Photoelectrochemistry in particulate systems. Photosensitized charge injection into opaque TiO2 semiconductor powder as probed by time-resolved diffuse reflectance laser flash photolysis
✍ Scribed by Prashant V. Kamat; K.R. Gopidas; D. Weir
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 524 KB
- Volume
- 149
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Fluorescence emission of phenosafranin dye was quenched when this dye was adsorbed on Ti02 particles. Diffuse reflectance laser flash photolysis measurements have shown transient absorption corresponding to the cation radical of phenosafranin when the dye adsorbed on TiOr, was excited with a 532 nm laser pulse. The process of charge injection into TiOz particles was further confirmed by comparing the results of the diffuse reflectance and emission experiments with those from the dye-coated silica particles. Dependence of relative efficiency of charge injection on the surface coverage of the dye has also been elucidated.