Synthesis and characterization of Cu2+ doped ZnS nanoparticles using TOPO and SHMP as capping agents

► Enhanced PL emission was obtained using surfactants. ► Optimum concentration of impurity ions was determined by PL emission. ► Through the surfactants, the surface defect of the nanoparticles was reduced. ► Quantum confinement effect was observed for ZnS:Cu nanoparticles.