Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 54: Nanostructures at surfaces II
O 54.9: Vortrag
Mittwoch, 28. März 2012, 18:45–19:00, MA 042
RHEED Study of Ag Nanoparticles for catalytic reactions — •Stephan Bartling1, Hannes Hartmann1, Vladimir Popok2, I. Barke1, and Karl-Heinz Meiwes-Broer1 — 1Institut für Physik, Universität Rostock, 18051 Rostock, Germany — 2Department of Physics and Nanotechnology, Aalborg University, 9220 Aalborg, Denmark
Size-selected silver clusters deposited on amorphous alumina films can act as high performance nanocatalysts for the partial oxidation of propylene [1].
This contribution focuses on in situ reflection high energy electron diffraction (RHEED) investigations of deposited Ag clusters on amorphous alumina films. For randomly oriented particles a ring structure, similarly to the Debye-Scherrer rings in conventional X-ray powder diffraction is expected [2]. Diffraction patterns after different sample treatments (heating, varying ambient environment) are presented. The cluster structure and orientation with respect to the substrate is discussed. The analysis is supported by height distributions obtained from ex situ AFM measurements.
[1] L.M. Molina et al., Catalysis Today 160, 116 (2011)
[2] A. Kleibert et al., Phys. Status Solidi B 247, 1048 (2010)