Abstract
CdS nanoparticles capped by thiourea and stabilized by PVP (poly N-vinyl-2-pyrrolidone) were prepared using a wet chemical route. The eventual particles size and size distribution can be systematically controlled by adjusting the relative ratios of thiourea to Cd 2+. The nanoparticles were characterized by transmission electron microscopy (TEM), ultraviolet visible (UV–vis) absorption spectra and photoluminescence (PL) spectra. The results show that the higher thiourea/Cd 2+ ratio leads to higher stability, smaller size and narrower size distribution. After the nanoparticles were capped by thiourea, the band emission of CdS nanoparticles can be observed in the PL spectra.
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