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Electronic and optical characterization of 2D Ti2C and Nb2C (MXene) thin films
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-7502-1215
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
SUNY Buffalo, NY 14260 USA.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
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2019 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 31, no 16, article id 165301Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 31, no 16, article id 165301
Keywords [en]
MXene; thin films; transport properties; transition metal carbide
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-154975DOI: 10.1088/1361-648X/ab00a2ISI: 000459326900001PubMedID: 30669136OAI: oai:DiVA.org:liu-154975DiVA, id: diva2:1297568
Note

Funding Agencies|Swedish Research Council [642-2013-8020, 621-2014-4890, 2016-04412, 2016-00889]; Knut and Alice Wallenberg (KAW) Foundation; Swedish Foundation for Strategic Research (SSF) [EM16-0004, FL12-0181, RIF 14-0074, RIF14-055]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009 00971]

Available from: 2019-03-20 Created: 2019-03-20 Last updated: 2019-08-29

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