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Water phase synthesis method for diluted magnetic fluorescent cobalt-doped cadmium selenide alloy quantum dot

A quantum dot and cadmium selenide technology, which is applied in the field of biological analysis and detection, achieves the effects of good water solubility and stability, simple operation, and high fluorescence quantum yield

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

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to aim at the defect of current organic phase synthesis method, propose a kind of aqueous phase synthesis method of dilute magnetic fluorescence cobalt-doped cadmium selenide alloy quantum dot, this method has synthesis speed fast, product Cd x co 1-x Se has 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

[0014] (1). Preparation of sodium selenium hydride

[0015] 0.8 g NaBH 4 The solid and 1.32 grams of Se powder were placed in a small flask, and 20 milliliters of water was added. After reacting at 25 degrees Celsius for 8 hours, the solution was taken out and set aside.

[0016] (2).Microwave synthesis of Cd x co 1-x Se Diluted Magnetic Fluorescent Quantum Dots

[0017] With water as solvent, 20 mmol / L CdCl 2 , 20 mmol / L Co(NO 3 ) 2 Mix with 20 mmol / L mercaptopropionic acid (MPA) in an equal volume ratio, and adjust the pH value to 11. Then inject sodium selenium hydride NaHSe solution to a concentration of 1 mmol / L, and stir at 25 degrees Celsius for 5 minutes to obtain Cd x co 1-x Se precursor mixed solution. This solution is placed in a closed polytetrafluoroethylene tank, and heated in a temperature-controlled and pressure-controlled microwave reactor according to the following conditions to obtain Cd x co 1-x Se-diluted magnetic fluorescent quantum dots.

[...

Embodiment 2

[0020] (1). Preparation of potassium selenide

[0021] 0.9 g KBH 4 The solid and 1.32 grams of Se powder were placed in a small flask, and 20 milliliters of water was added. After reacting at 25 degrees Celsius for 8 hours, the solution was taken out and set aside.

[0022] (2).Microwave synthesis of Cd x co 1-x Se Diluted Magnetic Fluorescent Quantum Dots

[0023] With water as solvent, 8 mmol / L CdCl 2 , 20 mmol / L Co(NO 3 ) 2 Mix with 12 mmol / L MPA in an equal volume ratio, and adjust the pH value to 6. Then inject KHSe to a concentration of 0.4 mmol / L and stir for 10 minutes to obtain Cd x co 1-x Se precursor mixed solution. This solution is placed in a closed polytetrafluoroethylene tank, and heated in a temperature-controllable and pressure-controllable microwave reactor according to the following conditions to obtain Cd x co 1-x Se-diluted magnetic fluorescent quantum dots.

[0024] The microwave heating conditions are: microwave oscillation frequency: 2450MH...

Embodiment 3

[0026] (1). Sodium Selenium Hydride is prepared the same as Example 1.

[0027] (2). Synthesis of Cd in water bath (oil bath) x co 1-x Se Diluted Magnetic Fluorescent Quantum Dots

[0028] With water as solvent, 20 mmol / L CdCl 2 , 20 mmol / L Co(NO 3 ) 2 Mix with 20 mmol / L MPA in an equal volume ratio, and adjust the pH value to 11. Then inject NaHSe solution to a concentration of 1 mmol / L and stir at 25 °C for 5 minutes to obtain Cd x co 1-x Se precursor mixed solution. Put this solution in a 50ml flask, and heat to reflux according to the following conditions to obtain Cd x co 1-x Se-diluted magnetic fluorescent quantum dots.

[0029] The water bath (oil bath) heating conditions are: heating time: 5 hours, heating temperature: 100 degrees Celsius.

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Abstract

A kind of aqueous phase synthetic method of dilute magnetic fluorescent cobalt-doped cadmium selenide alloy quantum dot, with water as solvent, cadmium salt (or the oxide of cadmium, the hydroxide of cadmium), cobalt salt (or the oxide of cobalt, Hydroxide of cobalt) mixed with water-soluble mercapto compound, inject sodium selenide or potassium selenium hydride generated by the reaction of sodium borohydride or potassium borohydride and selenium powder, to obtain Cd x co 1-x Se precursor solution, and then use temperature-controlled microwave or water bath (oil bath) heating reaction to obtain Cd x co 1-x Se-diluted magnetic fluorescent quantum dots. The present invention controls the magnetic intensity of quantum dot by controlling the amount of cobalt doping, by controlling Cd x co 1-x The synthesis time of Se quantum dots is used to control the luminous range of quantum dots. The method of the invention is simple to operate, mild in conditions, low in cost, and the synthetic product Cd x co 1-x Se has the characteristics of good water solubility and stability, high fluorescence quantum yield, tunable magnetic properties and emission spectra, and easy connection with biological macromolecules.

Description

technical field [0001] The invention relates to a water-phase synthesis method of dilute magnetic fluorescent cobalt-doped cadmium selenide alloy quantum dots, which uses cadmium salt (or its oxide, hydroxide), cobalt salt (or its oxide, hydroxide) and selenium Sodium hydride or hydrogen selenide is used as raw material, and Cd is prepared in water phase by microwave heating or water bath (oil bath). x co 1-x The Se dilute magnetic fluorescent quantum dot belongs to the field 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 and CdSe belong to two common types. Compared with organic fluorescent dyes, this material has unique photoluminescent properties, such as wide excitation wavelength range, narrow emission wavelength range, l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/60C09K11/54H01F1/00
Inventor 任吉存李良
Owner SHANGHAI JIAO TONG UNIV
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