Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 24: Catalysis: Structural Effects
O 24.4: Talk
Tuesday, March 17, 2015, 11:15–11:30, MA 144
Near-ambient pressure XPS investigation of the oxidation of liquid Gallium and Platinum-Gallium alloys — •Mathias Grabau1, Sandra Krick-Calderón1, Florian Rietzler1, Florian Maier1, Nicola Taccardi2, Hans-Peter Steinrück1, and Christian Papp1 — 1Physikalische Chemie II, University of Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany — 2Lehrstuhl für Chemische Reaktionstechnik, University of Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany
The oxidation of the liquid samples of gallium and gallium based platinum alloys (2 and 5 wt% Pt) by molecular oxygen at temperatures between 300 and 550 K was examined using near ambient pressure XPS. Gallium oxide films of different thickness were prepared on the surface of the liquid samples under isothermal and isobaric conditions; the growth was monitored in situ. The thickness of the prepared oxide films increased to up to 30 Å with rising temperature and O2 pressure. The gallium oxide films were found to be stable in UHV up to temperatures just below 740 K. Enrichment of metallic platinum in the grown gallium oxide films was found for the examined alloys. The enrichment of platinum in the oxide films was found to be independent of the composition of the alloy, the film thickness, and the temperature and pressure during growth of the oxide films.
We acknowledge the financial support of the Cluster of Excellence 'Engineering of Advanced Materials'.