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Sequential conversion from line defects to atomic clusters in monolayer WS2.

Gyeong Hee Ryu1, Ren-Jie Chan2

  • 1School of Materials Science and Engineering, Gyeongsang National University, Jinju, 52828, Republic of Korea. gh.ryu@gnu.ac.kr.

Applied Microscopy
|February 13, 2021
PubMed
Summary
This summary is machine-generated.

Electron beam irradiation on monolayer tungsten disulfide (WS₂) creates line defects that expand into holes, forming tungsten (W) clusters. This study elucidates the intermediate phase during this hole-formation process.

Keywords:
ADF-STEMClusterHoleLine defectWS2

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Transition metal dichalcogenides (TMDs) are 2D materials prone to atomic vacancies under electron irradiation.
  • Monolayer TMDs like MoS₂ and WS₂ preferentially form sulfur (S) vacancies, leading to line defects.

Purpose of the Study:

  • To investigate the expansion of line defects into holes in monolayer WS₂.
  • To explain the formation mechanism of tungsten (W) clusters at the hole edge.
  • To characterize the intermediate phase during hole formation.

Main Methods:

  • Electron beam irradiation of monolayer WS₂.
  • Annular dark-field scanning transmission electron microscopy (ADF-STEM).
  • Image simulation for atomic structure analysis.

Main Results:

  • Line defects formed by S vacancies expand into holes in WS₂.
  • Tungsten (W) clusters form at the hole periphery.
  • A uniform intermediate phase precedes W cluster formation.

Conclusions:

  • The study details the process of line defect expansion into holes and subsequent W cluster formation in WS₂.
  • The atomic structure of the intermediate phase was confirmed using advanced microscopy and simulation techniques.