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Preparation method of size-adjustable CdS quantum dot

A technology of quantum dots and cadmium sulfide, which is applied in the field of preparation of cadmium sulfide quantum dots, can solve the problems of complex preparation device, unadjustable, single size of quantum dots, etc., and achieves the effect of simplifying the preparation process

Inactive Publication Date: 2011-06-01
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, the quantum dots obtained by these methods have a single size and are generally not adjustable.
[0005] Since these methods all need to be reacted at a higher temperature, and some also need to be carried out under high pressure, the corresponding preparation device is more complicated, which increases the cost of preparation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The first step, 0.64g cadmium chloride and 0.92g ammonium chloride are dissolved in 500ml deionized water, add ammonia water, adjust the pH value of solution to 9, be equivalent to cadmium chloride: ammonium chloride: the molar ratio of deionized water 1:3:4848, A solution was obtained;

[0019] In the second step, 2.44g of thiourea is dissolved in 100ml of deionized water, and 0.40ml of mercaptoethanol is added dropwise, which is equivalent to thiourea: mercaptoethanol: the molar ratio of deionized water is 7: 1.2: 1213, to obtain B solution;

[0020] The third step is to mix the A solution obtained in the first step with the B solution obtained in the second step, place it in a water bath, and react for 1 hour at 36 ° C and normal pressure, and the cadmium sulfide prepared in the milky white aqueous solution quantum dots;

[0021] The fourth step is to filter the milky white solution obtained in the third step with filter paper to obtain a powdery substance, rinse th...

Embodiment 2

[0023] The first step, 0.64g cadmium chloride and 0.92g ammonium chloride are dissolved in 500ml deionized water, add ammonia water, adjust the pH value of solution to 9, be equivalent to cadmium chloride: ammonium chloride: the molar ratio of deionized water 1:3:4848, A solution was obtained;

[0024] In the second step, 2.44g of thiourea is dissolved in 100ml of deionized water, and 0.30ml of mercaptoethanol is added dropwise, which is equivalent to thiourea: mercaptoethanol: the molar ratio of deionized water is 7: 0.93: 1213, to obtain B solution;

[0025] The third step is to mix the A solution obtained in the first step with the B solution obtained in the second step, place it in a water bath, and react for 1 hour at 36 ° C and normal pressure, and the cadmium sulfide prepared in the milky white aqueous solution quantum dots;

[0026] The fourth step is to filter the milky white solution obtained in the third step with filter paper to obtain a powdery substance, rinse t...

Embodiment 3

[0028] The first step, 0.64g cadmium chloride and 0.92g ammonium chloride are dissolved in 500ml deionized water, add ammonia water, adjust the pH value of solution to 9, be equivalent to cadmium chloride: ammonium chloride: the molar ratio of deionized water 1:3:4848, A solution was obtained;

[0029] In the second step, 2.44g of thiourea is dissolved in 100ml of deionized water, and 0.15ml of mercaptoethanol is added dropwise, which is equivalent to thiourea: mercaptoethanol: the molar ratio of deionized water is 7: 0.46: 1213, to obtain B solution;

[0030] The third step is to mix the A solution obtained in the first step with the B solution obtained in the second step, place it in a water bath, and react for 1 hour at 36 ° C and normal pressure, and the cadmium sulfide prepared in the milky white aqueous solution quantum dots;

[0031] The fourth step is to filter the milky white solution obtained in the third step with filter paper to obtain a powdery substance, rinse t...

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Abstract

The invention relates to a preparation method of CdS quantum dot with adjustable size, belonging to the technical field of the preparation of CdS quantum dot. The A solution is formed by mixing the cadmium chloride, the ammonium chloride and water in set matching and the B solution is formed by mixing the mercaptoethanol, the thiourea and water in set matching. The A solution and the B solution are mixed at the temperature a little higher than the ambient temperature and then carried on the synthetic reaction, and then the CdS quantum dot can be obtained. The preparation method of CdS quantum dot with adjustable size has the advantages that the size of the quantum dot of the product can be adjusted by controlling the quantity of the mercaptoethanol.

Description

technical field [0001] The invention relates to a preparation method of cadmium sulfide quantum dots with adjustable size, and belongs to the technical field of preparation of cadmium sulfide quantum dots. Background technique [0002] With the development of nanotechnology, semiconductor nanocrystals have become a research hotspot due to their unique physical and chemical properties. In recent years, semiconductor quantum dots, as a new type of fluorescent material, have been widely used in bioluminescent probes, biochips, lasers, optoelectronic devices and other fields, especially in the life science research to qualitatively and quantitatively mark biomolecules and cells. It can be seen that it has broad application prospects. [0003] In the research of II-VI semiconductor quantum dots, cadmium sulfide quantum dots have been paid close attention to by people. Compared with other materials, cadmium sulfide quantum dots have excellent spectral properties, the excitation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/56
Inventor 茅惠兵侯士丽朱自强王基庆
Owner EAST CHINA NORMAL UNIV