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Preparation method for water-soluble quantum dot with adjustable ingredients used in biomass

A quantum dot, water-soluble technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of limited quantum dot application, low quantum yield, large forbidden band width, etc., and achieve the effect of inhibiting the leakage of heavy metal ions

Inactive Publication Date: 2011-05-11
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single-component quantum dots prepared in the water phase have poor luminescence performance and low quantum yield, and the quantum yield is relatively high and the most widely used II-VI quantum dots themselves contain heavy metals, and there is a possibility of heavy metal leakage. , is potentially harmful to organisms, so its application in biology and medicine is also limited.
The safer II-VI semiconductor materials are limited to ZnO, ZnS, ZnSe, and ZnTe, but their large band gaps can only absorb high-energy ultraviolet light, which limits the application of such quantum dots in vivo

Method used

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  • Preparation method for water-soluble quantum dot with adjustable ingredients used in biomass
  • Preparation method for water-soluble quantum dot with adjustable ingredients used in biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The first step is to prepare Se source and Te source precursors.

[0022] Weigh 0.1389g NaBH 4 Dissolve in 5ml of deionized water, pass through argon to exhaust oxygen for 30min~1h. Weigh elemental 0.0278gSe, 0.0449g Te powder, mix and add to NaBH that has been deoxygenated 4 In the solution, the water seals the ultrasonic reaction until the color of the reaction solution becomes very light pink or colorless, forming NaHSe and NaHTe precursors.

[0023] The second step is to prepare the cadmium precursor.

[0024] Weigh 0.6263g Cd(Ac) 2 2H 2 O was dissolved in 120ml of deionized water, and 0.4ml of stabilizer thioglycolic acid (TGA) was added to produce a white precipitate. After stirring, the pH value was adjusted to 11.2 with 1mol / L NaOH, and finally a colorless and clear solution was obtained.

[0025] In the third step, under the protection of argon, the Se and Te source precursors were mixed and quickly injected into the cadmium precursor solution, and heated ...

Embodiment 2

[0032] The first step is to prepare Se source and Te source precursors.

[0033] Weigh 0.1389g NaBH 4 Dissolve in 5ml of deionized water, pass through argon to exhaust oxygen for 30min~1h. Weigh elemental 0.0185gSe, 0.0599g Te powder, mix and add to NaBH that has been deoxygenated 4 In the solution, the water seals the ultrasonic reaction until the color of the reaction solution becomes very light pink or colorless, forming NaHSe and NaHTe precursors.

[0034] The second step is to prepare the cadmium precursor.

[0035] Weigh 0.6263g Cd(Ac) 2 2H 2 O was dissolved in 120ml of deionized water, and 0.4ml of stabilizer thioglycolic acid (TGA) was added to produce a white precipitate. After stirring, the pH value was adjusted to 11.2 with 1mol / L NaOH, and finally a colorless and clear solution was obtained.

[0036] In the third step, under the protection of argon, the Se and Te source precursors were mixed and quickly injected into the cadmium precursor solution, and heated ...

Embodiment 3

[0043] The first step is to prepare Se source and Te source precursors.

[0044] Weigh 0.1389g NaBH 4 Dissolve in 5ml of deionized water, pass through argon to exhaust oxygen for 30min~1h. Weigh elemental 0.0371gSe, 0.0299g Te powder, mix and add to NaBH that has been deoxygenated 4 In the solution, the water seals the ultrasonic reaction until the color of the reaction solution becomes very light pink or colorless, forming NaHSe and NaHTe precursors.

[0045] The second step is to prepare the cadmium precursor.

[0046] Weigh 0.6263g Cd(Ac) 2 2H 2 O was dissolved in 120ml of deionized water, and 0.4ml of stabilizer TGA was added to produce a white precipitate. After stirring, the pH value was adjusted to 11.2 with 1mol / L NaOH, and finally a colorless and clear solution was obtained.

[0047] In the third step, under the protection of argon, the Se and Te source precursors were mixed and quickly injected into the cadmium precursor solution, and heated and refluxed at 100 ...

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Abstract

The invention discloses a preparation method for water-soluble quantum dot with adjustable ingredients used in biomass. The preparation method has the characteristics that a ZnS layer is coated on the surface of the water-soluble alloy quantum dot to obtain the water-soluble quantum dot with adjustable ingredients in the biomass. In the water-soluble quantum dot prepared by adopting the method provided by the invention, absorption and emission wavelengths are adjusted through alloy proportion and particle size of inner layer alloy quantum dots, so as to achieve the purpose of emitting specific wavelength; and the ZnS layer coated on the outer layer can restrain heavy metal ion leakage of the inner layer alloy quantum dots, and the quantum dots are nearly nontoxic and can be effectively applies to biomass.

Description

technical field [0001] The invention relates to the technical field of synthesizing luminescent nanomaterials with specific structures, in particular to a method for preparing water-soluble quantum dots with adjustable components used in living organisms. Background technique [0002] The particle size of quantum dots is generally between 1 and 10 nm. Compared with bulk materials, the continuous energy band structure becomes a discrete energy level structure with molecular characteristics, and can emit fluorescence after being excited. Quantum dots synthesized by traditional organic synthesis methods have a high quantum yield, but the synthetic raw materials are expensive, the reaction temperature is high, the reaction is dangerous, the surface organic stabilizer is highly toxic, and the water solubility is poor. Although it can be dissolved in the water phase through the replacement of surface groups, this process is limited and time-consuming, and the quantum yield of quan...

Claims

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Application Information

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IPC IPC(8): C09K11/88
Inventor 丁旵明周丽英欧阳涛
Owner EAST CHINA NORMAL UNIV