Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 29: Nanostructures at Surfaces III: Dots, Particles, and Clusters
O 29.5: Vortrag
Dienstag, 2. April 2019, 11:30–11:45, H25
Elucidating morphology changes in MgO supported Palladium nanoparticles — •Jan-Christian Schober1,2, Simon Chung1, Vedran Vonk1, and Andreas Stierle1,2 — 1Deutsches Elektronensynchrotron Hamburg — 2Universität Hamburg, Fachbereich Physik
Noble metals are of great importance in heterogeneous catalysis of CO oxidation and NOx reduction. While already existing practical applications usually consist of oxide supported nanoparticles, oxidation behaviour and the precise catalytic processes occuring are still not completely understood on the atomic scale.
It was shown that at elevated temperature and in oxygen atmosphere palladium nanoparticles undergo a reversible shape change [1], however the time-scale and energetics of this process are still unknown. We aim to build on the results of this study and elucidate the formation and diminishing of the {112} facets in oxygen atmospheres ranging from ultra-high-vacuum to 1 bar and temperatures from 300 K to 900 K in order to establish a phase diagram of the particle morphology.
Observing the intensity of the {111} and {112} facet in a diffraction experiment allows to determine the conditions at which the phase change occurs as well as the relative size of the facets.
[1] P. Nolte et al., Nano Lett. 1, 4697-4700 (2011)