Journal article
Two-Dimensional MXenes Mo(2)Ti(2)C(3)Tz and Mo2TiC2Tz: Microscopic Conductivity and Dynamics of Photoexcited Carriers
ACS applied energy materials, v 3(2), pp 1530-1539
01 Feb 2020
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
MXenes are a recently discovered family of two-dimensional transition metal carbides, nitrides, and carbonitrides with electronic properties that can be tuned by their chemistry and structure. Herein THz spectroscopy was used to investigate the microscopic conductivity and photoexcited charge carrier dynamics in two Mo-based MXenes: Mo2Ti2C3Tz and Mo2TiC2Tz. We find that both have high intrinsic carrier densities (similar to 10(20) cm(-3) in Mo2Ti2C3Tz and similar to 10(19) cm(-3) in Mo2TiC2Tz) and mobilities and exhibit high conductivities within individual nanosheets. Optical 'excitations result in a transient conductivity increase in both compositions, in stark contrast with the most studied member of the MXene family, Ti3C2Tz, where photoexcitation suppresses the conductivity for nanoseconds. Deintercalation of water, and other species, from between the nanosheets by mild vacuum annealing at 200 degrees C further improves the long-range, internanosheet transport of the photoexcited carriers and increases their lifetime. High, and long-lived, photoinduced conductivity that can be engineered by substituting Mo for Ti renders these Mo-based MXenes attractive for a variety of optoelectronic, sensing, and photoelectrochemical applications.
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Details
- Title
- Two-Dimensional MXenes Mo(2)Ti(2)C(3)Tz and Mo2TiC2Tz: Microscopic Conductivity and Dynamics of Photoexcited Carriers
- Creators
- Guangjiang Lui - Worcester Polytech Inst, Dept Phys, Worcester, MA 01609 USAVarun Natu - Drexel UniversityTeng Shi - Worcester Polytechnic InstituteMichel W. Barsoum - Drexel UniversityLyubov Titova - Worcester Polytechnic Institute
- Publication Details
- ACS applied energy materials, v 3(2), pp 1530-1539
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 19
- Grant note
- DMR 1740795 / NSF; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000516665300033
- Scopus ID
- 2-s2.0-85079006323
- Other Identifier
- 991019168102604721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical
- Energy & Fuels
- Materials Science, Multidisciplinary