univ, Thin Film Phys Div, Dept Phys Chem & Biol IFM, SE-58183 Linkoping, SwedenPer Eklund - Linköping UniversityJohanna Rosen - Linköping UniversityMichel W. Barsoum - Drexel University
- Publication Details
- Journal of physics. Condensed matter, Vol.31(16), pp.165301-165301
- Publisher
- Iop Publishing Ltd
- Number of pages
- 9
- Grant note
- EM16-0004; FL12-0181; RIF 14-0074; RIF14-055 / Swedish Foundation for Strategic Research (SSF); Swedish Foundation for Strategic Research 2009 00971 / Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) 642-2013-8020; 621-2014-4890; 2016-04412; 2016-00889 / Swedish Research Council; European Commission Knut and Alice Wallenberg (KAW) Foundation; Knut & Alice Wallenberg Foundation
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Identifiers
- 991019167785304721
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- Web of Science research areas
- Physics, Condensed Matter