Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 66: Nanostructures at Surfaces VI (Surface Reconstructions)
O 66.6: Vortrag
Freitag, 30. März 2007, 11:30–11:45, H36
Low pressure Hydrogen Loading of Pd nanoparticles and films using a Hydrogen plasma — •Hans-Gerd Boyen1, Paul Ziemann1, Anitha Ethirajan1, Luyang Han1, Ulf Wiedwald1, Andriy Romanyuk2, and Peter Oelhafen2 — 1Institut für Festkörperphysik, Universität Ulm, D-89069 Ulm} — 2Institut für Physik, Universität Basel, CH-4056 Basel
The loading of metals with atomic Hydrogen is usually performed in (molecular) Hydrogen atmospheres at elevated pressures (several bars) in order to overcome the problem of small dissociation rates at the surface of the corresponding metal. Here, we present an experimental study for the in-situ loading with atomic Hydrogen of Pd nanoparticles of different size (10nm,3nm, prepared by a micellar method) as well as of a Pd bulk reference sample using a Hydrogen plasma (0.1mbar). The chemical state of the different samples is studied by means of X-ray photoelectron spectroscopy (XPS) allowing to identify the interdiffusion of Hydrogen atoms into the metal by means of an hydride-induced chemical shift of the Pd-3d core levels. First results for the loading/unloading behaviour of the different samples (bulk, nanoparticles) will be presented.