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Evolution of defect formation during atomically precise desulfurization of monolayer MoS2

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Title
Evolution of defect formation during atomically precise desulfurization of monolayer MoS2
Author(s)
Jong-Young Lee; Jong Hun Kim; Yeonjoon Jung; June Chul Shin; Yangjin Lee; Namwon Kim; Namwon Kim; Arend M. van der Zande; Jangyup Son; Gwan-Hyoung Lee
Publication Date
2021-07
Journal
Communications Materials, v.2, no.1
Publisher
Springer Nature
Abstract
Structural symmetry-breaking is a key strategy to modify the physical and chemical properties of two-dimensional transition metal dichalcogenides. However, little is known about defect formation during this process. Here, with atomic-scale microscopy, we investigate the evolution of defect formation in monolayer MoS2 exposed indirectly to hydrogen plasma. At the beginning of the treatment only top-layer sulfur atoms are removed, while vacancies and the molybdenum atomic layer are maintained. As processing continues, hexagonal-shaped nanocracks are generated along the zigzag edge during relaxation of defect-induced strain. As defect density increases, both photoluminescence and conductivity of MoS2 gradually decreases. Furthermore, MoS2 showed increased friction by 50% due to defect-induced contact stiffness. Our study reveals the details of defect formation during the desulfurization of MoS2 and helps to design the symmetry-breaking transition metal dichalcogenides, which is of relevance for applications including photocatalyst for water splitting, and Janus heterostructures. © 2021, The Author(s).
URI
https://pr.ibs.re.kr/handle/8788114/11756
DOI
10.1038/s43246-021-00185-4
ISSN
2662-4443
Appears in Collections:
Center for Nanomedicine (나노의학 연구단) > 1. Journal Papers (저널논문)
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