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O: Fachverband Oberflächenphysik

O 20: Tribology: Surfaces and Nanostructures

O 20.4: Poster

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

Energy Dissipation Mechanisms in Layered Structures — •Dilek Yildiz, Marcin Kisiel, and Ernst Meyer — Universität Basel

Bodies in relative motion separated by few nanometers gap experiences a tiny friction force. Although nature of non-contact friction is not fully understood yet, it can be measured by highly sensitive cantilever oscillating like a tiny pendulum over the surface. We investigate non-contact friction between Atomic Force Microscope (AFM) tip and the surface of TaS2 and Highly Oriented Pyrolytic Graphite (HOPG) crystals. Both samples are layered crystals with weak interaction between the layers. Yet, the origin of dissipation due to tip - sample interaction is different. While electrostatic type of dissipation is observed to be dominant on TaS2 surface, this type of dissipation is absent on HOPG surface. Interest of this study is to observe frictional response of TaS2 and HOPG to understand the dissipation mechanism in layered structures depending on their surface structures.