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Ding, Feng
IBS - Center for Multidimensional Carbon Materials (CMCM)
Research Interests
  • Theoretical methods development for materials studies.
  • The formation mechanism of various carbon materials, from fullerene to carbon nanotube and graphene.
  • Kinetics and thermodynamics of materials growth and etching.
  • The structure, properties and fundamentals of nanomaterials.
  • The experimental synthesis of carbon nanotubes.

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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
Zhao, YuzhouKong, XiaoShearer, Melinda J.Ding, FengJin, Song
Issue Date
2021-09
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.21, no.18, pp.7815 - 7822
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://scholarworks.unist.ac.kr/handle/201301/54765
URL
https://pubs.acs.org/doi/10.1021/acs.nanolett.1c02799
DOI
10.1021/acs.nanolett.1c02799
ISSN
1530-6984
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