Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Graphene: Growth, Substrate Interaction, Intercalation, and Doping
O 41.1: Vortrag
Mittwoch, 7. September 2022, 10:30–10:45, S052
Stone-Wales defect: molecular model system reveals increased interaction with Cu(111) surface — •Benedikt P. Klein1,2,3, Alexander Ihle4, Stefan R. Kachel1, Lukas Ruppenthal1, Samuel J. Hall2, Daniel Ebeling4, Ralf Tonner-Zech1, Reinhard J. Maurer2, Andre Schirmeisen4, and J. Michael Gottfried1 — 1Philipps-Universität Marburg, Germany — 2University of Warwick, Coventry, UK — 3Diamond Light Source, Didcot, UK — 4Justus-Liebig-Universität Gießen, Germany
The properties of the graphene/metal interface are crucially influenced by the enhanced interaction of defects in the graphene layer with the metal substrate. However, due to experimental and computational constraints, it is difficult to investigate this interaction directly. We combine calculations with experimental analysis of large organic molecules adsorbed on metal surfaces as molecular model systems. We chose two model molecules, azupyrene and pyrene, which have the same aromatic topology as the prototypical Stone-Wales defect and the ideal graphene lattice, respectively. When adsorbed on the Cu(111) surface, we could show using TPD that the model defect binds much stronger to the surface. nc-AFM and NIXSW results furthermore prove a reduction in adsorption height while XPS, UPS, and NEXAFS show an increased electronic hybridisation between molecule and surface. DFT results agree with these findings and show a localized interaction with the metal surface, both for the molecular model systems and the defect embedded into the graphene layer.