Mechanical behavior of single layer MoS2 sheets with aligned defects under uniaxial tension

Compared with a single defect or randomly distributed defects, aligned defects are widely found or artificially designed in structures to realize various functions. However, the mechanical behavior of transition metal dichalcogenides with aligned defects is still unclear, which restricts the bloomin...

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Bibliographic Details
Published in:Journal of applied physics 2021-09, Vol.130 (12)
Main Authors: Han, Yekun, Chen, Peijian, Zhu, Jiaming, Liu, Hao, Zhang, Yingying
Format: Article
Language:English
Subjects:
Applied physics
Blooms (metal)
Crack propagation
Defects
Mechanical properties
Molybdenum disulfide
Nanotechnology devices
Sheets
Tensile strength
Transition metal compounds
Two dimensional materials
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Summary:Compared with a single defect or randomly distributed defects, aligned defects are widely found or artificially designed in structures to realize various functions. However, the mechanical behavior of transition metal dichalcogenides with aligned defects is still unclear, which restricts the blooming application in novel flexible nanodevices. Herein, we report the strength and fracture properties of single layer MoS2 (SLMoS2) sheets with aligned defects under uniaxial tension by numerical calculation and theoretical modeling. It is found that the increase of the number of defects and adjacent spacing leads to the decrease of critical strain as well as tensile strength of both pristine and kirigami MoS2 sheets. Three types of crack propagation phenomena are discovered, and an effective theoretical model is employed to uncover the underlying mechanism of crack deflection phenomenon in SLMoS2 sheets with aligned defects. These results provide important insights into mechanical behavior of SLMoS2 sheets and should be helpful for potential applications of the new two-dimensional material.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0061556