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O: Fachverband Oberflächenphysik
O 24: Particles and clusters
O 24.6: Vortrag
Dienstag, 23. März 2010, 11:45–12:00, H34
X-ray absorption fine-structure spectroscopy of bimetallic Pt nanoparticles — •Torsten Laurus1, Ardalan Zargham1, Edyta Piskorska-Hommel1,2, Jan Ingo Flege1, Sarah Röhe3, Patrick Sonström3, Xiaodong Wang3, Marcus Bäumer3, and Jens Falta1 — 1Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee, 28359 Bremen, Germany — 2Institute of Physics, Polish Academy of Science, Al. Lotnikow 32/46, 02-668 Warsaw, Poland — 3Institute for Applied and Physical Chemistry, University of Bremen, Leobener Straße, 28359 Bremen, Germany
Bimetallic nanoparticles have generated great interest in recent years because of their huge number of possible applications, e. g., in future electronic and magnetic devices as well as in heterogeneous catalysis. Since the physical and chemical properties of the nanoparticles significantly depend on both their atomic structure and chemical composition, their material characteristics may individually be tailored provided that these parameters can be controlled.
Several Pt-containing bimetallic nanoparticles, produced by wet chemical synthesis, have been studied by means of fluorescence x-ray absorption fine-structure spectroscopy (XAFS), which was performed at beamlines C and E2 at the Hamburg Synchrotron Radiation Laboratory (HASYLAB/DESY). Our data allow the identification of the crystalline structure of the nanoparticles and the quantification of the local atomic coordination of the constituents. Furthermore, the analysis reveals details on their compositional inhomogeneity and the concomitant oxidation states of the individual components.