Conference proceeding
Microscopic conductivity and ultrafast carrier dynamics in molybdenum-based MXenes: THz spectroscopy study
TERAHERTZ, RF, MILLIMETER, AND SUBMILLIMETER-WAVE TECHNOLOGY AND APPLICATIONS XIII, 2020, v 11279, pp 112791U-112791U-6
01 Jan 2020
Featured in Collection : UN Sustainable Development Goals @ Drexel
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, Mo(2)Ti(2)C(3)Tz and Mo(2)TiC(2)Tz. Both exhibit high intrinsic carrier densities (similar to 10(20) cm(-3) in Mo(2)Ti(2)C(3)Tz, and similar to 10(19) cm(-3) in Mo(2)TiC(2)Tz), mobilities, and high conductivities within individual nanosheets. We also observe that optical excitation increases their conductivity, unlike Ti(3)C(2)Tz, 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.
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Details
- Title
- Microscopic conductivity and ultrafast carrier dynamics in molybdenum-based MXenes: THz spectroscopy study
- Creators
- Guangjiang Li - Worcester Polytechnic InstituteVarun Natu - Drexel UniversityTeng Shi - Worcester Polytechnic InstituteMichel W. Barsoum - Drexel UniversityLyubov Titova - Worcester Polytechnic Institute
- Contributors
- L P Sadwick (Editor)T Yang (Editor)
- Publication Details
- TERAHERTZ, RF, MILLIMETER, AND SUBMILLIMETER-WAVE TECHNOLOGY AND APPLICATIONS XIII, 2020, v 11279, pp 112791U-112791U-6
- Series
- Proceedings of SPIE
- Publisher
- Spie-Int Soc Optical Engineering
- Number of pages
- 6
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000576674300027
- Scopus ID
- 2-s2.0-85083760319
- Other Identifier
- 991019167930904721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Optics
- Physics, Applied