Abstract
For additional use in industry and biomedicine, water-soluble Cu2+-doped ZnS quantum dots (QDs) (ZnS:Cu) were synthesized with thioglycolic acid (TGA) as the stabilizer in aqueous solutions in air. The products were characterized by x-ray diffraction, ultraviolet–visible spectroscopy, transmission electron microscopy, and photoluminescence. The effect of Cu2+ doping concentration and TGA/(Zn+Cu) molar ratio on crystal structures and the luminescent intensity of ZnS:Cu QDs have been investigated. As a result, The as-prepared ZnS:Cu QDs had diameters of 10–12 nm and a sphere monodisperse form that consists of ZnS:Cu nanoparticles of approximately 2 nm. The optimum Cu2+ doping concentration and TGA/(Zn+Cu) molar ratio were obtained when the photoluminescent emission showed a maximum value.
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