Preparation method of aqueous phase non-toxic white light quantum with multilayer core-shell structure

A multi-layer core-shell structure and white light technology, which is applied in chemical instruments and methods, luminescent materials, and the use of gas discharge lamps, etc., can solve problems such as difficult spectrum adjustment and multi-layer quantum dot synthesis, and achieve good application prospects , low raw material price, good water solubility and stability

Inactive Publication Date: 2012-08-01
SOUTHEAST UNIV
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Problems solved by technology

The aqueous phase synthesis of single multilayer white light quantum dots has not been reported, and the synthesis of multil

Method used

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Embodiment Construction

[0016] The raw materials zinc nitrate, copper chloride, manganese chloride, thioacetamide, mercaptopropionic acid, sodium hydroxide, selenium 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.

[0017] (1) Preparation of NaHSe: Dissolve 0.17g of sodium borohydride in 3ml of deionized water, and quickly add 0.16g of selenium 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 4 hours, the black selenium powder disappeared and white sodium borate crystals were produced. The clear solution in the upper layer was NaHSe with a concentration of 0.667mol / L. Its reaction equation:

[0018] 4NaBH 4 + 2Se + 7H 2...

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Abstract

The invention relates to a preparation method of an aqueous phase non-toxic white light quantum with a multilayer core-shell structure. The preparation method comprises the following specific steps: (a) preparing a shell layer material Zn+mercaptopropionic acid (MPA)+thioacetamide (TAA): taking Zn(NO3)2 and adding the Zn(NO3)2 into a conical flask filled with deionized water, taking the MPA by using a miniature liquid-transferring gun; adding the TAA into the solution; fully stirring the solution and then adjusting the pH value of the mixed solution by using NaOH; and fully stirring the solution for later use; (b) adding the deionixed water, manganese chloride and the MPA in a three-necked bottle, adjusting the pH value and then introducing nitrogen gas and removing air in the three-necked bottle by using high-purity nitrogen gas; injecting sodium hydrogen selenide by using an injector and then allowing the manganese chloride and the sodium hydrogen selenide to be fully acted to form a selenide-rich MnSe quantum dot; then injecting zinc nitrate and growing for one hour; injecting the shell layer material in the step (a) and growing; then adding a copper chloride solution and growing; adding the shell layer material; and finally, regrowing to obtain the required white light quantum dot. The white light quantum dot synchronized by the preparation method is better in water solubility and stability and has broad application prospect.

Description

technical field [0001] The invention relates to a preparation method for self-assembly to prepare water-phase non-toxic multilayer structure white light quantum dots and the encapsulation treatment of the quantum dots. Background technique [0002] Quantum dots are semiconductor nanoparticles with a radius smaller than or close to the exciton Bohr radius. Because of their 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, and can be used as fluorescent markers, and have broad application prospects in biomolecular recognition and detection, and light-emitting diodes. [0003] In practical applications, not only pure, stable, monodisperse and high-quality quantum dots are required, but also water-soluble and non-toxic. The mercapto aqueous phase method uses ionic precursors, and the cation is Zn 2+ 、Cd 2+ or Hg 2+ , the an...

Claims

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Application Information

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IPC IPC(8): C09K11/88
CPCY02B20/181Y02B20/00
Inventor 徐淑宏王春雷崔一平
Owner SOUTHEAST UNIV
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