The interaction of D 2 O with the CeO 2 (001) surface was studied with temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). It was found with TPD that D 2 O desorption occurs in three states with temperatures of 152, 200, and 275 K, which are defined as multilayer D 2 O, weakly bound surface D 2 O, and hydroxyl recombination, respectively. O 1s XPS measurements for high D 2 O exposures, where multilayer water desorption was observed in the TPD, resulted in emission from only the substrate and surface hydroxyls. This is likely due to a nonwetting behavior of D 2 O on this surface with the formation of nanosized clusters. An analysis of the O1s XPS data indicates that the surface has a hydroxyl coverage of 0.9 monolayers for large water exposures at 85 K. This is consistent with a model in which the polar CeO 2 (001) surface can be stabilized by a reduction of the dipole in the top layer by the formation of a full monolayer of hydroxyls.
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Herman et al. (1999) studied this question.
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