Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.73: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
The adsorption of CO2 and CO on Ca and CaO films studied with MIES, UPS and XPS — •Sebastian Dahle1, Florian Voigts1, Kai Volgmann1, Fabian Bebensee2, and Wolfgang Maus-Friedrichs1 — 1Institut für Physik und Physikalische Technologien, TU Clausthal, Leibnizstrasse 4, 38678 Clausthal-Zellerfeld, Germany — 2Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
The adsorption of different atmospheric molecules on metals is both of fundamental and of technological interest that arises from several applications. Ca especially is used to enhance the performance of high temperature oxygen sensors based on SrTiO3, as a promoter in many catalytic reactions and as a metal electrode in different organic or polymeric semiconductor components. A lot of studies of the effect of Ca on different catalysts neglect the interaction of Ca itself with different gases, although this might contribute considerably to the role of Ca as a promoter in catalysis.
Our results for the interaction of Ca and CaO films with CO2 and CO are presented in this poster. For our studies, we employed Metastable Induced Electron Spectroscopy (MIES), Ultraviolet Photoelectron Spectroscopy (UPS), and X-ray Photoelectron Spectroscopy (XPS). Both CO2 and CO lead to the formation of CO32− complexes on top of the surface while being exposed to Ca or CaO.