Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 22: Poster Monday: Surface Structure, Epitaxy, Growth and Tribology
O 22.6: Poster
Montag, 5. September 2022, 18:00–20:00, P4
Nanotribological properties of Nitrogen doping-induced modification graphene in ultrahigh vacuum — •Shuyu Huang1,2, Antoine Hinaut1, Yiming Song1, Sebastian Scherb1, Gema Gnavarro1, Thilo Glatzel1, and Ernst Meyer1 — 1Department of Physics, University of Basel, 4056 Basel, Switzerland — 2Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189, China
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, by using a novel experimental approach, for the first time we directly compare the frictional properties between pristine graphene and modified graphene on a single image, showing that atomic-scale friction can be significantly altered by Nitrogen doping-induced modification. 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.