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Probing Atomic-Scale Fracture of Grain Boundaries in Low-symmetry 2D Materials

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Title
Probing Atomic-Scale Fracture of Grain Boundaries in Low-symmetry 2D Materials
Author(s)
Zhang, Hui; Yu, Yue; Xinyue Dai; Yu, Jinshan; Xu, Hua; Wang, Shanshan; Feng Ding; Zhang, Jin
Publication Date
2021-12
Journal
Small, v.17, no.51
Publisher
John Wiley and Sons Inc
Abstract
© 2021 Wiley-VCH GmbH Grain boundaries (GBs) play a central role in the fracture of polycrystals. However, the complexity of GBs and the difficulty in monitoring the atomic structure evolution during fracture greatly limit the understanding of the GB mechanics. Here, in situ aberration-corrected scanning transmission electron microscopy and density functional theory calculations are combined to investigate the fracture mechanics in low-symmetry, polycrystalline, 2D rhenium disulfide (ReS2), unveiling the distinctive crack behaviors at different GBs with atomic resolution. Brittle intergranular fracture prefers to rip through the GBs that are parallel to the Re chains of at least one side of the GBs. In contrast, those GBs, which do not align with Re chains on either side of the GBs, are highly resistant to fracture, impeding or deflecting the crack propagation. These results disclose the GB type-dependent mechanical failure of anisotropic 2D polycrystals, providing new ideas for material reinforcement and controllable cutting via GB engineering.
URI
https://pr.ibs.re.kr/handle/8788114/11006
DOI
10.1002/smll.202102739
ISSN
1613-6810
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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