Preparation method of water soluble CdTe/CdS nuclear/shell type quantum point

A water-soluble, quantum dot technology, applied in the direction of fluorescence/phosphorescence, material inspection products, microstructure technology, etc., can solve the problems of low quantum efficiency and long time of fluorescence of CdTe nanocrystals, and achieve good water solubility, good stability, Operational Security Effects

Inactive Publication Date: 2006-06-28
方圆环球光电技术盐城有限公司
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Problems solved by technology

Current reports on this aspect are limited to the common method of heating assisted photodegradation in aqueous solution (Gao M., et.Chem Mater, 2004, 16, 3853-3859), but the fluorescent quantum efficiency of CdTe nanocrystals obtained by common aqueous heating is very low. Low (approximately ~10%), resulting in a long time (>15 days) to obtain high fluorescence quantum efficiency (>50%) CdTe / CdS core / shell structure nanocrystals by photodegradation, and the light source used is a low-pressure mercury lamp

Method used

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  • Preparation method of water soluble CdTe/CdS nuclear/shell type quantum point
  • Preparation method of water soluble CdTe/CdS nuclear/shell type quantum point

Examples

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Effect test

Embodiment 1

[0017] (1) Preparation of sodium telluride hydride

[0018] 71.0 mg NaBH 4 Put the solid and 95.2 mg of Te powder into a small flask, add 3 ml of water, and react at 10 degrees Celsius for 12 hours to obtain a NaHTe solution for use;

[0019] (2) Preparation of CdTe precursor solution

[0020] 22.9 mg CdCl 2 Dissolve in 100 ml of water, add 13.5 microliters of mercaptoacetic acid, adjust the pH to 11.5 with 0.5 mol / L NaOH solution, inject 0.25 ml of NaHTe solution as the CdTe precursor solution;

[0021] (3) Program controlled microwave irradiation to prepare CdTe quantum dots

[0022] The obtained CdTe precursor solution is subjected to program-controlled microwave radiation to obtain CdTe quantum dots. The program control conditions are as follows:

[0023] The first program microwave power: 50W; the first program temperature: 70°C; the first program time: 45s;

[0024] Second program microwave power: 80W; second program temperature: 80°C; second program time: 20min. ...

Embodiment 2

[0028] (1) Preparation of potassium hydride telluride

[0029] 95.5 mg KBH 4 Put the solid and 82.5 mg of Te powder into a small flask, add 3 ml of water, and react at 5 degrees Celsius for 15 hours to obtain a KHTe solution for subsequent use;

[0030] (2) Preparation of CdTe precursor solution

[0031] 19 mg CdCl 2 Dissolve in 100 ml of water, add 9.7 microliters of mercaptoacetic acid, adjust the pH to 11 with 0.5 mol / L NaOH solution, inject 0.20 ml of KHTe solution as the CdTe precursor solution;

[0032] (3) Program controlled microwave irradiation to prepare CdTe quantum dots

[0033] The obtained CdTe precursor solution is subjected to program-controlled microwave radiation to obtain CdTe quantum dots. The program control conditions are as follows:

[0034] The first program microwave power: 50W; the first program temperature: 80°C; the first program time: 1min;

[0035] Second program microwave power: 200W; second program temperature: 100°C; second program time: ...

Embodiment 3

[0039] (1) Preparation of sodium telluride hydride

[0040] 92.7 mg NaBH 4 Put the solid and 127.6 mg of Te powder into a small flask, add 3 ml of water, and react at 15 degrees Celsius for 7 hours to obtain a NaHTe solution for use;

[0041] (2) Preparation of CdTe precursor solution

[0042] 30 mg CdCl 2 Dissolve in 100 ml of water, add 15.0 microliters of mercaptoacetic acid, adjust the pH to 9 with 0.5 mol / l NaOH solution, inject 0.3 ml of NaHTe solution as the CdTe precursor solution;

[0043] (3) Program controlled microwave irradiation to prepare CdTe quantum dots

[0044]The obtained CdTe precursor solution is subjected to program-controlled microwave radiation to obtain CdTe quantum dots. The program control conditions are as follows:

[0045] The first program microwave power: 70W; the first program temperature: 70°C; the first program time: 60s;

[0046] Second program microwave power: 300W; second program temperature: 110°C; second program time: 5min.

[004...

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Abstract

A method for preparing water soluble quantum of CbTe / CbS core / shell type includes mixing Cb salt with water soluble thioglycollic acid in water phase, injecting Te ¿C sodium hydride to obtain CbTe forebody solution, filling said solution into glass tube specially being used in microwave radiation, carrying out program ¿C controlled microwave radiation on forebody solution in said tube to prepare CbTe quantum point, obtaining water soluble CbTe / CbS core / shell quantum point with high fluorescent quantum efficiency by making light degradation on CbTe quantum point.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation and biological analysis and detection, and in particular relates to a photodegradation-assisted program-controlled microwave preparation method for water-soluble CdTe / CdS core / shell quantum dots with high fluorescence quantum efficiency. CdTe / CdS core / shell quantum dots are prepared by using cadmium salt (or its oxide, hydroxide), sodium telluride hydride (or potassium telluride hydride, tellurium powder) and mercaptoacetic acid as raw materials, using photodegradation-assisted program control microwave technology Methods. technical background [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. Semiconductor nanocrystals have a quantum size effect, and their optical properties change with particle size. At the same time, their luminous efficiency is also greatly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/52B81C99/00G01N21/64
Inventor 何耀黄维汪联辉范曲立陆昊婷赛丽曼赖文勇
Owner 方圆环球光电技术盐城有限公司
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