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O: Fachverband Oberflächenphysik
O 4: Tribology: Surfaces and Nanostructures
O 4.3: Talk
Monday, March 27, 2023, 11:00–11:15, GER 37
Kinetic nanoscale friction on van der Waals heterostructures — •Bartosz Szczefanowicz1, Zhao Liu1, Joao Marcelo J. Lopes2, Antony George3, Ziyang Gan3, Andrey Turchanin3, Alexander Rothstein4, Christoph Stampfer4, and Roland Bennewitz1 — 1INM - Leibniz Institute for New Materials, Saarbrücken, Germany — 2Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Berlin, Germany — 3Friedrich Schiller University Jena, Institute of Physical Chemistry, Jena, Germany — 4JARA-FIT and 2nd Institute of Physics A, RWTH Aachen University, 52074 Aachen, Germany
2D materials exhibit exceptional tribological properties due to their weak normal-to-plane interactions. Friction Force Microscopy (FFM) demonstrated that the microscopic processes underlying friction can be tuned by application of high contact pressure [1] or by combining different 2D materials into van der Waals heterostructures [2].
Samples of MoSe2/hBN and graphene/hBN were prepared by the exfoliation technique. Sample of MoS2/graphene was produced by thermal decomposition of SiC(0001), followed by direct growth of MoS2 by Chemical Vapor Deposition (CVD). Friction forces were measured on those heterostructures in FFM experiments in ultrahigh vacuum as function of normal load and electric bias. We will discuss the results in terms of atomic potential corrugation, bending rigidity of 2D heterostructures, and bias-induced electrostatic attraction.
[1] T. Filleter, and R. Bennewitz, Phys. Rev. B, 81, 2010, 155412
[2] M. R. Vazirisereshk, et al., Nano Lett., 19, 2019, 5496-5505