Line-defect mediated formation of hole and Mo clusters in monolayer molybdenum disulfide

Gyeong Hee Ryu, Jongyeong Lee, Na Yeon Kim, Yeongdong Lee, Youngchan Kim, Moon J. Kim, Changgu Lee, Zonghoon Lee

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The production of hole and Mocluster by electron beam irradiation in molybdenum disulfide (MoS2), which consists of S-Mo-S layers, is monitored over time using atomic resolution transmission electron microscopy. S vacancies are firstly formed due to knocking off of S atoms and then line defects are induced due to accumulation of S vacancies in MoS2 sheet instead of forming a hole. The line defects tend to be merged at a point and a hole is formed subsequently at the point.Moatoms tend to be clustered discretely as a nano sheet along the edge of the hole due to difference in displacement threshold energy betweenMoand S atoms under electron irradiation. AfterMoclusters are nearly separated from MoS2 sheet, the clusters are transformed into body-centered cubic nanocrystal of Mo during prolonged electron beam irradiation. The line defect mediated formation of hole and Mo cluster only occurs within a single grain of monolayer MoS2 sheet.

Original languageEnglish
Article number014002
Journal2D Materials
Volume3
Issue number1
DOIs
StatePublished - Jan 18 2016
Externally publishedYes

Keywords

  • Atomic resolution transmission electron microscopy
  • Electron beam irradiation
  • Mo cluster
  • MoS
  • Transformation

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