Direct Visualization of Large‐Scale Intrinsic Atomic Lattice Structure and Its Collective Anisotropy in Air‐Sensitive Monolayer 1T’‐ WTe2
Autor: | Junhao Lin, Gang Wang, Songge Li, Mengjiao Han, Mouyi Weng, Zenglong Guo, Feng Pan, Kangdi Niu |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Materials science
Condensed matter physics Science General Chemical Engineering General Engineering General Physics and Astronomy Medicine (miscellaneous) air‐sensitive 2D materials Crystal structure Biochemistry Genetics and Molecular Biology (miscellaneous) anisotropic ripple large‐scale atomic mapping Lattice (module) Rippling Vacancy defect Te vacancy Scanning transmission electron microscopy Monolayer General Materials Science Density functional theory WTe2 monolayer Anisotropy Research Articles Research Article |
Zdroj: | Advanced Science Advanced Science, Vol 8, Iss 20, Pp n/a-n/a (2021) |
ISSN: | 2198-3844 |
Popis: | Probing large‐scale intrinsic structure of air‐sensitive 2D materials with atomic resolution is so far challenging due to their rapid oxidization and contamination. Here, by keeping the whole experiment including growth, transfer, and characterizations in an interconnected atmosphere‐control environment, the large‐scale intact lattice structure of air‐sensitive monolayer 1T’‐WTe2 is directly visualized by atom‐resolved scanning transmission electron microscopy. Benefit from the large‐scale atomic mapping, collective lattice distortions are further unveiled due to the presence of anisotropic rippling, which propagates perpendicular to only one of the preferential lattice planes in the same WTe2 monolayer. Such anisotropic lattice rippling modulates the intrinsic point defect (Te vacancy) distribution, in which they aggregate at the constrictive inner side of the undulating structure, presumably due to the ripple‐induced asymmetric strain as elaborated by density functional theory. The results pave the way for atomic characterizations and defect engineering of air‐sensitive 2D layered materials. The large‐scale intrinsic lattice structure of air‐sensitive 1T’‐WTe2 monolayer is directly revealed by atomic scanning transmission electron microscopy imaging with dedicated sample protection. The collective thermal equilibrium lattice distortion, i.e., rippling, is found to be anisotropic and propagate only perpendicular to one of the preferential lattice planes, completely different than monolayer graphene and MoS2 with hexagonal symmetry. |
Databáze: | OpenAIRE |
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