Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 56: Poster Wednesday: Nanostructures 2
O 56.4: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
CO Adsorption on PdPt Alloy Nanoparticles — •Daniel Silvan Dolling1,2, Jan-Christian Schober1, 2, Marcus Creutzburg1, Heshmat Noei1, 2, and Andreas Stierle1, 2 — 1Universität Hamburg — 2DESY
Platinum palladium alloy nanoparticles are of high interest because of their role as catalysts for different processes, including exhaust control and methane oxidation. Catalyst behavior is determined by the shape, structure and alloy composition of the particles. To enhance catalyst efficiency, it is thus necessary to improve our understanding of the structure of the nanoparticles and the active adsorption sites. In order to access detailed structural and morphological information, we employ the use of a model catalyst. In this work, platinum and palladium are co-deposited via molecular beam evaporation on α-Al2O3 (0001). The nanoparticles are grown epitaxially and have a well defined height to diameter ratio and alloy composition. By investigating the particle surface with the probe molecule CO using polarized infrared reflection absorption spectroscopy (IRRAS), we determined the surface species on top and side facets of the particles. The morphology was further identified with X-ray diffraction and X-ray reflectivity. The effect of the Pd/Pt alloy composition on the adsorption was investigated by comparing the IRRAS reflectivity. Moreover, the difference in the adsorption of CO was studied for samples annealed in hydrogen and oxygen.