Process for preparing water soluble cadmium telluride quantum point with program controlling microwave

A cadmium telluride quantum dot, water-soluble technology, applied in the field of nanomaterials and biological analysis and detection, can solve the problems of long reaction time (several hours to tens of hours, increased surface defects of quantum dots, low luminous efficiency of quantum dots, etc.) Achieving the effects of good water solubility, high fluorescence properties, high quantum yield, and safe and easy availability of raw materials

Inactive Publication Date: 2005-11-09
FUDAN UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

The preparation of water-soluble quantum dots reported at present mainly contains common aqueous solution heating method (Rogach A.L, et.J.Phys.Chem.B, 2002,106,7177-7185; Rogach A.L, et.Adv.Mater, 2001,13 , 1684-1687), but this method requires low temperature (≤100°C) and long reaction time (several hours to dozens of hours) to prepare quantum dots, which increases the surface defects of quantum dots, which leads to the luminous efficiency of quantum dots. Low, half width of fluorescence spectrum is too wide

Method used

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  • Process for preparing water soluble cadmium telluride quantum point with program controlling microwave
  • Process for preparing water soluble cadmium telluride quantum point with program controlling microwave

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Embodiment 1

[0015] (1). Preparation of sodium telluride hydride:

[0016] 80 mg NaBH 4 Put the solid and 91.2 mg of Te powder into a small flask, add 2 ml of water, and react at 10 degrees Celsius for 10 hours to obtain a NaHTe solution for use;

[0017] (2) Preparation of CdTe precursor solution

[0018] 21.9 mg CdCl 2 Dissolve in 100 ml of water, add 0.03 ml of thioglycolic acid, adjust the pH to 10 with 0.5 mol / L NaOH solution, inject 0.2 ml of NaHTe solution as the CdTe precursor solution;

[0019] (3) Program controlled microwave irradiation to prepare CdTe quantum dots

[0020] The obtained CdTe precursor solution is subjected to program-controlled microwave radiation to obtain CdTe quantum dots. The program control conditions are as follows:

[0021] The first program microwave power: 50W; the first program temperature: 70°C; the first program time: 30s;

[0022] Second program microwave power: 100W; second program temperature: 120°C; second program time: 1min.

Embodiment 2

[0024] (1). Preparation of sodium telluride hydride

[0025] 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;

[0026] (2) Preparation of CdTe precursor solution

[0027] 30 mg CdCl 2 Dissolve in 100 ml of water, add 0.03 ml of mercaptoacetic acid, adjust pH=9 with 0.5 mol / L NaOH solution, inject 0.3 ml of NaHTe solution as CdTe precursor solution;

[0028] (3) Program controlled microwave irradiation to prepare CdTe quantum dots

[0029] The obtained CdTe precursor solution is subjected to program-controlled microwave radiation to obtain CdTe quantum dots. The program control conditions are as follows:

[0030] The first program microwave power: 70W; the first program temperature: 80°C; the first program time: 60s;

[0031] Second program microwave power: 300W; second program temperature: 110°C; second program time: 5min.

Embodiment 3

[0033] (1). Preparation of potassium hydride telluride:

[0034] 110.5 mg KBH 4 Put the solid and 91.6 mg of Te powder into a small flask, add 3 ml of water, and react at 0 degrees Celsius for 20 hours to obtain a KHTe solution for later use;

[0035] (2) Preparation of CdTe precursor solution

[0036] 36.8 mg CdCl 2 Dissolve in 100 ml of water, add 0.05 ml of mercaptoacetic acid, adjust the pH to 11.0 with 0.5 mol / L NaOH solution, inject 0.30 ml of KHTe solution as the CdTe precursor solution;

[0037] (3) Program controlled microwave irradiation to prepare CdTe quantum dots

[0038] The obtained CdTe precursor solution is subjected to program-controlled microwave radiation to obtain CdTe quantum dots. The program control conditions are as follows:

[0039] The first program microwave power: 70W; the first program temperature: 90°C; the first program time: 30s;

[0040] Second program microwave power: 500W; second program temperature: 100°C; second program time: 10min. ...

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Abstract

A program controlled microwave processes for preparing the quantum point of water-soluble CdTe includes such steps as mixing Cd salt (or oxide) with water-soluble mercapto compound in water phase, adding sodium (or potassium) tellurohydride to obtain the precursor solution, filling it in glass tube, and program controlled microwave irradiating in microwave reactor.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and biological analysis and detection, and in particular relates to a program-controlled microwave preparation method of water-soluble cadmium telluride quantum dots. Using cadmium salt (or its oxide, hydroxide) and sodium tellurium hydride (or potassium telluride hydride, tellurium powder) as raw materials, the CdTe quantum dots are prepared by program-controlled microwave technology. 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 improved compared with bulk materials. In 1998, Alivisatos and Nie SM first reported the use of semiconductor nanocrystals instead of organic flu...

Claims

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Application Information

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