Three different TiO 2 samples in the form of bulk material, colloidal particles and small clusters supported on SiO 2 have been studied by extended x‐ray adsorption fine structure (EXAFS), UV‐visible, transmission electron microscopy (TEM) and XPS. The different values of the Ti 2p binding energies and the Auger parameter of Ti found for each sample show that the photoemission processes in these oxide materials are influenced by size and support effects. A difference in the relaxation energy of −1.1 eV is found for the TiO 2 /SiO 2 sample with respect to TiO 2 , which is attributed to an effect of the silica support.
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Fernández et al. (1992) studied this question.
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