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Proceedings Paper

Microscopic conductivity and ultrafast carrier dynamics in molybdenum-based MXenes: THz spectroscopy study
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Paper Abstract

MXenes are a new family of two-dimensional transition metal carbides, nitride and carbonitrides with high conductivity and versatile chemical structures. Here we have used THz spectroscopy to study microscopic conductivity and photoinduced carrier dynamics in two Mo-based MXenes, Mo2Ti2C3Tz and Mo2TiC2Tz. Both exhibit high intrinsic carrier densities (~ 1020 cm-3 in Mo2Ti2C3Tz, and ~ 1019 cm-3 in Mo2TiC2Tz), mobilities, and high conductivities within individual nanosheets. We also observe that optical excitation increases their conductivity, unlike Ti3C2Tz, in which photoexcitation suppresses conductivity for nanoseconds. Vacuum annealing improves the long-range transport of photoinduced carriers and further increases their lifetime, as it results in de-intercalation of water and other species from van der Waals gaps between the nanosheets in the films. High and long-lived photoinduced conductivity suggests Mo-based MXenes a promising candidate for optoelectronic, sensing and photoelectrochemical applications.

Paper Details

Date Published: 2 March 2020
PDF: 6 pages
Proc. SPIE 11279, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII, 112791U (2 March 2020); doi: 10.1117/12.2546770
Show Author Affiliations
Guangjiang Li, Worcester Polytechnic Institute (United States)
Varun Natu, Drexel Univ. (United States)
Teng Shi, Worcester Polytechnic Institute (United States)
Michel W. Barsoum, Drexel Univ. (United States)
Lyubov V. Titova, Worcester Polytechnic Institute (United States)


Published in SPIE Proceedings Vol. 11279:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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