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Abstract-In the present work ZnS nanoparticles were synthesized by chemical co-precipitation method at room temperature. The structural properties of ZnS nanoparticles were determined by XRD (X-ray Diffraction), TEM (Tunneling Electron Microscopy) and their optical properties by UV-Visible and PL (Photoluminescence) analyses. XRD analysis showed that sample prepared were the cubic Zinc blende structure with particles' size in the ranges 5nm -12nm. The TEM analysis revealed the formation of ZnS nanoparticles with almost uniform shape and size. In optical characterization the UV_Visible spectra show a large blue shift. In PL analysis, three strong and board emission bands located at 365nm, 400nm and 425nm have been observed. It is well known that the luminescent peak centered at 365nm could be assigned to the UV-excitonic emission and other peaks attributing to the sulfur vacancy.

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