title: Platinum-doped CeO2 thin film catalysts prepared by magnetron sputtering.
abstract: The interaction of Pt with CeO(2) layers was investigated by using photoelectron spectroscopy. The 30 nm thick Pt doped CeO(2) layers were deposited simultaneously by rf-magnetron sputtering on a Si(001) substrate, multiwall carbon nanotubes (CNTs) supported by a carbon diffusion layer of a polymer membrane fuel cell and on CNTs grown on the silicon wafer by the CVD technique. The synchrotron radiation X-ray photoelectron spectra showed the formation of cerium oxide with completely ionized Pt(2+,4+) species, and with the Pt(2+)/Pt(4+) ratio strongly dependent on the substrate. The TEM and XRD study showed the Pt(2+)/Pt(4+) ratio is dependent on the film structure.
authors.affiliation: Charles University, Faculty of Mathematics and Physics, Department of Surface and Plasma Science V Holesovickách 2, 18000 Prague 8, Czech Republic. matolin@mbox.troja.mff.cuni.cz
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