Abstract
A new method of size control for CdS nanoparticles, called common cation coprecipitation, is reported. In the course of coprecipitation, both CdS and CdSt2(cadmium stearate) formations are diffusion-controlled and their rates are quite different. The size of CdS nanoparticles depends on the ratio of initial concentrations of S2- to St- (stearateion). Chnracterized by UV-Vis absorption, XRD, TEM, fluorescence and XPS, the results obtained show that the coprecipitate is a composite, i.e. CdS particle inserts in the CdSt2, molecular layers to form a sandwirh-like structure. The method reported for size control of CdS nanoparticles might be called kinetic self-assembling.
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