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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Nanoparticles and Composite Materials

CPP 8.45: Poster

Montag, 26. März 2012, 17:30–20:00, Poster A

Transmission electron microscopy investigation of a gold / TiO₂ catalyst — •Kristian Frank, Andre Wichmann, Arne Wittstock, Lutz Mädler, Marcus Bäumer, and Andreas Rosenauer — Universität Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany

Nanoporous gold is a material for many applications e.g. in catalysts, sensors and electrode materials. It is created by chemical etching of a gold - silver alloy. Important structural properties are the pore size and the size of the gold ligaments. For the application in catalysis of CO-oxidation, the gold can be coated with TiO₂ in order to enhance catalytic activity. In the temperature range above 60 ^∘C the CO conversion of the TiO₂ coated sample is increased by more than one order of magnitude compared with the pure nanoporous gold. The structure and distribution of the TiO₂ on the gold surface is an important property, which was investigated by TEM. It was shown, that the gold ligaments are abundantly covered by approximately 5 nm TiO₂ particles. The determination of the largest lattice fringe distance with HR-TEM revealed that the crystalline nanoparticles consist of the anatase phase. The spatial Ti distribution was measured with EFTEM (energy filtered TEM).