The electron spin resonance spectrum of superoxide anion radical adsorbed on the surface of colloidal TiO 2 was detected directly at room temperature for the first time. This signal was generated partially by porphyrin-sensitized titanium dioxide, i.e., the reduction of adsorbed oxygen on the TiO 2 nanocluster surface by the just injected electron from the excited porphyrin.
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Yu et al. (2004) studied this question.
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