期刊
NANOSCALE
卷 8, 期 15, 页码 7854-7860出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr00492j
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资金
- Case School of Engineering, National Academy of Engineering (NAE) Grainger Foundation Frontier of Engineering (FOE) Award [FOE2013-005]
- National Science Foundation CAREER [ECCS-1454570]
- CWRU Provost's ACES+ Advance Opportunity Award
- National Science Foundation [ECCS-0335765]
- DOE [DE-SC0014208]
- Louisiana Board of Regents [LEQSF (2015-18)-RD-A-23]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1454570] Funding Source: National Science Foundation
Single crystal tungsten ditelluride (WTe2) has recently been discovered to exhibit non-saturating extreme magnetoresistance in bulk; it has also emerged as a new layered material from which atomic layer crystals can be extracted. While atomically thin WTe2 is attractive for its unique properties, little research has been conducted on single-and few-layer WTe2. Here we report the isolation of single-and few-layer WTe2, as well as the fabrication and characterization of the first WTe2 suspended nanostructures. We have observed new Raman signatures of single-and few-layer WTe2 that have been theoretically predicted but have not been reported to date, in both on-substrate and suspended WTe2 flakes. We have further probed the nanomechanical properties of suspended WTe2 structures by measuring their flexural resonances, and obtain a Young's modulus of E-Y approximate to 80 GPa for the suspended WTe2 flakes. This study paves the way for future investigations and utilizations of the multiple new Raman fingerprints of single-and few-layer WTe2, and for explorations of mechanical control of WTe2 atomic layers.
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