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Issue 15, 2016
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Single- and few-layer WTe2 and their suspended nanostructures: Raman signatures and nanomechanical resonances

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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.

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

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Publication details

The article was received on 19 Jan 2016, accepted on 16 Mar 2016 and first published on 16 Mar 2016


Article type: Communication
DOI: 10.1039/C6NR00492J
Citation: Nanoscale, 2016,8, 7854-7860
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    Single- and few-layer WTe2 and their suspended nanostructures: Raman signatures and nanomechanical resonances

    J. Lee, F. Ye, Z. Wang, R. Yang, J. Hu, Z. Mao, J. Wei and P. X.-L. Feng, Nanoscale, 2016, 8, 7854
    DOI: 10.1039/C6NR00492J

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