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Method for preparing water soluble CdTe/ZnSe nucleocapsid quanta point in high fluorescent yield

A core-shell quantum dot, fluorescence yield technology, applied in chemical instruments and methods, luminescent materials, etc., to achieve high fluorescence quantum yield, good water solubility and stability, and low toxicity.

Inactive Publication Date: 2005-10-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the defects of the current method for synthesizing quantum dots in the organic phase, and propose a new method for synthesizing CdTe / ZnSe quantum dots in the water phase, which has the advantages of mild synthesis conditions, high product fluorescence yield, good stability, and water solubility. Good, low toxicity, easy to connect with organisms, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1). Preparation of sodium telluride hydride

[0024] Put 0.8 g of solid sodium borohydride and 0.16 g of tellurium powder into a small flask, and add 10 ml of water. After reacting at 25 degrees Celsius for 2 hours, a sodium telluride hydride solution was generated, which was taken out and set aside.

[0025] (2). Preparation of sodium selenium hydride

[0026] Put 0.8 g of sodium borohydride solid and 0.8 g of selenium powder into a small flask, and add 10 ml of water. After reacting at 25 degrees Celsius for 2 hours, a sodium selenium hydride solution was generated, and the solution was taken out for later use.

[0027] (3). Synthesis of CdTe quantum dots in the water phase by heating in a water bath

[0028] Using water as a solvent, mix 20 mmol / L cadmium chloride and 20 mmol / L mercaptopropionic acid in an equal volume ratio, and adjust the pH value to 11. Then, sodium telluride hydride solution was injected to a concentration of 1 mmol / L to obtain a CdTe precur...

Embodiment 2

[0036] (1). Preparation of potassium hydride telluride

[0037] Put 0.8 g of solid potassium borohydride and 0.16 g of tellurium powder into a small flask, and add 10 ml of water. After reacting at 25 degrees centigrade for 2 hours, a potassium hydride telluride solution was generated, and the solution was taken out for later use.

[0038] (2). Preparation of potassium selenide

[0039] Put 0.8 g of potassium borohydride solid and 0.8 g of selenium powder into a small flask, and add 10 ml of water. After reacting at 25 degrees centigrade for 2 hours, a potassium selenide solution was generated, which was taken out and set aside.

[0040] (3). Synthesis of CdTe quantum dots in the water phase by heating in a water bath

[0041] Using water as a solvent, mix 2 mmol / L cadmium chloride and 2 mmol / L mercaptopropionic acid in an equal volume ratio, and adjust the pH value to 9. Then potassium hydride telluride solution was injected to a concentration of 1 mmol / L to obtain a CdTe...

Embodiment 3

[0049] (1). Preparation of sodium telluride hydride

[0050] Put 0.8 g of solid sodium borohydride and 0.16 g of tellurium powder into a small flask, and add 10 ml of water. After reacting at 25 degrees Celsius for 2 hours, a sodium telluride hydride solution was generated, which was taken out and set aside.

[0051] (2). Preparation of potassium selenide

[0052] Put 0.8 g of potassium borohydride solid and 0.8 g of selenium powder into a small flask, and add 10 ml of water. After reacting at 25 degrees centigrade for 2 hours, a potassium selenide solution was generated, which was taken out and set aside.

[0053] (3). Synthesis of CdTe quantum dots in the water phase by heating in a water bath

[0054] Using water as a solvent, mix 40 mmol / L cadmium chloride and 50 mmol / L mercaptopropionic acid in an equal volume ratio, and adjust the pH value to 7. Then, sodium telluride hydride solution was injected to a concentration of 10 mmol / L to obtain a CdTe precursor solution. ...

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Abstract

The present invention relates to a method for preparing CeTe / ZnSe core-shell quantum point with water solubility and high fluorescence yield. Said method uses water as solvent, and adopts the following steps: mixing cadmium salt or cadmium oxide and water-soluble mercaptocompound, injection sodium hydrogen telluride or potassium hydrogen telluride produced by adopting sodium borohydride or potassium borohydride and selenium powder and making them be reacted to obtain cadmium telluride precursor solution, then heating said solution in water bath under the protection of nitrogen gas to synthesize cadmium telluride fluorescence quantum point, then making purification and injecting ZnSe monomer, water bath heating and synthesizing CdTe / ZnSe core-shell type quantum point.

Description

technical field [0001] The invention relates to a method for preparing water-soluble and high-yield CdTe / ZnSe core-shell quantum dots, belonging to the fields of nanomaterial preparation technology and biological analysis and detection technology. Background technique [0002] Quantum dots, also known as semiconductor nanocrystals, are nanoparticles composed of II-VI or III-V elements. Compared with organic fluorescent dyes, it has unique photoluminescent properties, such as wide excitation wavelength range, narrow emission wavelength range, large Stokes shift, high quantum yield, long fluorescence lifetime, and not easy to photolyze or drift. . It has broad application prospects in the preparation of optoelectronic devices and the field of life sciences. For example, CdS, CdSe, CdTe and other emission spectra span the visible spectral region. At present, people have connected these quantum dots with biomacromolecules to form bioluminescent probes, which are used in immune...

Claims

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Application Information

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IPC IPC(8): C09K11/54
Inventor 任吉存钱惠锋李良
Owner SHANGHAI JIAO TONG UNIV
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