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Method for preparing water phase non-toxic quantum dot zinc telluride

A technology of quantum dots and zinc telluride is applied in the field of preparation of water-phase zinc telluride non-toxic quantum dots prepared by self-assembly, and achieves the effects of short time, simple equipment and easy operation.

Inactive Publication Date: 2010-05-19
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

For the synthesis of zinc telluride quantum dots, physical methods and organometallic methods have been reported, but thiol aqueous ZnTe quantum dots have not been reported.

Method used

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Embodiment Construction

[0018] The raw materials zinc nitrate, mercaptoacetic acid, sodium hydroxide, tellurium powder and sodium borohydride used in the present invention are all analytical reagents. The solvent is high-purity deionized water. All instruments used in the experiment were rinsed three times with deionized water.

[0019] (1) Preparation of NaHTe: Dissolve 0.39g of sodium borohydride in 6ml of deionized water, and quickly add 0.51g of tellurium powder. The reaction vessel is sealed with a rubber stopper, which has a small pinhole to communicate with the outside world so as to release the hydrogen generated by the reaction. During the reaction, the system was cooled with an ice-water bath. After about 8 hours, the black tellurium powder disappeared and white sodium borate crystals were produced. The clear NaHTe solution in the upper layer was lavender with a concentration of 0.667mol / L. Its reaction equation:

[0020] 4NaBH 4 +2Te+7H 2 O→2NaHTe+Na 2 B 4 o 7 +14H 2 ↑

[0021] (...

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Abstract

The invention provides a method for preparing water-phase non-toxic quantum dot zinc telluride. The preparation method comprises the following steps: a, NaHTe preparation: sodium borohydride is dissolved in deionized water, tellurium powder is quickly added into the solution, and a reactor is sealed by a rubber plug which is provided with a pin hole to be communicated with the outside for releasing hydrogen generated in reaction; in the reacting process, the system is cooled by ice-water bath, after several hours, the black tellurium powder disappears, white sodium borate is generated, and upper clear NaHTe solution is light purple; b, preparation of Zn+TGA thioglycolic acid precursor: Zn(NO3)2 is added to a conical flask, a certain amount of TGA is added to the solution by a miniature pipetting gun, pH of the mixed solution of the Zn(NO3)2 and the TGA is adjusted by NaOH after sufficient stirring, the solution is kept for later use after sufficient stirring; and c, preparation of water phase ZnTe quantum dot: the mixed solution prepared in the step b is deoxidized by N2 gas, and the NaHTe in the step 1 is quantitatively taken by a particle injection needle, and is injected into the mixed solution, and the solution is continuously stirred to obtain ZnTe nanometer crystal.

Description

technical field [0001] The invention relates to a method for self-assembling to prepare non-toxic quantum dots of zinc telluride in water phase, and a method for preparing sodium hydride telluride. Background technique [0002] Quantum dots are semiconductor nanocrystalline particles with a radius smaller than or close to the exciton Bohr radius. Because of their unique quantum size effect and surface effect, they have good applications in luminescent materials and photosensitive sensors. Group II-VI quantum dots have fluorescence properties in the visible light region, can be used as fluorescent markers, and have broad application prospects in biomolecular recognition and detection. [0003] In practical applications, not only pure, stable, monodisperse high-quality nanocrystals are required, but also quantum dots are required to be water-soluble and non-toxic. Such cadmium-containing quantum dots cannot meet the requirements. As a congener element of cadmium, zinc has at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04C01B19/00C09K11/88
Inventor 徐淑宏崔一平
Owner SOUTHEAST UNIV
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