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Synthesis and application of copper-indium-sulfur ternary quantum dots taking mercapto polyvinyl alcohol as ligand

A technology of mercaptopolyvinyl alcohol and ternary quantum dots, which is applied in the field of biochemistry, can solve the problems of heavy metal toxicity and limit applications, and achieve the effects of short synthesis time, cheap raw materials, and reduced toxicity

Inactive Publication Date: 2019-11-22
LANZHOU UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, quantum dots containing Cd have been widely reported, but the inherent toxicity of heavy metals severely limits its application.

Method used

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  • Synthesis and application of copper-indium-sulfur ternary quantum dots taking mercapto polyvinyl alcohol as ligand
  • Synthesis and application of copper-indium-sulfur ternary quantum dots taking mercapto polyvinyl alcohol as ligand
  • Synthesis and application of copper-indium-sulfur ternary quantum dots taking mercapto polyvinyl alcohol as ligand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 2.00g of PVA into a 100ml beaker, add 50.00mL of distilled water, and stir at 70°C to dissolve the PVA completely to obtain an aqueous solution of polyvinyl alcohol; add 10.00mL of acetic acid with a mass fraction of 36% to a 250mL round bottom flask solution, 18.00mL acetic anhydride, 0.20mL concentrated sulfuric acid and 20.00mL mercaptoacetic acid, and stir well; then add polyvinyl alcohol aqueous solution to the round bottom flask, and react at a constant temperature of 30°C for 24 hours to obtain the post-reaction liquid; take the volume as the reaction Add absolute ethanol three times the volume of the final solution, slowly drop the reaction solution into absolute ethanol, and keep stirring, a large amount of white flocculent precipitates are formed; after suction filtration, let it stand and air dry; then wrap the solid product into a small bag with filter paper and washed with methanol for 24 h in a Soxhlet extractor. After washing, the product was left t...

Embodiment 2

[0038] According to the ratio of adding 2.00g polyvinyl alcohol (PVA) and 0.2mL concentrated sulfuric acid to 50mL distilled water, take distilled water, polyvinyl alcohol and concentrated sulfuric acid respectively, add polyvinyl alcohol to distilled water, and stir at 80°C to make PVA completely Dissolve to obtain polyvinyl alcohol aqueous solution; get the acetic acid solution whose volume is 60 times the volume of the vitriol oil with a mass fraction of 36%, get the acetic anhydride whose volume is 100 times the volume of the vitriol oil, and get the mercaptoacetic acid whose volume is 110 times the volume of the vitriol oil. Mix concentrated sulfuric acid, acetic acid solution, acetic anhydride, and mercaptoacetic acid, stir well, add polyvinyl alcohol aqueous solution, and react at a constant temperature at 40°C for 26 hours to obtain a post-reaction solution; take the post-reaction solution and no Water and ethanol, slowly drip the reacted liquid into absolute ethanol, s...

Embodiment 3

[0040] According to the ratio of adding 2.00g polyvinyl alcohol (PVA) and 0.2mL concentrated sulfuric acid to 50mL distilled water, take distilled water, polyvinyl alcohol and concentrated sulfuric acid respectively, add polyvinyl alcohol to distilled water, and stir at a temperature of 75°C to make the PVA completely Dissolving, get polyvinyl alcohol aqueous solution; Get volume and be that the mass fraction of 55 times of the vitriol oil volume is the acetic acid solution of 36%, get the acetic anhydride that the volume is 95 times of the vitriol oil volume, get the mercaptoacetic acid that the volume is 105 times of the vitriol oil volume, Mix concentrated sulfuric acid, acetic acid solution, acetic anhydride and mercaptoacetic acid, stir well, add polyvinyl alcohol aqueous solution, and react at a constant temperature of 35°C for 25 hours to obtain the post-reaction solution; according to the volume ratio 1:5, take the post-reaction solution and no Water and ethanol, slowly...

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Abstract

The invention discloses synthesis and application of copper-indium-sulfur ternary quantum dots taking mercapto polyvinyl alcohol as a ligand. The quantum dots are prepared by dissolving polyvinyl alcohol in distilled water to obtain a polyvinyl alcohol aqueous solution; mixing concentrated sulfuric acid, an acetic acid solution, acetic anhydride and mercaptoacetic acid, and carrying out a constant-temperature reaction to obtain a reacted solution; dropwise adding absolute ethyl alcohol into the reacted solution, and stirring the mixture to generate a flocculent precipitate; standing and air-drying a product after suction filtration; wrapping the product with filter paper, washing the product with methanol, standing and air-drying the product to obtain the mercapto polyvinyl alcohol; dissolving the mercapto polyvinyl alcohol in distilled water, adding CuCl<2>.2H2O and InCl<3>.4H2O to obtain a mixed solution, adjusting the pH value of the solution under nitrogen protection, quickly adding thiourea, stirring and reacting the mixture, and cooling the reaction solution to room temperature to obtain a clear solution; adding absolute ethyl alcohol into the clear solution to generate a precipitate, performing high-speed centrifugation, and removing a supernate to obtain the quantum dots. The quantum dots are applied to cell imaging and tracing. The synthesis method is short in synthesis time, and environment-friendly, and can be directly applied to a biological system.

Description

technical field [0001] The invention belongs to the technical field of biochemistry, and relates to a synthesis method of copper indium sulfur ternary quantum dots with mercaptopolyvinyl alcohol as a ligand; the invention also relates to an application of the ternary quantum dots synthesized by the synthesis method. Background technique [0002] Quantum dots (Quantum dots, QDs), also known as semiconductor nanocrystals, are approximately spherical in shape, with a three-dimensional size in the range of 2-10nm, and have obvious quantum effects. Quantum dots are generally composed of semiconductor materials such as II-VI group elements (such as CdS, CdSe, CdTe, ZnSe, etc.) or III-V group elements (cadmium-free quantum dots, such as InP, InAs, etc.), or two or two The above semiconductor materials form a core / shell structure (such as common CdSe / ZnS core / shell structure quantum dots, etc.). Quantum dots (QDs) are the state of matter between the macroscopic bulk phase and the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/62C09K11/02G01N33/48
CPCC09K11/621C09K11/025G01N33/48
Inventor 来守军李志飞杨学琴王林刘美娜陈晟关晓琳
Owner LANZHOU UNIV OF ARTS & SCI
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