Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 20: Inorganic/Organic Interfaces: Growth III
O 20.4: Vortrag
Dienstag, 17. März 2015, 11:15–11:30, MA 005
Tuning the self-assembly of triarylamine derivatives on KBr(001) — •Christian Steiner1, Tim Sander1, Maximilian Ammon1, Natalie Hammer2, Bettina Gliemann2, Ute Meinhardt2, Milan Kivala2, and Sabine Maier1 — 1Department of Physics, FAU Erlangen-Nürnberg, Germany — 2Department of Chemistry and Pharmacy, FAU Erlangen-Nürnberg, Germany
Electrically insulating surfaces generally have a lower surface energy than their metallic counterparts. As a consequence organic molecules without a specific bonding motif often lack sufficient interactions with the insulating surface, and tend to dewet or form unordered clusters along step edges.
Here, we present a low temperature non-contact AFM study on the adsorption geometry of hydrogen-bonding and halogen functionalized triarylamines on KBr(001). Dimethyl bridged triarylamines adopt a flat-lying adsorption geometry. The structure of the hydrogen-bonding networks is influenced by the underlying lattice geometry. In contrast, the more compact carbonyl bridged triarylamines favour an intermolecular π-π interaction, which leads to a nearly upright adsorption geometry. The nearly upright molecules form linear aggregates along the [110]-direction. These results show that the adsorption geometry of triarylamines can be tuned by a suitable choice of functional groups, and that the molecule-surface interaction is not neglectable on KBr(001).