One step growth of PVP spheres embedded with nearly monodispersive CdS nanocrystals using chemical bath deposition

We have used simple chemical bath deposition technique to grow nearly monodispersive CdS nanocrystals in PVP matrix. Systematic study of variation of growth parameters has revealed that optimized growth of CdS nanocrystals in PVP matrix depends on relative concentration of Cd acetate/Thiourea to polyvinyl pyrrolidone in the bath. It is also observed that higher concentration (1M) of Cd acetate/Thiourea gives rise to smaller NCs compared to lower concentration (0.5M), however density of particles is large in thin film grown using 1M concentration. Scanning electron microscopic studies show that it is a nanoparticulate film of spheres of size around 100-200nm. Further, absorption, energy dispersive spectroscopy and transmission electron microscopic investigations reveal that nearly monodispersive CdS nanocrystals are embedded in 100-200 nm PVP spheres for the range 0.5 M, 1M Cd acetate/Thiourea concentration (figure 1). The effect of varying PVP, Cd acetate/Thiourea concentration, sequence and addition of ingredients and heating/cooling cycles have been studied and results are corroborated with existing theory.

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