Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 69: Tribology: Surfaces and Nanostructures (joint session O/CPP)
O 69.2: Talk
Wednesday, March 18, 2020, 15:15–15:30, GER 37
Tuning the friction properties of reconstructed KBr on Ir(111) by intercalating a monolayer of graphene — Zhao Liu1, Antoine Hinaut1, Thilo Glatzel1, Sebastian Scherb1, Junyan Zhang2, and •Ernst Meyer1 — 1Department of Physics, University of Basel, 4056 Basel, Switzerland — 2State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, 730000 Lanzhou, People's Republic of China
The intercalation of graphene and other 2D materials is an effective approach to alter the structures and properties of the top conductive or insulated layers on metal surface [1]. In this work, the growth of KBr islands on Ir(111) is characterized via non-contact atomic force microscopy and friction force microscopy measurement at room temperature in ultrahigh vacuum. We observed the formation of KBr monolayer with highly corrugated superstructure. These superstructures are due to the adaptation of the KBr atoms to the substrate lattice resulting from a tiny misfit of the KBr islands lattice. The superstructure presents a higher friction force of KBr/Ir(111) compared to the bulk KBr(001) as well [2]. We also show the possibility to tune the friction properties of KBr by intercalating a graphene monolayer. Obviously, the reduced friction force is accompanied by the vanishing of the KBr superstructure, with the observation of the common cubic configuration. It gives another view to increase the critical normal load to maintain the superlubric state at the nano scale.
[1] M. Andersen, et al, Phys. Rev. B, 90 (2014) 155428. [2] C. Wieferink, et al, Phys. Rev. B, 83 (2011) 235328.