Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 5: Nanostructures at Surfaces I: Organics
O 5.8: Vortrag
Montag, 1. April 2019, 12:15–12:30, H15
Self-assembly of para-hexaphenyl-dicarbonitrile on graphene — Nico Schmidt1, Jun Li1, •Ida Delac Marion1, Mihaela Enache1, Stefano Gottardi1, Brian Baker1, Leonid Solianyk1, Juan-Carlos Moreno-Lopez1, Leticia Monjas Gomez2, Anna Hirsch2, and Meike Stöhr1 — 1Zernike Institute for Advanced Materials, University of Groningen, Groningen, the Netherlands — 2Stratingh Institute for Chemistry, University of Groningen, Groningen, the Netherlands
We report on the self-assembly of para-hexaphenyl-dicarbonitrile (NC-Ph6-CN) on epitaxial graphene on Cu(111) and Ir(111) as well as on highly oriented pyrolytic graphite (HOPG). Structural and electronic properties of the obtained assemblies were studied using STM, STS, and LEED. For NC-Ph6-CN on graphene on both metallic substrates we found two related close-packed structures for which parallel molecules aligned in rows with a peculiar shift every fourth or fifth molecule, while for HOPG only one close-packed structure was observed. Hitherto the observed shift is a unique feature of NC-Ph6-CN on graphitic substrates and already one layer of graphene is sufficient to induce it. Furthermore, we studied the formation of 1D and 2D metal-organic coordination (MOC) structures of NC-Ph6-CN and Cu atoms on graphene on Ir(111). The dimensionality of the MOC structures was tuned by varying the stoichiometry between the NC-Ph6-CN molecules and Cu atoms: for a 1:1 ratio, 1D chains based on two-fold Cu-coordination were formed, while for a 3:2 ratio, a 2D hexagonal porous network based on three-fold Cu-coordination was obtained.