Indirect measurement of the carbon adatom migration barrier on graphene

Author(s)
Andreas Postl, Pit Pascal Patrick Hilgert, Alexander Markevich, Jacob Madsen, Kimmo Mustonen, Jani Kotakoski, Toma Susi
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.

Organisation(s)
Physics of Nanostructured Materials
Journal
Carbon
Volume
196
Pages
596-601
No. of pages
6
ISSN
0008-6223
DOI
https://doi.org/10.1016/j.carbon.2022.05.039
Publication date
05-2022
Peer reviewed
Yes
Austrian Fields of Science 2012
103042 Electron microscopy, 103018 Materials physics
Keywords
ASJC Scopus subject areas
Chemistry(all), Materials Science(all)
Portal url
https://ucris.univie.ac.at/portal/en/publications/indirect-measurement-of-the-carbon-adatom-migration-barrier-on-graphene(1da76248-0c70-422e-8b61-f6ecf5ad55b6).html