Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 57: Surface Chemical Reactions and Heterogeneous Catalysis II
O 57.11: Vortrag
Donnerstag, 29. März 2007, 18:15–18:30, H38
Plasma modified bimetallic nanocolloid arrays - a model system for structural and order effects in particle catalysis — •Bernhard Gehl1, Jan Ingo Flege2, Vesna Aleksandrovic3, Thomas Schmidt2, Sigrid Bernstorff4, Jens Falta2, Horst Weller3, and Marcus Bäumer1 — 1Institut für Angewandte und Physikalische Chemie, Universität Bremen, Leobener Strasse NW2, 28359 Bremen, Germany — 2Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee, 28359 Bremen, Germany — 3Institut für Physikalische Chemie, Universität Hamburg, Grindelallee 117, 20146 Hamburg, Germany — 4Sincrotrone Trieste, Strada Statale 14, km 163.5, in Area Science Park, 34012 Basovizza / Trieste, Italy
The high surface to volume ratio and special chemical properties of nanoparticles have made them a very common class of materials for catalytic coatings. Well-defined monolayers of nanoparticles were obtained by spin-coating of bimetallic colloidal particles on oxidic substrates. Plasma treatment and thermolysis were applied to strip the particles of the organic ligands serving as stabilizers in the liquid phase and as spacers during deposition. With SEM, GISAXS, and XPS the structural and chemical changes induced by both cleaning methods were examined.