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Chemical Etching of Screw Dislocated Transition Metal Dichalcogenides

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Title
Chemical Etching of Screw Dislocated Transition Metal Dichalcogenides
Author(s)
Zhao, Yuzhou; Xiao Kong; Shearer, Melinda J.; Feng Ding; Jin, Song
Publication Date
2021-09
Journal
Nano Letters, v.21, no.18, pp.7815 - 7822
Publisher
American Chemical Society
Abstract
Chemical etching can create novel structures inaccessible by growth and provide complementary understanding on the growth mechanisms of complex nanostructures. Screw dislocation-driven growth influences the layer stackings of transition metal dichalcogenides (MX2) resulting in complex spiral morphologies. Herein, we experimentally and theoretically study the etching of screw dislocated WS2 and WSe2 nanostructures using H2O2 etchant. The kinetic Wulff constructions and Monte Carlo simulations establish the etching principles of single MX2 layers. Atomic force microscopy characterization reveals diverse etching morphology evolution behaviors around the dislocation cores and along the exterior edges, including triangular, hexagonal, or truncated hexagonal holes and smooth or rough edges. These behaviors are influenced by the edge orientations, layer stackings, and the strain of screw dislocations. Ab initio calculation and kinetic Monte Carlo simulations support the experimental observations and provide further mechanistic insights. This knowledge can help one to understand more complex structures created by screw dislocations through etching.
URI
https://pr.ibs.re.kr/handle/8788114/10553
DOI
10.1021/acs.nanolett.1c02799
ISSN
1530-6984
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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