Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
O: Oberflächenphysik
O 15: Postersitzung (Adsorption an Oberfl
ächen, Epitaxie und Wachstum, Organische Dünnschichten, Oxide und Isolatoren, Rastersondentechniken, Zeitaufgelöste Spektroskopie, Methoden)
O 15.22: Poster
Freitag, 4. März 2005, 17:00–20:00, Poster TU D
Self-ordering of hexa-peri-hexabenzocoronene and derivatives on Cu(111) — •Leo Gross1, Francesca Moresco1, Pascal Ruffieux2, André Gourdon3, Christian Joachim3, and Karl-Heinz Rieder1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany — 2Swiss Federal Laboratories for Materials Testing and Research, Überlandstrasse 129, 8600 Dübendorf, Switzerland — 3The Nanoscience Group, CEMES-CNRS, 29 rue J. Marvig, P.O. Box 94347, F-31055 Toulouse Cedex, France
An LT-STM study of the submonolayer growth of hexa-peri-hexabenzocoronene (HBC) and three custom designed derivates on Cu(111) is presented. Thanks to the systematic choice of molecules it was possible to assign properties of adsorbates to specific chemical groups inside the molecule. We find that tert-butyl side groups induce intermolecular attraction, while their influence on the molecule-substrate bonding is negligible. The planar aromatic HBC core is on the other hand strongly bound to the substrate inducing a fixed molecular orientation. Best monolayer ordering has been found for a molecule with tert-butyl side groups and a molecular core that bounds only at the central position, allowing a rotation in the absence of other pinning centres.