Synthesis of PVA capped hexagonal CdS nanocrystals at Room temperature

Cadmium sulphide nanocrystals with Cd:S molar ratio 0.02:0.02 and 0.04:0.04 has been synthesized by chemical coprecipation method at room temperature using poly vinyl alcohol (PVA)as capping agent. The crystallite sizes are determined from XRD analysis. The X-ray diffraction analysis confirms that hexagonal phase cadmium sulphide nanocrystals are formed. The average crystallite sizes are found to be6 nm. From UV-visible spectra the band gap is found to be between 2.53-2.56 eV indicating a significant blue shift from it bulk band gap energy 2.42 eV. Keyword: Nanocrystals, PVA, XRD, Band gap, UV-visible.