Single- and few-layer WTe2 and their suspended nanostructures: Raman signatures and nanomechanical resonances

Jaesung Lee, Fan Ye, Zenghui Wang, Rui Yang, Jin Hu, Zhiqiang Mao, Jiang Wei, Philip X.L. Feng

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

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 EY ≈ 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.

Original languageEnglish (US)
Pages (from-to)7854-7860
Number of pages7
JournalNanoscale
Volume8
Issue number15
DOIs
StatePublished - Apr 21 2016

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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