期刊
NANO LETTERS
卷 16, 期 9, 页码 5394-5400出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b01598
关键词
Black phosphorus; mechanical anisotropy; multimode resonances; spatial mapping; 2D materials; nanoelectromechanical systems (NEMS)
类别
资金
- Case School of Engineering
- National Academy of Engineering (NAE) Grainger Foundation Frontier of Engineering (FOE) Award [FOE2013-005]
- National Science Foundation (ECCS) [1454570]
- CSC Fellowship [201306250042, 2011625071]
- CWRU Provost's ACES+ Advance Opportunity Award
- National Science Foundation [ECCS-0335765]
- National Natural Science Foundation of China
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1454570] Funding Source: National Science Foundation
Black phosphorus (P) has emerged as a layered semiconductor with a unique crystal structure featuring corrugated atomic layers and strong in-plane anisotropy in its physical properties. Here, we demonstrate that the crystal orientation and mechanical anisotropy in free-standing black P thin layers can be precisely determined by spatially resolved multimode nanomechanical resonances. This offers a new means for resolving important crystal orientation and anisotropy in black P device platforms in situ beyond conventional optical and electrical calibration techniques. Furthermore, we show that electrostatic-gating-induced straining can continuously tune the mechanical anisotropic effects on multimode resonances in black P electromechanical devices Combined with finite element modeling (FEM), we also determine the Young's moduli of multilayer black P to be 116.1 and 46.5 GPa in the zigzag and armchair directions, respectively.
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