Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 20: Nanostructures at Surfaces II
O 20.13: Vortrag
Montag, 31. März 2014, 19:00–19:15, WIL B321
Structural Changes of Cobalt Nanoparticles during Chemical Reactions: A RHEED Study — •Stephan Bartling, Ingo Barke, Hannes Hartmann, Steve Jäger, and Karl-Heinz Meiwes-Broer — University of Rostock, Institute of Physics, 18051 Rostock, Germany
Size-selected cobalt oxide clusters deposited on amorphous alumina films can act as selective and efficient nanocatalysts for the dehydrogenation of cyclohexane [1]. In this contribution we present a new setup for reflection high energy electron diffraction (RHEED) under reactive conditions up to a pressure of 10−3 mbar. Soft-landed Co clusters of sizes in the nm range are exposed to oxygen and heated during the experiment. The evolution of RHEED patterns shows that the particles significantly change their structure at a critical temperature. The contributing phases are discussed in view of expected cobalt oxide stoichiometries and morphologies.
[1] E.C. Tyo et al., ACS Catalysis 2 (11), 2409 (2012)