SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 4: Tribology: Surfaces and Nanostructures
O 4.5: Vortrag
Montag, 27. März 2023, 11:30–11:45, GER 37
Rewritable friction on Nitrogen-doped graphene moiré superstructures — •Shuyu Huang1,2, Antoine Hinaut2, Yiming Song2, Sebastian Scherb2, Gema Gnavarro2, Thilo Glatzel2, Yunfei Chen1, and Ernst Meyer2 — 1Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189, China — 2Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
Graphene, as typical atomically-thin solid lubricant with potential applications in micro- and nano-electromechanical systems (MEMS/NEMS), has been extensively investigated on its nanotribological properties. In the present work, we compare the frictional properties between pristine graphene and modified graphene, showing that atomic-scale friction can be significantly altered by Nitrogen doping-induced modification, then it can be recovered after tip rubbing. Specifically, C60 nano-flakes are deposited as a mask on graphene/Ir (111) surface by thermal evaporation. The sample is then exposed to a nitrogen radical flux produced by a remote RF plasma source. After thermal annealing, to desorb C60 molecules, both nano-patterned modified graphene and pristine graphene, located below former C60 islands, surface is obtained simultaneously. By the means of high-resolution ultrahigh vacuum atomic force microscopy, the topography of surface with two different regions are characterized and discussed in non-contact mode and friction force variation is measured in contact mode.