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Nanocrystalline bare and Mn 2+ doped CdS with different concentration have been synthesized by employing a simple chemical co-precipitation method. In order to gain crystalline nanoparticles of CdS and CdS:Mn; cadmium acetate, sodium sulphide and manganese (II) acetate have been utilised as the supply of cadmium, sulphur and manganese (Mn) respectively. DMF has been used as the stabilizing agent and also the reaction catalyst. The structural analysis of the prepared samples by X-ray diffraction (XRD) exhibits the Mn 2+ dopant atoms are incorporated at the Cd sites and authenticate the cubic phase, without affecting the original cubic phase of CdS and the particle size estimated to be around 3 to 5 nm. The scanning electron microscopy has been employed to study the morphology of the prepared samples. UV-Vis spectral analysis validates the significant blue shift in the optical band gap of CdS nanoparticles on account of the quantum confinement impact. The optical band gap of the samples is found to be decreasing with the accumulation of dopant content. The presence of functional groups in the prepared samples has been detected by making use of the FTIR technique. The PL emission spectrum shows two major emission peaks one in the blue region and second in the red region along with one broad lower intense peak in the IR region.

In this analysis, ZnS nanoparticles have been synthesized employing an easy chemical co-precipitation route using metal precursors and DMF (CH 3 ) 2 NC(O)H as a stabilizing agent. The obtained ZnS nanoparticles have been characterized through XRD, TEM, UV-Vis, FTIR and PL measurements. The foremost intense broad peaks in the diffraction outline reveal the crystalline character of the prepared material with the particle length is approximately 4.7 nm. The optical band gap has been evaluated from the UV-Vis. absorption spectrum which is found to be about 3.95 eV. The blue swing in absorption spectra validates the formation of nanoparticles. Further, the TEM micrograph revealing the ZnS particles are in nano dimension. FTIR study has been carried out for the bond evaluation. The PL measurement shows the emission of colour in the blue area.