Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.39: Poster
Tuesday, April 1, 2014, 18:30–22:00, P1
Modeling catalytic reactions: graphene-supported Pd nanoclusters studied with high-resolution X-ray photoelectron spectroscopy — •Karin Gotterbarm, Carina Bronnbauer, Udo Bauer, Christian Papp, and Hans-Peter Steinrück — Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen
In our study, graphene was grown on a Rh(111) single crystal surface by chemical vapour deposition of propylene at elevated temperatures. The corrugated graphene layer serves as a template for the evaporation of Pd nanoclusters with a narrow size distribution. The growth of the clusters and their interaction with adsorbates was investigated by fast X-ray photoelectron spectroscopy (XPS) performed at the synchrotron facility BESSY II. We found a cluster-by-cluster growth mode. Upon annealing, we observe restructuring and agglomeration of the clusters. At temperatures above 850 K, intercalation of the palladium under the intact graphene sheet is observed. The interaction of the Pd particles with CO and O2 was investigated in all relevant core levels in a temperature range from 150 up to 500 K. The adsorbate coverage varies with temperature and shows a strong dependency on the structure of the clusters.