Abstract
Ion scattering spectroscopy (ISS), Auger electron spectroscopy (AES) and crystal current measurements have been used to characterize the growth of titania overlayers deposited on a Rh(111) surface. Titania grows two-dimensionally during the first monolayer, with subsequent growth nearly layer-by-layer. The results show agreement among ISS, AES, and crystal current measurements in determination of monolayer coverage. The effect of titania on the chemisorption of CO on Rh(111) has also been investigated and compared with previous studies of titania deposited on Group VIII metals. Temperature-programmed desorption (TPD) of CO shows that titania has relatively little effect on the desorption energy of CO, and that the chemisorption capacity is proportional to the exposed Rh area. The results support a site-blocking model of chemisorption suppression.
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