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Electronic and optical characterization of 2D Ti2C and Nb2C (MXene) thin films
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0002-7502-1215
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
SUNY Buffalo, NY 14260 USA.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Halvledarmaterial. Linköpings universitet, Tekniska fakulteten.
Vise andre og tillknytning
2019 (engelsk)Inngår i: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 31, nr 16, artikkel-id 165301Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
IOP PUBLISHING LTD , 2019. Vol. 31, nr 16, artikkel-id 165301
Emneord [en]
MXene; thin films; transport properties; transition metal carbide
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Identifikatorer
URN: urn:nbn:se:liu:diva-154975DOI: 10.1088/1361-648X/ab00a2ISI: 000459326900001PubMedID: 30669136OAI: oai:DiVA.org:liu-154975DiVA, id: diva2:1297568
Merknad

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]

Tilgjengelig fra: 2019-03-20 Laget: 2019-03-20 Sist oppdatert: 2019-08-29

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