Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 9: Nanotribology
O 9.5: Talk
Monday, March 11, 2013, 11:30–11:45, H42
Friction and atomic-scale wear of graphitic lubricants on SiC(0001) in dry sliding — •Felix Wählisch1, Judith Hoth1, Christian Held1, Thomas Seyller2, and Roland Bennewitz1 — 1INM Leibniz-Institute for New Materials and Experimental Physics, Saarland University, Campus D2 2, 66123 Saarbrücken, Germany — 2Technische Universität Chemnitz, Institut für Physik, Technische Physik, Reichenhainer Straße 70, 09126 Chemnitz, Germany
Sliding friction experiments on graphene grown on SiC(0001) have been performed using a combination of a microtribometer with an atomic force microscope (AFM) allowing for the investigation of atomic-scale wear. The graphene layer delaminates within ten sliding cycles starting from substrate step edges. After run in, friction is dominated by the interaction between a changing configuration of asperities at the probe sphere and a graphitic interface layer terminating the SiC substrate. Friction varies unpredictably due to changes in the contact configuration. However, the linear relation between friction and contact area can be confirmed and a shear strength as low as a few MPa is found for the contact between ruby and the graphitic layer on SiC, which remains intact under continuous sliding.