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Bicrystalline rutile TiO2(001) crystals were employed for the direct observation of grain-boundary effects on the photocatalytic properties of this material. Irradiating the surface of the bicrystal with UV light in aqueous AgNO3 solution caused photocatalytic reduction of Ag ions, resulting in Ag precipitation on the surface. The Ag precipitation was significantly enhanced at the grain boundary, and an array of large Ag particles was clearly observed. Thus, direct evidence for a charge-separation enhanced photocatalytic reaction caused by the lattice strain localized at the grain boundary was obtained.
Masayuki Kamei (Fri,) studied this question.
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