EPR and SAXS studies of a TiO<inf>2</inf>-based gel

Abstract

The response of a photosensitive TiO 2 -based gel to UV light is described. Upon irradiation, the gel adsorbs light at 365 nm and becomes dark blue due to the transformation of the Ti 4+ centers into Ti 3+ . This behavior is revealed using electron paramagnetic resonance spectroscopy as a function of the gel chemical composition. The structure of the TiO 2 network is studied by small angle x-ray scattering.