STUDIES ON ABSORPTION-SPECTRA OF MIXED ZINC-CADMIUM SULFIDE MICROPARTICLES STABILIZED IN AOT-HEPTANE-WATER AND CTAB-CHLOROFORM-WATER INVERSE MICELLAR SYSTEMS

Ultrafine particles composed of mixed crystals of ZnxCd1-xS can be gen erated in situ in AOT-heptane-water and CTAB-chloroform-water microemu lsions using an ultrasonic processor. The microcrystallites exhibit th e ''quantum size effect''. The composition of mixed sulphides and the water content (pool size) of inverted micelles can be varied systemati cally and the band gap energies of the semiconductor particles can be determined from the photoabsorption thresholds (edges). The experiment al results reveal that a homogeneous solid solution of two sulphides i s formed in CTAB-chloroform-water system. A method is proposed for det ermining the bulk optical dielectric constants of solid solutions of t wo semiconductors employing the Brus equation.