Abstract
The fields of photo-assisted heterogeneous catalysis and silver halide based photographic systems have a number of common features. They both utilize particulate semiconducting materials to absorb the incident radiation and produce photoelectrons and photoholes. Recombination of these charge carriers is counter productive, since they are the reagents relied upon for the initiation of subsequent events crucial to overall process efficiency. From this perspective, it is not unusual that progress in these seemingly diverse fields is proceeding in similar directions. In both fields heterojunction structures are employed to promote the separation of charge carriers on the supposition that this will increase efficiency — as measured by increased product yield in photocatalysis and increased Ag+ ion reduction in photographic systems. The determination of time resolved charge transport parameters has been recognized as essential for the achievement of a detailed understanding of the photophysics and chemistry of these systems. Their particulate nature places special demands on the techniques employed in the characterization of electronic transport properties and on the interaction of electronic and ionic charge carriers with other chemical species. In the field of silver halide imaging, the time resolved photocharge technique (TRPC) has been applied to the investigation of what have been termed photographic heterojunction diodes and transistors. Descriptions of the formulation and characterization of a number of these heterojunction systems will be given with the intent of illustrating similarities with approaches being taken in the field of photocatalysis. Recent TRPC measurements on TiO2 and Pt/TiO2 particulate systems will also be discussed.
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Levy, B. (1991). Photocatalytic and Photographic Heterojunctions. In: Pelizzetti, E., Schiavello, M. (eds) Photochemical Conversion and Storage of Solar Energy. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3396-8_20
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DOI: https://doi.org/10.1007/978-94-011-3396-8_20
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