Abstract
Pd x Co 1− x thin layers with different stoichiometry, prepared by DC magnetron sputtering on α-Al 2O 3 (sapphire) substrates, were investigated by X-ray photoelectron spectroscopy (XPS), static secondary ion mass spectroscopy (SSIMS) and temperature programmed desorption (TPD). The shifts of Pd 3d, XPS Auger Pd-MNN and the valence-band centre toward higher binding energies due to the formation of a bimetallic bond were observed. CO adsorption properties of the alloys were strongly dependent on alloy stoichiometry. The common property was the lowering of the CO desorption temperature with respect to the desorption from pure metals. The SSIMS study showed that CO partially dissociated on Co–Pd alloy surfaces.
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