For additional use in industry and biomedicine, water-soluble -doped ZnS quantum dots (QDs) () 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 doping concentration and molar ratio on crystal structures and the luminescent intensity of QDs have been investigated. As a result, The as-prepared QDs had diameters of and a sphere monodisperse form that consists of nanoparticles of approximately . The optimum doping concentration and molar ratio were obtained when the photoluminescent emission showed a maximum value.
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