Preparation method of ZnSe/ZnS core-shell quantum dots
A core-shell structure, quantum dot technology, applied in the synthesis field of fluorescent nanomaterials, can solve the problems of complex operation process, high condition requirements, ZnSe quantum dots do not have hydrophilicity, etc., to simplify the synthesis process, overcome the complex process, The effect of saving reaction time
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Embodiment 1
[0022] Below by embodiment, further illustrate outstanding feature of the present invention, only in order to illustrate the present invention and in no way limit the present invention.
[0023] A ZnSe / ZnS core-shell quantum dot, which consists of: selenium powder (Se), zinc acetate (Zn(Ac) 2 2H 2 O), thioglycolic acid (TGA), and the rest are aqueous solutions.
[0024] In the described ZnSe / ZnS core-shell structure quantum dots, selenium powder (Se), zinc acetate (Zn(Ac) 2 2H 2 O), the molar ratio of thioglycolic acid (TGA) is 1 / 10:1:2.4 respectively, and the ultraviolet lamp (254nm) of 30W is irradiated for 20-60h.
[0025] The pH value of the solution is 12.
[0026] A kind of illumination-assisted room temperature preparation method of ZnSe / ZnS core-shell structure quantum dots, its steps are:
[0027] 1. Prepare potassium selenium hydride solution by reducing selenium powder with potassium borohydride: weigh 0.3000g potassium borohydride and 0.1184g selenium powder r...
Embodiment 2
[0035] A ZnSe / ZnS core-shell quantum dot, which consists of: selenium powder (Se), zinc acetate (Zn(Ac) 2 2H 2 O), thioglycolic acid (TGA), and the rest are aqueous solutions.
[0036] In the described ZnSe / ZnS core-shell structure quantum dots, selenium powder (Se), zinc acetate (Zn(Ac) 2 2H 2 The molar ratios of O) and thioglycolic acid (TGA) were 1 / 5:1:2.4, respectively, and irradiated with a 30W ultraviolet lamp (254nm) for 48h.
[0037] The pH value of the solution is 13.
[0038] A method for preparing ZnSe / ZnS core-shell structure quantum dots at room temperature (20-25°C, the same below) under illumination, the steps of which are:
[0039] 1. Prepare potassium selenium hydride solution by reducing selenium powder with potassium borohydride: weigh 0.5000g potassium borohydride and 0.1974g selenium powder respectively in a test tube with a soft stopper, add 10mL deionized water to it, plug the stopper, and React in an ice bath for 2.5 hours to obtain a colorless and...
Embodiment 3
[0046] A kind of illumination-assisted room temperature preparation method of ZnSe / ZnS core-shell structure quantum dots, its steps are:
[0047] 1. Weigh 0.5000g of potassium borohydride and 0.1974g of selenium powder into a test tube with a soft stopper, add 5mL of deionized water to it, put the stopper on, and react in an ice bath for 3 hours to obtain a colorless transparent liquid of 0.50 The potassium selenide solution of mol / L;
[0048] 2. Weigh another 1.0975g Zn(Ac) 2 2H 2 O crystals were dissolved in 200mL deionized water to obtain a 0.025mol / L zinc acetate solution;
[0049] 3. Pipette 0.69mL of thioglycolic acid into the zinc acetate solution, and adjust the pH value to 14 with 5mol / L sodium hydroxide solution;
[0050] 4. Adjust the zinc acetate solution with a pH value of 14 to pass nitrogen for half an hour to remove dissolved oxygen, quickly add 2mL of 0.50mol / L potassium selenium hydride solution, and continue to pass nitrogen for 45-30min to make it fully ...
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