Elasticity of MoS2 Sheets by Mechanical Deformation Observed by in Situ Electron Microscopy

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• 作者：Gilberto Casillas ; Ulises Santiago ; H茅ctor Barr贸n ; Diego Alducin ; Arturo Ponce ; Miguel Jos茅-Yacam谩n
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：January 8, 2015
• 年：2015
• 卷：119
• 期：1
• 页码：710-715
• 全文大小：388K
• ISSN：1932-7455

文摘

MoS₂ has been the focus of extensive research due to its potential applications. More recently, the mechanical properties of MoS₂ layers have raised interest due to applications in flexible electronics. In this article, we show in situ transmission electron microcsopy (TEM) observation of the mechanical response of a few layers of MoS₂ to an external load. We used a scanning tunneling microscope (STM) tip mounted on a TEM stage to induce deformation on nanosheets of MoS₂ containing few layers. The results confirm the outstanding mechanical properties on the MoS₂. The layers can be bent close to 180掳. However, when the tip is retrieved the initial structure is recovered. Evidence indicates that there is a significant bond reconstruction during the bending with an outstanding capability to recover the initial bond structure. The results show that flexibility of three layers of MoS₂ remains the same as a single layer while increasing the bending modulus by 3 orders of magnitude. Our findings are consistent with theoretical calculations and confirm the great potential of MoS₂ for applications.