Water phase synthesis method of CaTe/Co(OH)2 core-shell structure magnetic fluorescence quantum point
A technology of fluorescent quantum dots and core-shell structure, which is applied in the field of aqueous phase synthesis of magnetic fluorescent quantum dots with CdTe/Co(OH) 2 core-shell structure, and achieves the effects of good water solubility and stability, easy connection and simple operation.
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Embodiment 1
[0015] 1. Preparation of sodium telluride hydride: 0.8 gram of sodium borohydride (NaBH 4 ) solid and 1.32 grams of Te powder were put into a small flask, and 20 milliliters of water were added. After reacting at 25 degrees Celsius for 8 hours, the solution was taken out and set aside.
[0016] 2. Prepare CdTe precursor solution: use water as solvent, mix 20 mmol / L CdCl 2 Mix with 20 mmol / L MPA (mercaptopropionic acid) in an equal volume ratio, and adjust the pH value to 11. Then inject NaHTe solution to a concentration of 1 mmol / L, and stir at 25° C. for 5 minutes to obtain a CdTe precursor solution.
[0017] 3. Microwave synthesis of CdTe fluorescent quantum dots: put the CdTe precursor solution in a closed polytetrafluoroethylene tank, and heat it in a microwave reactor with controllable temperature and pressure according to the following conditions to obtain CdTe fluorescent quantum dots. Sol solution. The microwave heating conditions are: microwave oscillation frequen...
Embodiment 2
[0020] 1. Preparation of potassium telluride hydride: 0.9 g of KBH 4 The solid and 1.32 g of Te powder were placed in a small flask, and 20 ml of water was added. After reacting at 25 degrees Celsius for 8 hours, the solution was taken out and set aside.
[0021] 2. Prepare CdTe precursor solution: use water as solvent, mix 8 mmol / L CdCl 2 Mix with 12 mmol / L MPA in an equal volume ratio, and adjust the pH value to 6. Then inject KHTe to a concentration of 0.4 mmol / L and stir for 10 minutes to obtain a CdTe precursor solution.
[0022] 3. Microwave synthesis of CdTe fluorescent quantum dots: the CdTe precursor solution is placed in a closed polytetrafluoroethylene tank, and heated in a temperature-controlled and pressure-controlled microwave reactor to obtain a sol solution of CdTe fluorescent quantum dots.
[0023] The microwave heating conditions are: microwave oscillation frequency 2450MHZ, microwave power 600W, heating time 2 hours, heating temperature 160 degrees Celsiu...
Embodiment 3
[0026] 1. Preparation of sodium telluride hydride: same as example 1.
[0027] 2. Preparation of CdTe precursor solution: using water as solvent, 1.2 mmol / L CdCl 2 Mix with 1 mmol / L TGA (thioglycolic acid) in an equal volume ratio, and adjust the pH value to 9. Then inject KHTe to a concentration of 0.4 mmol / L and stir for 10 minutes to obtain a CdTe precursor solution.
[0028] 3. Synthesis of CdTe fluorescent quantum dots in a water bath (oil bath): put the CdTe precursor solution in a 50ml flask for heating and reflux to obtain a sol solution of CdTe fluorescent quantum dots. Water bath (oil bath) heating conditions are: heating time 5 hours, heating temperature 100 degrees centigrade.
[0029] 4. Synthesis of CdTe / Co(OH) in water bath (oil bath) 2 Magnetic fluorescent quantum dots with core-shell structure: Inject the prepared cobalt solution into the sol solution of CdTe fluorescent quantum dots until the concentration of cobalt ions is 0.8 mmol / L, and continue heating...
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