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.

Inactive Publication Date: 2006-05-17
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a kind of aqueous phase synthesis CdTe / Co(OH) for the defect of current organic phase synthesis method 2 A new method for quantum dots with core-shell structure. The prepared fluorescent magnetic quantum dots have the advantages of good water solubility, strong magnetism, high quantum yield, and easy connection with biological macromolecules.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

A CdTe / Co(OH) 2 The aqueous phase synthesis method of magnetic fluorescent quantum dots with core-shell structure uses water as a solvent, mixes cadmium salt or cadmium oxide with a water-soluble mercapto compound, and injects hydrogen telluride generated by the reaction of sodium borohydride or potassium borohydride with tellurium powder. Sodium or potassium tellurium hydride to obtain a CdTe precursor solution, and then use temperature-controlled microwave or water bath (oil bath) to heat the reaction to obtain a sol solution of CdTe fluorescent quantum dots. After injecting cobalt salt aqueous solution, continue heating to obtain a Co / CdTe core-shell structure magnetic Fluorescent quantum dots. The invention controls the magnetic strength of the quantum dots by controlling the amount of cobalt added, and controls the luminescence range of the CdTe quantum dots by controlling the synthesis time and the heating time after cobalt injection. The synthetic product CdTe / Co(OH) of the present invention 2 The core-shell structure has the characteristics of good water solubility and stability, high fluorescence quantum yield, adjustable magnetic properties and emission spectra, and easy connection with biological macromolecules.

Description

technical field [0001] The present invention relates to a kind of CdTe / Co(OH) 2 The aqueous phase synthesis method of core-shell structure magnetic fluorescent quantum dot is based on cadmium salt (or its oxide, hydroxide), cobalt salt (or its oxide, hydroxide) and sodium telluride or potassium telluride (telluride) powder), using hydrogen telluride as raw material, using water bath (oil bath) or microwave heating to prepare CdTe / Co(OH) in water phase 2 The magnetic fluorescent quantum dot with a core-shell structure belongs to the fields of nanometer material, magnetic material, photoelectric material preparation technology and biological analysis and detection technology. Background technique [0002] Quantum dots, also known as semiconductor nanocrystals, are nanoparticles composed of IIB-VIA or IIIB-VA group elements, and CdTe is one of them. Compared with organic fluorescent dyes, this material has unique photoluminescent properties, such as wide excitation wavelength...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K9/00
Inventor 任吉存李良钱惠锋
Owner SHANGHAI JIAOTONG UNIV
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