SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 29: Supported Nanoclusters: Structure, Reactions and Catalysis
O 29.5: Vortrag
Dienstag, 28. März 2023, 11:30–11:45, CHE 91
Ta atoms & clusters on Pt(111) - an XPS study — •Kevin Bertrang, Tobias Hinke, Matthias Knechtges, Federico Loi, Alessandro Baraldi, Sebastian Kaiser, and Ueli Heiz — Physical Chemistry, School of Natural Sciences, & Catalysis Research Center, Technical University of Munich
Thin films comprising Ta/TaxOy have been extensively studied on Pt surfaces. There is still a lack of profound understanding concerning the chemical interaction in the Ta/Pt interface and how it is affected during film growth and oxidation. In particular, an unambiguous attribution of the oxidation state of Ta is lacking which is largely complicated due to the numerous oxides and sub-oxides it can form.
In a bottom up approach we deposited low coverage of Ta atoms & clusters on a Pt(111) surface and probed the system by means of XPS using synchrotron radiation. Oxidation was studied using both atomic and molecular O2. Stability and surface mobility was studied. At liquid He a high variety of features are observed. In contrast at liquid N2 most Ta species are mobile and agglomerate to form structures stable up to high temperatures.