Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 44: Poster Session II (Semiconductors; Oxides and Insulators: Adsorption, Clean Surfaces, Epitaxy and Growth; Surface Chemical Reactions and Heterogeneous Catalysis; Surface or Interface Magnetism; Solid-Liquid Interfaces; Organic, Polymeric, Biomolecular Films; Particles and Clusters; Methods: Atomic and Electronic Structure; Time-resolved Spectroscopies)
O 44.57: Poster
Mittwoch, 28. März 2007, 17:00–19:30, Poster C
Interaction of different SrTiO3 surfaces with reactive gases — •Florian Voigts1, Dominik Schwendt1, Martin Frerichs2, Christos Argirusis2, Günter Borchardt2, and Wolfgang Maus-Friedrichs1 — 1Institut für Physik und Physikalische Technologien, TU Clausthal, Leibnizstrasse 4, 38678 Clausthal-Zellerfeld, Germany — 2Institut für Metallurgie, TU Clausthal, Robert-Koch-Strasse 42, 38678 Clausthal-Zellerfeld, Germany
Donor doped SrTiO3 is well known for its capability as resistive high temperature oxygen sensor. An interesting application of this sensor would be the analysis of automobile exhaust, as it would allow the optimisation of fuel injection and of catalytic oxidation of toxic exhaust, thus reducing fuel consumption and pollution of the environment. Before this application can be implemeted, preliminary studies aiming at the interaction of SrTiO3 with reactive gases must demonstrate the stability of the material in this environment. Also, the influence of these gases on the interation with oxygen must be clarified.
We use Metastable Impact Electron Spectroscopy and Ultraviolet Photoelectron Spectroscopy to analyse the valence band structure of SrTiO3 and its adsorbates. X-ray Photoelectron Spectroscopy is used to check the stoichiometry of the samples. Our results for the interaction of SrTiO3 with CO, CO2, H2O, CH4 and other reactive gases being part of automobile exhaust are presented in this poster. We use SrTiO3(100) as model substance und compare our results with experiments on polycristalline SrTiO3 produced via a sol-gel route.