期刊
ACS NANO
卷 5, 期 12, 页码 9703-9709出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn203879f
关键词
two-dimensional materials; dichalcogenides; MoS2; AFM; mechanical properties
类别
资金
- Swiss National Science Foundation [200021_132102]
- Swiss Nanoscience Institute (NCCR Nanoscience)
- Swiss National Science Foundation (SNF) [200021_132102] Funding Source: Swiss National Science Foundation (SNF)
We report on measurements of the stiffness and breaking strength of monolayer MoS2, a new semiconducting analogue of graphene. Single and bilayer MoS2 is exfoliated from bulk and transferred to a substrate containing an array of microfabricated circular holes. The resulting suspended, free-standing membranes are deformed and eventually broken using an atomic force microscope. We find that the In-plane stiffness of monolayer MoS2 is 180 +/- 60 Nm(-1), corresponding to an effective Young's modulus of 270 +/- 100 GPa, which Is comparable to that of steel. Breaking occurs at an effective strain between 6 and 11% with the average breaking strength of 15 +/- 3 Nm(-1) (23 GPa). The strength of strongest monolayer membranes Is 11% of its Young's modulus, corresponding to the upper theoretical limit which indicates that the material can be highly crystalline and almost defect-free. Our results show that monolayer MoS2 could be suitable for a variety of applications such as reinforcing elements in composites and for fabrication of flexible electronic devices.
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