Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 12: Nanostructures at Surfaces I
O 12.9: Vortrag
Montag, 17. März 2025, 17:00–17:15, H6
Facilitating On-Surface Synthesis on Inert Surfaces by Using a Noble Gas Atmosphere — •Lukas Grossmann1, Sascha Korn2, Rochus Breuer3, Michael Schmittel3, Heiko Weber2, Wolfgang Heckl1, and Markus Lackinger1 — 1Deutsches Museum, Munich, Germany — 2Friedrich-Alexander University, Erlangen, Germany — 3University of Siegen, Siegen, Germany
A decisive milestone of On-Surface Synthesis (OSS) is the transition from reactive to inert surfaces for the covalent coupling of molecules. This is desirable, because conventionally used metal surfaces strongly interact with organic adsorbates. Thus, adsorption on metals alters the intrinsic properties of the synthesized nanostructures, compromising their applicability. In contrast, inert surfaces leave the adsorbed nanostructures unperturbed. But synthesis is aggravated since activation energies for coupling reactions on inert surfaces are generally higher than on metals. Consequently, reactants desorb before the activation temperature required for their covalent coupling is reached. Here, we explore the OSS of covalent thioether-linked Sierpinski triangles from 1,3,5-tris(4-mercaptophenyl)benzene on inert graphite surfaces. As shown by Scanning Tunneling Microscopy, covalent coupling is feasible by annealing in an argon atmosphere of 1 bar instead of in a vacuum. This protocol kinetically inhibits the premature desorption of reactants, and could be successfully transferred to even more weakly interacting graphene surfaces. The adsorbed Sierpinski triangles exhibit superior thermal stability compared to identical structures on gold and are air stable, underscoring the advantages of inert surfaces.
Keywords: On-Surface Synthesis; Inert Surfaces; Graphite; Graphene; Scanning Tunneling Microscopy