CRYSTAL-GROWTH OF POLYCRYSTALLINE ALPHA-CDS ON CONDUCTING POLYMERS

Conducting polypyrrole polymers were doped during polymerization with α-CdS crystals. Doping made the polymers effective nucleators of a-CdS. Once the doped polypyrrole specimens were introduced into supersaturated cadmium sulfide solutions, α-CdS precipitated immediately without any precursor phase or induction period. The rates of precipitation were found to depend on the solution supersaturation and were maximum at an optimum dopant concentration of 6.4‥ w/w. Increasing dopant concentrations decreased the polymer conductivity and increased its p-semiconducting character, possibly through structural changes induced by doping. © 1990, American Chemical Society. All rights reserved.