A kind of preparation method of cadmium, ytterbium co-doped zinc sulfide quantum dots
A technology of co-doping and zinc sulfide, applied in the preparation of ytterbium co-doping zinc sulfide quantum dots, in the field of cadmium, can solve the problems of toxicity of thioglycolic acid, harsh reaction conditions, general fluorescence properties, etc., and achieve good water solubility and spectrum. The effect of performance, short reaction time and excellent fluorescence performance
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Embodiment 1
[0028] 50 mL of Zn(CH 3 COO) 2 2H 2 O solution was placed in a three-necked flask, and 1 mL of CdCl with a molar concentration of 0.005 mol / L was added 2 2.5H 2 O solution, 1 mL of Yb(NO 3 ) 3 ·5H 2 O solution, stirred evenly by magnetic force; pass high-purity nitrogen for half an hour, add 3 mL of glutathione (GSH) solution with a molar concentration of 0.1 mol / L to the above solution dropwise, and stir evenly by magnetic force;
[0029] Under the protection of nitrogen, use NaOH with a molar concentration of 0.05 mol / L to adjust the pH value of the solution to 10.5, and continue to magnetically stir evenly; slowly add 15 mL of NaOH with a concentration of 0.02 mol / L 2 S·9H 2 O solution, continue to stir for half an hour; place the solution in a water bath at 80° C., and the reaction time is 3 hours to obtain an aqueous solution of cadmium and ytterbium co-doped ZnS quantum dots. After the solution was cooled, an equal amount of absolute ethanol was added, and a whit...
Embodiment 2
[0031] 30 mL of Zn(CH 3 COO) 2 2H 2 O solution was placed in a three-necked flask, and 1 mL of CdCl with a molar concentration of 0.05 mol / L was added 2 2.5H 2 O solution, 1 mL of Yb(NO 3 ) 3 ·5H 2 O solution, stir evenly by magnetic force; pass high-purity nitrogen for half an hour, add 8 mL of glutathione (GSH) solution with a molar concentration of 0.1 mol / L to the above solution dropwise, stir evenly by magnetic force;
[0032] Under the protection of nitrogen, adjust the pH value of the solution to 11 with NaOH with a molar concentration of 0.05 mol / L, and continue to stir evenly with a magnetic force; slowly add 25 mL of NaOH with a concentration of 0.02 mol / L 2 S·9H 2 O solution, continue to stir for half an hour; put the solution in a water bath at 60° C., and the reaction time is 5 hours to obtain an aqueous solution of cadmium and ytterbium co-doped ZnS quantum dots. After the solution was cooled, an equal amount of absolute ethanol was added, and a white pre...
Embodiment 3
[0034] 50 mL of Zn(CH 3 COO) 2 2H 2 O solution was placed in a three-necked flask, and 1 mL of CdCl with a molar concentration of 0.01 mol / L was added 2 2.5H 2 O solution, 1 mL of Yb(NO 3 ) 3 ·5H 2 O solution, stir evenly by magnetic force; pass high-purity nitrogen for half an hour, add 10 mL of glutathione (GSH) solution with a molar concentration of 0.1 mol / L to the above solution dropwise, stir evenly by magnetic force;
[0035] Under the protection of nitrogen, adjust the pH value of the solution to 12 with NaOH with a molar concentration of 0.08 mol / L, and continue to magnetically stir evenly; slowly add 25 mL of NaOH with a concentration of 0.02 mol / L 2 S·9H 2 O solution, continue to stir for half an hour; put the solution in a water bath at 90° C., and the reaction time is 1 hour to obtain an aqueous solution of cadmium and ytterbium co-doped ZnS quantum dots. After the solution was cooled, an equal amount of absolute ethanol was added, and a white precipitate ...
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