Abstract
Cadmium sulfide (CdS) was encapsulated in the styrene-acrylonitrile copolymers (C-St·AN-CdS) by the encapsulating polymerization process. The compositions of the encapsulating copolymer and homocopolymer were determined by the elementary analysis. The monomer reactivity ratios were obtained by the Fineman-Ross method, and the reaction behavior of the copolymerization was investigated. The monomer reactivity ratios for the encapsulating copolymer were considerably different from the value of the ordinary St-AN radical copolymerization, and those for the homocopolymer were almost the same.
The photocurrent of C-St·AN-CdS increased considerably, as compared with CdS alone, in a particular range of the AN composition ratio. C-St·AN-CdS showed the maximum relative sensitivity at the AN composition ratio of 9.7mol%. Furthermore, the dark current-voltage characteristics, the light intensity dependence of photocurrent, and the damping characteristics of photocurrent were measured, and the photoconductive mechanisms of these C-St·AN-CdS were discussed.
