Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 89: Oxide and Insulator Surfaces: Adsorption III
O 89.8: Vortrag
Donnerstag, 23. März 2017, 12:15–12:30, TRE Phy
Self-assembled π- π-stacked triphenylamine derivatives on bulk MgO(001) and KBr(001) — •Tim Sander1, Maximilian Ammon1, Natalie Hammer2, Martin Gurrath3, Bernd Meyer3, Milan Kivala2, and Sabine Maier1 — 1Department of Physics, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany — 2Chair of Organic Chemistry I, Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany — 3Computer-Chemie-Centrum, Friedrich-Alexander University Erlangen-Nürnberg, Germany
Well-ordered molecular self-assemblies on insulating surfaces play a key role towards the controlled formation of organic nanostructures for potential applications in nanoelectronics. On bulk insulators, the subtle influence of the often weak and unspecific molecule-surface interaction on the self-assembly is of high interest.
Here, we discuss molecular self-assemblies of halogen-substituted carbonyl-bridged triphenylamine derivatives on bulk MgO(001) and KBr(001) by means of low temperature non-contact atomic force microscopy (nc-AFM) combined with density functional theory. We observe π-π-stacked structures with comparable adsorption energies on both surfaces. Molecularly resolved nc-AFM images indicate that the intermolecular distances in the triphenylamine structures are similar to the respective lattice spacing underneath. In addition, we find that the growth direction of the π-π-stacked chains is influenced by the choice of the substrate.