Indirect measurement of the carbon adatom migration barrier on graphene

Andreas Postl (Corresponding author), Pit Pascal Patrick Hilgert, Alexander Markevich, Jacob Madsen, Kimmo Mustonen, Jani Kotakoski, Toma Susi (Corresponding author)

Publications: Contribution to journalArticlePeer Reviewed

Abstract

Although surface diffusion is critical for many physical and chemical processes, including the epitaxial growth of crystals and heterogeneous catalysis, it is particularly challenging to directly study. Here, we estimate the carbon adatom migration barrier on freestanding monolayer graphene by quantifying its temperature-dependent electron knock-on damage. Due to the fast healing of vacancies by diffusing adatoms, the damage rate decreases with increasing temperature. By analyzing the observed damage rates at 300-1073 K using a model describing our finite scanning probe, we find a barrier of (0.33 & PLUSMN; 0.03) eV.

Original languageEnglish
Pages (from-to)596-601
Number of pages6
JournalCarbon
Volume196
Early online date23 May 2022
DOIs
Publication statusPublished - 30 Aug 2022

Austrian Fields of Science 2012

  • 103042 Electron microscopy
  • 103018 Materials physics

Keywords

  • Surface diffusion
  • Graphitic surfaces
  • TEM
  • DFT
  • TRANSITION
  • DIFFUSION
  • GROWTH
  • ATOMS

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