Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 56: Poster Wednesday: Nanostructures 2
O 56.3: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
Design of an Enhanced Ce-Evaporator for CexOy Thin Film Synthesis — •Flora Siegele, Kevin Bertrang, Tobias Hinke, and Ueli Heiz — Physical Chemistry, Department of Chemistry and Catalysis Research Center, Technical University of Munich
In today’s industry, the importance of sustainability regarding resource consumption and waste management is strongly increasing and hence, the contribution of catalysis-based processes is becoming more and more important. Substantial advances can be achieved by investigating catalytic model systems to facilitate the understanding of basic mechanisms on a molecular level. These model catalysts comprise a metal single crystal substrate with metal clusters (1-100 atoms), deposited on a metal oxide thin film (2-20 ML). Especially the lewis acidic and basic properties of metal oxidic compounds showed promising results in terms of controlled tuning of the catalytic performance. However, the reducibility of thin film materials like CeO2 offers an additional possibility of adjusting catalytic properties. Due to the lack of experimental results focusing on the influence of CeO2 thin films on the reactivity and selectivity of clusters, the poster presents the implementation of an optimized CeO2 thin film generation procedure with a home-built ribbon evaporator. With this evaporator design, including a self-built quartz crystal microbalance, deposition rates of multiple monolayers per minute could be achieved and tracked with high accuracy. Electron emission spectroscopy (x-ray photoelectron spectroscopy and Auger electron spectroscopy) was performed to investigate the composition of the deposited film.