Abstract
Although Cr-doped (0.85 at%) TiO 2 absorbs in the visible region, it becomes a photoconductor only through band-gap illumination and the doping causes a considerable decrease in photoconductance. Its activity for oxidations (oxalic acid, propene, 2-propanol) and for oxygen isotope exchange is nil under visible illumination and is 25–1000 times diminished under UV light. This is attributed to an increase in electron—hole recombination at the Cr 3+ ion sites. Conversely, similar doping might be envisaged to enhance the light stability of TiO 2-containing materials if the colorimetric properties were maintained.
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