Dresden 2006 – scientific programme
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O: Oberflächenphysik
O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)
O 29.26: Poster
Wednesday, March 29, 2006, 14:30–17:30, P2
Preparation of bimetallic AuAg/TiO2 model catalysts — •C. Weilach, S. Kielbassa, J. Bansmann, and R.J. Behm — Dept. of Suface Chemistry and Catalysis, University of Ulm
Studies on powder catalysts revealed, that using AuAg bimetallic particles instead of monometallic particles on metal oxides may enhance the performance and the stability of the catalytic system. Exploiting model catalysts with nm-sized bimetallic particles on flat TiO2(110) single crystal surfaces will give new insights on the significance of particle composition and size with respect to catalyst activity and stability. Therefore, we examined the growth of AuAg nanoparticles by subsequent evaporation and the influence of substrate temperature and evaporation order on this process. Furthermore we developed a new preparation method resulting in samples with metal particles of different composition. This creates the opportunity to investigate the morphology with AFM and the catalytic activity with a newly designed scanning-mass spectrometer setup at chemically different regions on one substrate.