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Nanoscale friction on MoS2/graphene heterostructures

  • Stacked hetero-structures of two-dimensional materials allow for a design of interactions with corresponding electronic and mechanical properties. We report structure, work function, and frictional properties of 1 to 4 layers of MoS2 grown by chemical vapor deposition on epitaxial graphene on SiC(0001). Experiments were performed by atomic force microscopy in ultra-high vacuum. Friction is dominated by adhesion which is mediated by a deformation of the layers to adapt the shape of the tip apex. Friction decreases with increasing number of MoS2 layers as the bending rigidity leads to less deformation. The dependence of friction on applied load and bias voltage can be attributed to variations in the atomic potential corrugation of the interface, which is enhanced by both load and applied bias. Minimal friction is obtained when work function differences are compensated.

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Document Type:Article
Author:Zhao LiuORCiD, Bartosz H. SzczefanowiczORCiD, J. Marcelo J. Lopes, Ziyang Gan, Antony George, Andrey TurchaninORCiD, Roland BennewitzORCiD
Parent Title (English):Nanoscale
First Page:5809
Last Page:5814
Year of first Publication:2023
Release Date:2023/03/27
Impact:08.307 (2021)
Funding Information:Deutsche Forschungsgemeinschaft within the Priority Program SPP 2244 ‘2DMP’
Scientific Units:Interactive Surfaces
DDC classes:500 Naturwissenschaften und Mathematik / 540 Chemie
Open Access:Open Access
Signature:INM 2023/031
Licence (German):License LogoCreative Commons - CC BY-NC - Namensnennung - Nicht kommerziell 4.0 International