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Method of preparing CdTe/CdS/ZnS core-shell-core structure quantum points

A quantum dot and shell structure technology, applied in chemical instruments and methods, material inspection products, luminescent materials, etc., to achieve the effects of safe operation, easy availability of raw materials, excellent photostability and biocompatibility

Inactive Publication Date: 2007-11-28
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current reports on this aspect are limited to organic phase methods (Talapin D.V., et.J.Phys.Chem.B 2004, 118, 18826-18831.), there is no case of CdTe / CdS / ZnS core-shell-shell structure quantum dots Can be prepared directly from the aqueous phase

Method used

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  • Method of preparing CdTe/CdS/ZnS core-shell-core structure quantum points
  • Method of preparing CdTe/CdS/ZnS core-shell-core structure quantum points

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1). Preparation of sodium telluride hydride:

[0022] 98 mg NaBH 4 Put the solid and 115.6 mg of Te powder into a small flask, add 3 ml of water, and react at 15 degrees Celsius for 11 hours to obtain a NaHTe solution for subsequent use;

[0023] (2) Preparation of CdTe quantum dots

[0024] 25.0 mg CdCl 2 Dissolve in 100 ml of water, add 0.02 ml of mercaptoacetic acid, adjust pH=10.5 with 0.5 mol / L NaOH solution, pass nitrogen gas for 30 minutes, heat up to 100 degrees Celsius, inject 0.2 ml of NaHTe solution, and react for 3.5 hours to obtain CdTe quantum dot solution ;

[0025] (3) Preparation of CdTe / CdS precursor solution

[0026] 16.5 mg CdCl 2 and 3.6 mg Na 2 Dissolve S in 100 ml of water, add 0.01 ml of thioglycolic acid, adjust the pH to 10.5 with 0.5 mol / L NaOH, inject 10 ml of CdTe quantum dot solution, and obtain a CdTe / CdS precursor solution;

[0027] (4) Preparation of CdTe / CdS core / shell quantum dots by microwave irradiation

[0028] The obtained...

Embodiment 2

[0034] (1). Preparation of potassium hydride telluride:

[0035]83.5 mg KBH 4 Put the solid and 92.6 mg of Te powder into a small flask, add 3 ml of water, and react at 10 degrees Celsius for 15 hours to obtain a KHTe solution for later use;

[0036] (2) Preparation of CdTe quantum dots

[0037] 26.9 mg CdCl 2 Dissolve in 100 ml of water, add 0.07 ml of mercaptoacetic acid, adjust pH = 11.0 with 0.5 mol / L NaOH solution, pass nitrogen gas for 30 minutes, heat up to 100 degrees Celsius, inject 0.2 ml of KHTe solution, and react for 5 hours to obtain CdTe quantum dot solution ;

[0038] (3) Preparation of CdTe / CdS precursor solution

[0039] 30.5 mg CdCl 2 and 7.8 mg Na 2 Dissolve S in 100 ml of water, add 0.05 ml of thioglycolic acid, adjust the pH to 7.5 with 0.5 mol / L NaOH, inject 10 ml of CdTe quantum dot solution, and obtain a CdTe / CdS precursor solution;

[0040] (4) Preparation of CdTe / CdS core / shell quantum dots by microwave irradiation

[0041] The obtained CdTe / ...

Embodiment 3

[0047] (1). Preparation of sodium telluride hydride

[0048] 90.7 mg NaBH 4 Put the solid and 127.6 mg of Te powder into a small flask, add 2.5 ml of water, and react at 0 degrees Celsius for 8 hours to obtain a NaHTe solution for subsequent use;

[0049] (2) Preparation of CdTe quantum dots

[0050] 30.0 mg CdCl 2 Dissolve in 100 ml of water, add 0.05 ml of mercaptoacetic acid, adjust the pH to 9.0 with 0.5 mol / L NaOH solution, pass nitrogen gas for 30 minutes, heat up to 100 degrees Celsius, inject 0.25 ml of NaHTe solution, and react for 5 hours to obtain a CdTe quantum dot solution ;

[0051] (3) Preparation of CdTe / CdS precursor solution

[0052] 25.9 mg CdCl 2 and 3.9 mg Na 2 Dissolve S in 100 ml of water, add 0.03 ml of mercaptoacetic acid, adjust pH=8 with 0.5 mol / L NaOH solution, inject 20 ml of CdTe quantum dot solution, and obtain a CdTe / CdS precursor solution;

[0053] (4) Preparation of CdTe / CdS core / shell quantum dots by program-controlled microwave irradi...

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Abstract

The present invention belongs to the field of nanometer material and biological analysis and detection technology, and is especially preparation process of water soluble CdTe / CdS / ZnS quantum dot in core-shell-shell structure. The preparation process includes mixing zinc salt or zinc oxide with water soluble sulfhydryl compound in water phase, injecting prepared solution of CdTe / CdS in core-shell structure to obtain CdTe / CdS / ZnS precursor solution, setting the precursor solution in a glass tube and performing microwave radiation reaction in a microwave reactor to obtain CdTe / CdS / ZnS quantum dot in core-shell-shell structure. The process is completed in water phase, and is safe and simple. The CdTe / CdS / ZnS quantum dot in core-shell-shell structure has high fluorescence quantum efficiency, high water solubility, excellent stability and high biocompatibility, and may be applied widely in fluorescent marker for biological analysis and detection.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation technology and biological analysis and detection technology, and in particular relates to a preparation method of water-soluble CdTe / CdS / ZnS core-shell-shell structure quantum dots with high fluorescence quantum efficiency. Using cadmium salt (or its oxide, hydroxide), zinc salt (or its oxide), sodium hydride tellurium (or potassium hydride tellurium, tellurium powder) and sodium sulfide (or potassium sulfide) as raw materials, using microwave technology Preparation of CdTe / CdS / ZnS core-shell-shell quantum dots. Background technique [0002] Quantum dots are a type of semiconductor nanocrystal grains composed of II-VI or III-V elements whose radius is smaller than or close to the exciton Bohr radius. Quantum dots have unique quantum size effects and surface effects. Compared with traditional fluorescent dye molecules using nanocrystals as markers, they have many advantages: nanocrystals ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88G01N33/52
Inventor 汪联辉何耀陆昊婷赛丽曼
Owner FUDAN UNIV
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