Photochemistry of semiconductor particles II. Adsorption of ions on ZnS colloid and quenching of fluorescence

Various ions were used to study the adsorption on the ZnS particle and the quenching of fluorescence. Three kinds of adsorption process were found for these ions. The mechanism of the fluorescence quenching depends on the nature of the adsorption process. A nearly dynamic quenching was found for MV...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 1994-05, Vol.79 (3), p.197-202
Main Authors: Zang, Ling, Liu, Chun-Yan, Ren, Xin-Min
Format: Article
Language:English
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Summary:Various ions were used to study the adsorption on the ZnS particle and the quenching of fluorescence. Three kinds of adsorption process were found for these ions. The mechanism of the fluorescence quenching depends on the nature of the adsorption process. A nearly dynamic quenching was found for MV 2+ ions, whereas quenching by Cd 2+ ions was mainly through the static process. The quenching efficiency is determined by the chemical properties of the ion, such as the adsorbability and redox potential. Of all ions used, the Cd 2+ and MV 2+ ions are the most effective quenchers. It has also been found that the quenching depends strongly upon the surface condition, which determines the distribution of the photogenerated charge carriers in the ZnS particle.
ISSN:1010-6030
1873-2666
DOI:10.1016/1010-6030(93)03761-5