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Electromechanical failure of MoS2 nanosheets

Abstract

Molybdenum disulfide (MoS2) has attracted particular attention as promising electronics and optoelectronics due to its fantastic physical properties. In this research, the electromechanical properties of MoS2 nanosheets are systematically investigated with the conductive AFM nanoindentation method. For the suspended MoS2 nanosheets with the thickness of tens of nanometers, they can stay safe under an external applied load (~4.3 μN) until the bias increases to a critical value (+4 V). Small external load (~400 nN) may also lead to a failure when the bias (+7 V) overcomes the contact Schottky barrier and generates a high electric current. The destruction extent of MoS2 nanosheets is related to the external applied load and the bias. Besides, the MoS2 nanosheets suspended on the holes are more apt to be damaged than that supported on the substrate under the same conditions. The volcanic volume expansion profiles of the damaged area after the electromechanical failure are caused by the electric current induced local gradual outside-in heating anodic oxidation and formation of gas bubbles. These experiments have proved that the electric current will promote the mechanical failure of MoS2 nanosheets apparently. The findings above can also provide beneficial guidance for the electromechanical applications of MoS2 nano-devices.

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Publication details

The article was received on 17 Mar 2018, accepted on 08 Jun 2018 and first published on 11 Jun 2018


Article type: Paper
DOI: 10.1039/C8CP01739E
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Electromechanical failure of MoS2 nanosheets

    P. Huang, D. Guo, G. Xie and J. Li, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP01739E

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