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Transparent Conductive Two-Dimensional Titanium Carbide Epitaxial Thin Films.


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. To date MXenes have been produced as powders, flakes, and colloidal solutions. Herein, we report on the fabrication of ∼1 × 1 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.

SUBMITTER: Halim J 

PROVIDER: S-EPMC3982936 | biostudies-literature | 2014 Apr

REPOSITORIES: biostudies-literature

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Transparent Conductive Two-Dimensional Titanium Carbide Epitaxial Thin Films.

Halim Joseph J   Lukatskaya Maria R MR   Cook Kevin M KM   Lu Jun J   Smith Cole R CR   Näslund Lars-Åke LA   May Steven J SJ   Hultman Lars L   Gogotsi Yury Y   Eklund Per P   Barsoum Michel W MW  

Chemistry of materials : a publication of the American Chemical Society 20140228 7


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. To date MXenes have been produced as powders, flakes, and colloidal solutions. Herein, we report on the fabrication of ∼1 × 1 cm<sup>2</sup> Ti<sub>3</sub>C<sub>2</sub> films by selective etching of Al, from sputter-deposited epitaxia  ...[more]

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