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Velocity Dependence of Moiré Friction

Song, Yiming and Gao, Xiang and Hinaut, Antoine and Scherb, Sebastian and Huang, Shuyu and Glatzel, Thilo and Hod, Oded and Urbakh, Michael and Meyer, Ernst. (2022) Velocity Dependence of Moiré Friction. Nano Letters, 22 (23). pp. 9529-9536.

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Official URL: https://edoc.unibas.ch/92372/

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Abstract

Friction force microscopy experiments on moiré superstructures of graphene-coated platinum surfaces demonstrate that in addition to atomic stick–slip dynamics, a new dominant energy dissipation route emerges. The underlying mechanism, revealed by atomistic molecular dynamics simulations, is related to moiré ridge elastic deformations and subsequent relaxation due to the action of the pushing tip. The measured frictional velocity dependence displays two distinct regimes: (i) at low velocities, the friction force is small and nearly constant; and (ii) above some threshold, friction increases logarithmically with velocity. The threshold velocity, separating the two frictional regimes, decreases with increasing normal load and moiré superstructure period. Based on the measurements and simulation results, a phenomenological model is derived, allowing us to calculate friction under a wide range of room temperature experimental conditions (sliding velocities of 1–104 nm/s and a broad range of normal loads) and providing excellent agreement with experimental observations.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Glatzel, Thilo and Meyer, Ernst and Hinaut, Antoine
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
ISSN:1530-6984
e-ISSN:1530-6992
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Language:English
Identification Number:
edoc DOI:
Last Modified:30 Nov 2023 02:30
Deposited On:09 Feb 2023 07:58

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