Transparent Conductive Two-Dimensional Titanium Carbide Epitaxial Thin Films

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Since the discovery of graphene, the quest for two-dimensional (2D) materials has intensified greatly

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Transparent Conductive Two-Dimensional Titanium Carbide Epitaxial Thin Films

Joseph Halim§, Maria R. Lukatskaya, Kevin M. Cook, Jun Lu§, Cole R. Smith, Lars-Åke Näslund§, Steven J. May, Lars Hultman§, Yury Gogotsi*, Per Eklund*§, and Michel W. Barsoum*§
Department of Materials Science & Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
A.J. Drexel Nanomaterials Institute, Drexel University, Philadelphia, Pennsylvania 19104, United States
§ Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83, Linköping, Sweden
Chem. Mater., 2014, 26 (7), pp 2374–2381
DOI: 10.1021/cm500641a
Publication Date (Web): February 28, 2014
Copyright © 2014 American Chemical Society

Abstract

Since the discovery of graphene, the quest for two-dimensional (2D) materials has intensified greatly. Recently, a new family of 2D transition metal carbides and carbonitrides (MXenes) was discovered that is both conducting and hydrophilic, an uncommon combination. MXenes were produced as powders, flakes and colloidal solutions. Herein, we report on the fabrication of ~ 1x1 cm2 Ti3C2 films by selective etching of Al, from sputter-deposited epitaxial Ti3AlC2 films, in aqueous HF or NH4HF2. Films that were about 19 nm thick, etched with NH4HF2, transmit ~ 90% of the light in the visible-to-infrared range and exhibit metallic conductivity down to ~100 K. Below 100 K, the films’ resistivity increases with decreasing temperature and they exhibit negative magnetoresistance; both observations consistent with a weak localization phenomenon characteristic of many 2D defective solids. This advance opens the door for the use of MXenes in electronic, photonic and sensing applications.

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Source: http://pubs.acs.org/doi/full/10.1021/cm500641a

 

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