Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)

O 58.23: Poster

Mittwoch, 28. März 2012, 18:15–21:45, Poster B

Self-assembled monolayers of phthalocyanines on gold substrates — •Nadezda Lilicenko¹, Florian Vogel¹, Ulrich Glebe², Ulrich Siemeling², and Frank Träger¹ — ¹Institur für Physik and Center for Interdisciplinary Nanostructure Scienece and Technology - CINSaT, Universität Kassel, Germany — ²Institur für Chemie and Center for Interdisciplinary Nanostructure Scienece and Technology - CINSaT, Universität Kassel, Germany

Stable self assembled monolayers (SAMs) of advanced molecules on metal surfaces have attracted considerable attention over the last years. SAMs have found many applications, for example in nanotechnology, as biosensors, for chemical vapour sensing or molecular electronics. In this context, phthalocyanines (PCs) are of great interest, because they exhibit fascinating physical properties, which arise from their delocalized pi-electrons. In our experiments we have used two thioether substituted (sub-)phthalocyanine derivatives for SAM formation, one subphthtalocyanine with boron as central atom and one bis(phthalocyaninato)terbium - single molecular magnet. To study the adsorption of the molecules, we applied optical second harmonic generation (SHG). SHG permits to monitor adsorption process as well as the ordering within the film. The information about monolayer formation kinetics was obtained by fitting the measured SHG data with three kinetic models: first-order, second-order and diffusion limited Langmuir kinetic. As a complementary technique to proof that only monolayer formation takes place, ellipsometric measurements have been performed.