Dynamical observations on the crack tip zone and stress corrosion of two-dimensional MoS2

Thuc Hue Ly, Jiong Zhao (), Magdalena Ola Cichocka, Lain-Jong Li and Young Hee Lee ()
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Thuc Hue Ly: IBS Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science, Sungkyunkwan University
Jiong Zhao: IBS Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science, Sungkyunkwan University
Magdalena Ola Cichocka: IBS Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science, Sungkyunkwan University
Lain-Jong Li: Physical Sciences and Engineering, King Abdullah University of Science and Technology
Young Hee Lee: IBS Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science, Sungkyunkwan University

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Whether and how fracture mechanics needs to be modified for small length scales and in systems of reduced dimensionality remains an open debate. Here, employing in situ transmission electron microscopy, atomic structures and dislocation dynamics in the crack tip zone of a propagating crack in two-dimensional (2D) monolayer MoS2 membrane are observed, and atom-to-atom displacement mapping is obtained. The electron beam is used to initiate the crack; during in situ observation of crack propagation the electron beam effect is minimized. The observed high-frequency emission of dislocations is beyond previous understanding of the fracture of brittle MoS2. Strain analysis reveals dislocation emission to be closely associated with the crack propagation path in nanoscale. The critical crack tip plastic zone size of nearly perfect 2D MoS2 is between 2 and 5 nm, although it can grow to 10 nm under corrosive conditions such as ultraviolet light exposure, showing enhanced dislocation activity via defect generation.

Date: 2017
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DOI: 10.1038/ncomms14116

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