Please use this identifier to cite or link to this item: doi:10.22028/D291-29276
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Title: Contrast in nanoscale friction between rotational domains of graphene on Pt (111)
Author(s): Chan, Nicholas
Balakrishna, S. G.
Klemenz, Andreas
Moseler, Michael
Egberts, Philip
Bennewitz, Roland
Language: English
Title: Carbon
Volume: 113
Startpage: 132
Endpage: 138
Publisher/Platform: Elsevier
Year of Publication: 2017
Publikation type: Journal Article
Abstract: The nanoscale lubrication properties of graphene depend on chemical functionalization, adsorbants, and bonding to the substrate. The dependence of friction on the rotational orientation of graphene on a Pt(111) surface was studied by high-resolution friction force microscopy in ultra-high vacuum and interpreted through complementary simulations. Lateral forces reveal an atomic-scale stick-slip motion with the periodicity of the graphene structure. Additionally, the lateral forces were modulated by a Moiré pattern, which depends on the rotation of the respective domain. Comparing the experimental results to simulations of the friction process based on the Prandtl-Tomlinson model and to atomistic simulations of the tip-sample interactions, it was found that the modulation of lateral forces originated from a structural mismatch between Pt(111) and graphene domains that were locally pinned to the substrate. Domains with preferred orientations, such as the R1° and the R24°, appeared to exhibit lower average friction than those with orientations less frequently observed, such as the R10° domain.
DOI of the first publication: 10.1016/j.carbon.2016.11.016
Link to this record: hdl:20.500.11880/28083
ISSN: 0008-6223
Date of registration: 14-Oct-2019
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Physik
Professorship: NT - Keiner Professur zugeordnet
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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