Method for synthesizing rare earth Er-doped CdTe:Er quantum dot by hydrothermal method
A technology of quantum dots and hydrothermal method, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem of poor fluorescence stability of CdTe quantum dots, high toxicity and volatile nature of CdTe quantum dots No foul odor and other problems, to achieve the effect of adjustable fluorescence emission wavelength, low cost, simple and convenient operation
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Embodiment 1
[0019] A kind of hydrothermal synthesis rare earth Er doped CdTe: the method of Er quantum dot, its step is as follows:
[0020] 1. Preparation of sodium telluride hydride NaHTe solution:
[0021] Put 0.2mmol tellurium powder and 0.4mmol sodium borohydride into a two-necked flask, add 5mL distilled water, protect with nitrogen, stir and react at 70°C for 60min to obtain sodium telluride hydride NaHTe solution for later use;
[0022] 2. Preparation of rare earth Er-doped CdTe:Er quantum dots
[0023] 0.02mmol CdCl 2 , 0.001 mmol Er 2 o 3 Dissolve 0.02mmol N-acetyl-L-cysteine in 40mL distilled water, adjust the pH value to 7.0 with 1mol / L NaOH solution, blow nitrogen to remove oxygen, add 50mL sodium telluride hydride NaHTe solution prepared in step 1, and mix well Afterwards, it was transferred to a hydrothermal reaction kettle and heated to 180° C. to react for 60 minutes to obtain 40 mL of rare earth Er-doped CdTe:Er quantum dot solution with adjustable fluorescence emi...
Embodiment 2
[0025] A kind of hydrothermal synthesis rare earth Er doped CdTe: the method of Er quantum dot, its step is as follows:
[0026] 1. Preparation of sodium telluride hydride NaHTe solution
[0027] Put 0.4mmol tellurium powder and 1.2mmol sodium borohydride into a two-necked flask, add 4mL distilled water, protect with nitrogen, stir and react at 90°C for 30min to obtain sodium telluride hydride NaHTe solution for later use;
[0028] 2. Preparation of rare earth Er-doped CdTe:Er quantum dots
[0029] 0.4mmol CdBr 2 , 0.06mmol Er 2 o 3 Dissolve 0.8mmol N-acetyl-L-cysteine in 20mL distilled water, adjust the pH value to 8.0 with 1mol / L NaOH solution, blow nitrogen to remove oxygen, add 2mL sodium telluride hydride NaHTe solution prepared in step 1, mix well Afterwards, it was transferred to a hydrothermal reaction kettle and heated to 190° C. for 30 minutes to obtain 22 mL of rare earth Er-doped CdTe:Er quantum dot solution with adjustable fluorescence emission wavelength an...
Embodiment 3
[0031] A kind of hydrothermal synthesis rare earth Er doped CdTe: the method of Er quantum dot, its step is as follows:
[0032] 1. Preparation of sodium telluride hydride NaHTe solution
[0033] Put 1.12mmol tellurium powder and 5.60mmol sodium borohydride into a two-necked flask, add 8mL distilled water, protect with nitrogen, stir and react at 100°C for 10min, and obtain sodium telluride hydride NaHTe solution for later use;
[0034] 2. Preparation of rare earth Er-doped CdTe:Er quantum dots
[0035] 1.4mmol CdI 2 , 0.56 mmol Er 2 o 3 Dissolve 4.2mmol of N-acetyl-L-cysteine in 70mL of distilled water, adjust the pH value to 10.0 with 1mol / L NaOH solution, blow nitrogen to remove oxygen, add 8mL of sodium telluride hydride NaHTe solution prepared in step 1, and mix well Afterwards, it was transferred to a hydrothermal reaction kettle and heated to 200° C. for 5 minutes to obtain 78 mL of rare earth Er-doped CdTe:Er quantum dot solution with adjustable fluorescence emis...
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