Process for preparing water soluble CdTe/CdS nuclear/shell type quantum point by microwave radiation reaction

A water-soluble, quantum dot technology, applied in chemical instruments and methods, cadmium compounds, inorganic chemistry, etc., can solve the problems of long time (a few days to dozens of days, etc., achieve good water solubility, good stability, and easy raw materials) the effect

Inactive Publication Date: 2007-03-21
FUDAN UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Current reports on this aspect are limited to the common method of aqueous solution heating-assisted photodegradation (Gao MY, et. Chem Mater, 2004, 16, 3853-3859), but it takes a long time (several days to tens of days)

Method used

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  • Process for preparing water soluble CdTe/CdS nuclear/shell type quantum point by microwave radiation reaction
  • Process for preparing water soluble CdTe/CdS nuclear/shell type quantum point by microwave radiation reaction

Examples

Experimental program
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Effect test

Embodiment 1

[0018] (1). Preparation of sodium telluride hydride:

[0019] 90.5 mg NaBH 4 Put the solid and 91.2 mg of Te powder into a small flask, add 3 ml of water, and react at 10 degrees Celsius for 10 hours to obtain a NaHTe solution for later use;

[0020] (2) Preparation of CdTe quantum dots

[0021] 22.5 mg CdCl 2 Dissolve in 100 ml of water, add 0.03 ml of mercaptoacetic acid, adjust pH=9.5 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 hours to obtain CdTe quantum dot solution ;

[0022] (3) Preparation of CdTe / CdS precursor solution

[0023] 18.5 mg CdCl 2 and 5.6 mg Na 2 Dissolve S in 100 ml of water, add 0.06 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;

[0024] (4) Preparation of CdTe / CdS core / shell quantum dots by microwave irradiation

[0025] The obtained CdTe / C...

Embodiment 2

[0028] (1). Preparation of sodium telluride hydride

[0029] 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;

[0030] (2) Preparation of CdTe quantum dots

[0031] 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 ;

[0032] (3) Preparation of CdTe / CdS precursor solution

[0033] 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;

[0034] (4) Preparation of CdTe / CdS core / shell quantum dots by program-controlled microwave irradi...

Embodiment 3

[0038] (1). Preparation of potassium hydride telluride

[0039] 50.8 mg KBH 4 Put the solid and 63.8 mg of Te powder into a small flask, add 2 ml of water, and react at 20 degrees Celsius for 15 hours to obtain a KHTe solution for later use;

[0040] (2) Preparation of CdTe quantum dots

[0041] 25.6 mg CdCl 2 Dissolve in 100 ml of water, add 0.018 ml of mercaptoacetic acid, adjust pH=8.5 with 0.5 mol / L NaOH solution, pass nitrogen gas for 30 minutes, heat up to 90 degrees Celsius, inject 0.3 ml of KHTe solution, and react for 10 hours to obtain CdTe quantum dot solution ;

[0042](3) Preparation of CdTe / CdS precursor solution

[0043] 15.5 mg CdCl 2 and 5.0 mg Na 2 Dissolve S in 100 ml of water, add 0.02 ml of thioglycolic acid, adjust the pH to 9.5 with 0.5 mol / L NaOH solution, and inject 15 ml of CdTe quantum dot solution to obtain a CdTe / CdS precursor solution;

[0044] (4) Preparation of CdTe / CdS core / shell quantum dots by program-controlled microwave irradiation ...

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Abstract

A microwave process for preparing the water-soluble core / shell quantum point of CdTe / CdS with high fluorescent quantum efficiency includes such steps as mixing the salt or oxide of Cd with water-soluble mercapto compound in water phase, filling the solution of CdTe nanocrystal to obtain the precursor solution of CdTe / CdS, filling in glass tube, and microwave irradiating in microwave reactor.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and biological analysis and detection, and in particular relates to a microwave preparation method for water-soluble CdTe / CdS core / shell quantum dots with high fluorescence quantum efficiency. Using cadmium salt (or its oxide, hydroxide), sodium telluride hydride (or potassium telluride hydride, tellurium powder) and sodium sulfide (or potassium sulfide) as raw materials, the CdTe / CdS core / shell quantum point. 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 have wide excitation spectrum, narrow emission spectrum, and symmetry. The fluorescence emission wavelength...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/54C01G11/00
Inventor 黄维汪联辉范曲立何耀陆昊婷
Owner FUDAN UNIV
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