Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 20: Tribology: Surfaces and Nanostructures

O 20.1: Poster

Montag, 7. März 2016, 17:00–19:30, Poster A

Preparation of structurally lubricated crystalline Au nanoparticles on HOPG for investigations on the shape and orientation dependence of sliding friction — •Felix Hartmuth, Matthias Vorholzer, Dirk Dietzel und André Schirmeisen — Institute of Applied Physics, Justus Liebig University Giessen, Germany

The widely acknowledged fundamental concept of structural lubricity explains the phenomenon of unusually low friction between two clean, rigid, and atomically flat surfaces with a structural surface mismatch that occurs due to incommensurate lattice parameters with regard to the sliding direction. Recent experiments and theoretical studies on structurally lubricated nanoparticles imply that besides the general lattice structure, the particle shape and orientation are also crucial key factors for the determination of sliding friction [1][2]. Since slightest particle rotation can already influence the interfacial friction, validating these concepts requires well defined nanoparticles and high-precision manipulation schemes. Therefore an improved manipulation procedure that allows in situ switching between FM NC-AFM and contact AFM has been set-up. First results obtained using gold nanoparticles on HOPG show that friction does indeed sensitively depend on the particle orientation. Further analysis will concentrate mainly on the switch in and out of pseudo-commensurate orientations.

[1] Dietzel et al., Phys. Rev. Lett. 111 (2013)

[2] de Wijn et al., Phys. Rev. B 86 (2012)