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O: Fachverband Oberflächenphysik

O 89: Metal substrates: Adsorption of organic / bio molecules V

O 89.3: Vortrag

Freitag, 30. März 2012, 11:00–11:15, A 053

Self-assembly of Tetrathiafulvalene-Fused Dipyridophenazine (TTF-dppz) analyzed by tuning fork based AFM/STM — •Sweetlana Fremy¹, Rémy Pawlak¹, Shigeki Kawai¹, Shi-Xia Liu², Silvio Decurtins², Ernst Meyer¹, and Thilo Glatzel¹ — ¹Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland — ²Department of Chemistry, University of Bern, Freie Strasse 3, CH-3012 Bern, Switzerland

A main challenge of molecular electronics consists in controlling the self-assembly on a surface, which is a highly complex dynamic process with competing binding modes (molecule-surface and intermolecular interactions), driven by thermodynamic and kinetic selectivity. Here, we investigate the self assembly of TTF-dppz molecules (Tetrathiafulvalene-Fused Dipyridophenazine) on metal substrates and insulating thin films by combined tuning fork based atomic force and scanning tunneling microscopy at low temperature. The molecules are additionally functionalized with cyano-groups to yield in a better surface sticking, especially on insulating substrates. While directly after deposition on Cu(111), the molecules are disordered, post-annealing at 100°C leads to highly ordered self-assemblies of molecular wires, a network with six-fold symmetry, small crystallites and step edge decorations. Most probably the molecules decompose during the annealing, involving Cu-adatoms. The fact, that TTF-dppz molecules do not form such ordered structures on Ag(111), strengthens our presumption. Further investigations comprise the study of single molecules on thin films and the adsorption of the two single compounds dppz and TTF.