Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 34: New Methods and Developments III: Spectroscopy and Tribology
O 34.1: Talk
Tuesday, April 2, 2019, 14:00–14:15, H13
Atomic Scale Structure and Frictional Response of Swift Heavy Ion Irradiation Induced Defects on Graphitic Surfaces — •Dilek Yildiz1,2, Cem Kincal1, Umut Kamber1, Cornelis J. van der Beek3, and Oguzhan Gürlü1 — 1Istanbul Technical University, Department of Physics, 34460, Istanbul, Turkey — 2University of Basel, Department of Physics, Basel, Switzerland — 3Ecole Polytechnique, Palaiseau, France
Hillock and comet-like structures on swift heavy ion (SHI) irradiated highly oriented pyrolytic graphite (HOPG) surfaces were previously reported. It was shown that chains of hillocks were formed on HOPG due to SHI irradiation under grazing incidence. Using Scanning Tunneling Microscopy (STM) we have obtained atomic resolution on the tail sections of the comets as well as on the chains forming around them. Such data indicates that the interaction of SHI with the bulk of HOPG damages the atomic order on the surface layer only locally. SHI irradiation induced corrugation changes on flat surfaces can be imaged by STM to a certain extent. Friction force microscopy showed complementary results. We have observed that the tail sections of the comets appeared on friction maps, although they could not be seen in simultaneously taken contact mode AFM topography images. Our data on SHI irradiation of moire zones that formed due to rotated graphene layers on HOPG surfaces indicate that the structure of the SHI induced defects on graphene/HOPG system varies due to local conductivity differences between moire zones.