Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 95: Novel Functional Materials II
HL 95.5: Vortrag
Freitag, 11. März 2016, 11:15–11:30, H10
Electronic properties of freestanding Ti3C2Tx MXene monolayers — •Alessio Miranda1, Joseph Halim2, Michel W. Barsoum2, and Axel Lorke1 — 1Dep. of Physics, Uni. Duisburg-Essen, Duisburg, 47058, Germany — 2Dep. of Materials Science and Engineering, Drexel University , Philadelphia, PA19104, USA
Recently, MXenes, 2D early transition metal carbides and carbonitrides, have been produced by the selective etching of A from the MAX phases. The latter are a large family of compounds, with the general formula Mn+1AXn (n = 1-3), where M is an early transition metal, A is an A-group element, and X represents C or N [1]. During the etching process, the MXene surface acquires terminating functional groups, T, (namely -O, -OH, and/or -F), which can have significant effects on the work function and electrical properties of these new compounds. Here we report, on the electrical properties of Ti3C2Tix freestanding MXene monolayers in the 2.5 K to 300 K temperature range [2]. We show that Ti3C2Tix samples exhibit metallic behavior, they have a carrier density of 5 × 1014 cm−2, which is relatively high and can be modulated by the application of a gate voltage. MXenes, which have already been demonstrated to be promising candidates for a variety of applications [3], may also be interesting for electronic applications, such as field-effect devices. Magnetotransport measurements are also reported.
[1] M. W. Barsoum, MAX Phases: Properties of Machinable Ternary Carbides and Nitrides (Wiley-VCH, 2013). [2] A. Miranda, et al. submitted (2015). [3] M. Naguib, et al Adv. Mater. 26, 992-1005 (2014).