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A new and convenient route is developed to synthesize CdSe and core-shell CdSe/CdS quantum dots(QDs) in aqueous solution.The gaseous precursors,H2Se and H2S,generated on-line by reducing SeO 3 2à with NaBH 4 and the reaction between Na 2 S and diluted H2SO 4,are used to form high-quality CdSe and CdSe/CdS QDs,respectively.The synthesized water-soluble CdSe and CdSe/CdS QDs possess high quantum yield(3% and 20%) and narrow full-width-at-half-maximum(43 nm and 38 nm).The synthesis process is easily reproducible with simple apparatus and low-toxic chemicals,and can be readily extended to the large-scale aqueous synthesis of QDs.
A new and convenient route is developed to synthesize CdSe and core-shell CdSe / CdS quantum dots (QDs) in aqueous solution. Gaseous precursors, H2Se and H2S, generated on-line by reducing SeO 3 2à with NaBH 4 and the reaction between Na 2 S and diluted H2SO 4, are used to form high-quality CdSe and CdSe / CdS QDs, respectively. These synthesized water-soluble CdSe and CdSe QDs possess high quantum yield (3% and 20%) and narrow full- width-at-half-maximum (43 nm and 38 nm). The synthesis process is easily reproducible with simple apparatus and low-toxic chemicals, and can be readily extended to the large-scale aqueous synthesis of QDs.