Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Oxide and Insulator Surfaces II
O 58.12: Vortrag
Mittwoch, 2. April 2014, 18:45–19:00, PHY C 213
Directed growth of functionalized triarylamines on KBr(001) — Christian Steiner1, Natalie Hammer2, Ute Meinhardt2, Bettina Gliemann2, Milan Kivala2, and •Sabine Maier1 — 1Department of Physics, University of Erlangen-Nürnberg, Germany — 2Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Germany
The growth and imaging of well-ordered molecular self-assemblies is often challenging on bulk insulating surfaces owing to the low molecule-surface interaction. However, organic layers on insulating compared to metallic materials are more likely to be relevant for applications, e.g. in electronic devices such as organic field effect transistors. We investigated the self-assembly of triarylamine derivatives on an insulating KBr(001) surface using non-contact atomic force microscopy in ultra high vacuum at low temperature. By carefully balancing the molecule-surface interaction and molecule-molecule interaction using similar triarylamine building blocks but changing the side groups we can direct their self-assembly on KBr from linear structures to flat well-ordered networks. We found that hydrogen-bonding moieties with carboxylic and diaminotriazine side groups prefer to self-assemble in well-ordered films while halogen atoms as side groups support the growth of π−π stacked linear structures with the molecules standing nearly upright on the surface.