Abstract
Two well characterized photosensitizers, namely, 4-m- methoxy-p-hydroxy benzylidene-2-m-methoxy- p-hydroxystyryl-1-phenyl-2-imidazolin-5-one (subsequently referred to as 2-imidazolin-5-one) and Rose Bengal, have been used together to sensitize sprayed ZnO thin film electrodes in aqueous and acetonitrile media. Through current–potential curves and action spectra (iphoto/λ), it has been confirmed that both dyes, when present together, contribute additively to the sensitized photocurrent. The quantum efficiencies of the dye- sensitized photocurrent at 480 and 555nm wavelengths (λmax of 2-imidazolin-5-one and Rose Bengal, respectively) were found to be 3.5 and 4.4%, respectively, in aqueous solution, while in acetonitrile medium the corresponding values were 4 and 6.5%.
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