Uncoated ZnO,CdS and ZnO/CdS nanocomposites were successfully synthesized chemically in atmospheric air using a water-ethanol matrix.The as-obtained samples were characterized by X-ray diffraction,transmission electron microscopy(TEM),UV-vis and photoluminescence(PL) spectrophotometry.The luminescence measurements of ZnO/CdS nanocomposites showed narrow and enhanced PL emission in the blue region.PL quenching was observed in ZnO/CdS nanocomposites by increasing Cd and S concentrations. Uncoated ZnO, CdS and ZnO / CdS nanocomposites were successfully synthesized chemically in atmospheric air using a water-ethanol matrix. The as-obtained samples were characterized by X-ray diffraction, transmission electron microscopy (TEM), UV-vis and photoluminescence ) spectrophotometry. The luminescence measurements of ZnO / CdS nanocomposites showed narrow and enhanced PL emission in the blue region. PLA quenching was observed in ZnO / CdS nanocomposites by increasing Cd and S concentrations.