For additional use in industry and biomedicine, water-soluble ${\mathrm{Cu}}^{2+}$ -doped ZnS quantum dots (QDs) ( $\mathrm{Zn}\mathrm{S}\text{:}\mathrm{Cu}$ ) 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 ${\mathrm{Cu}}^{2+}$ doping concentration and $\mathrm{TGA}/(\mathrm{Zn}+\mathrm{Cu})$ molar ratio on crystal structures and the luminescent intensity of $\mathrm{Zn}\mathrm{S}\text{:}\mathrm{Cu}$ QDs have been investigated. As a result, The as-prepared $\mathrm{Zn}\mathrm{S}\text{:}\mathrm{Cu}$ QDs had diameters of $10–12\mathrm{nm}$ and a sphere monodisperse form that consists of $\mathrm{Zn}\mathrm{S}\text{:}\mathrm{Cu}$ nanoparticles of approximately $2\mathrm{nm}$ . The optimum ${\mathrm{Cu}}^{2+}$ doping concentration and $\mathrm{TGA}/(\mathrm{Zn}+\mathrm{Cu})$ molar ratio were obtained when the photoluminescent emission showed a maximum value.

© 2010 Optical Society of America

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