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Cadmium sulfide (CdS) was encapsulated in poly(methylmethacrylate), poly(styrene) or poly(vinylcarbazole) by the encapsulating polymerization process, and its photoconductivity was investigated. As result, it was observed a remarkable light‐sensitive effect. The light sensitive effect of CdS encapsulated in poly(methylmethacrylate) (C‐MMA‐CdS) is particularly marked and depends largely on the encapsulation rate. The photosensitive mechanisms of encapsulated cadmium sulfide (C‐CdS), CdS material, and CdS/polymer dispersion composites were discussed and compared. Furthermore, the temperature dependence of the dark current and the initial rising rate of the sensitizing photocurrent were studied.

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