A major challenge in heterogeneous photocatalysis is the need to increase charge separation efficiency of a photocatalyst, under illumination, without any applied electrical potential. Regularly patterned TiO 2 films were formed on a SnO 2 -film coated soda lime glass substrate by using an organically modified sol−gel method. This bilayer-type photocatalyst exhibited a very high photocatalytic activity for gas-phase reactions. Efficient interfacial electron transfer from the TiO 2 overlayer to the SnO 2 underlayer was demonstrated by labeling and visualizing the reduction sites with Ag particles.
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Tada et al. (2000) studied this question.
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