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|Title:||Contrast in nanoscale friction between rotational domains of graphene on Pt (111)|
Balakrishna, S. G.
|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|
|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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