Indirect measurement of the carbon adatom migration barrier on graphene. (30th August 2022)

• Record Type: Journal Article
• Authors: Postl, Andreas; Hilgert, Pit Pascal Patrick; Markevich, Alexander; Madsen, Jacob; Mustonen, Kimmo; Kotakoski, Jani; Susi, Toma
• Is Part Of: Carbon. Volume 196(2022)
• Page Start: 596
• Page End: 601
• Publication Date: 2022-08-30
• Subjects: Surface diffusion -- Graphitic surfaces -- TEM -- DFT; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2022.05.039
• Languages: English
• ISSNs: 0008-6223

Abstract

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 ± 0.03) eV. Graphical abstract: Image 1