Water-soluble quantum dot and preparation method thereof

A quantum dot, water-soluble technology, applied in the field of quantum dots, can solve the problems of low stability, low fluorescence intensity, large particle size, etc., achieve strong coordination ability, improve stability, strong light intensity, strong water solubility and biofunctional effects

Inactive Publication Date: 2019-02-05

TCL CORPORATION

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AI-Extracted Technical Summary

Problems solved by technology

[0005] In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a water-soluble quantum dot and its preparation method, aiming at solvi...

Method used

In order to solve the above problems, the invention provides a kind of preparation method of water-soluble quantum dot, specifically by the unsaturated carboxylic acid polymer solution that the last position mercapto group replaces the organic primary amine modification and joins in the oil-soluble quantum dot solution The ligand exchange reaction is carried out, and the water-soluble quantum dots with modified unsaturated carboxylic acid polymer ligands on the surface are obtained by centrifugal separation. The unsatura...

Abstract

The invention discloses a water-soluble quantum dot and a preparation method thereof. The method comprises the following steps: adding modified unsaturated carboxylic acid polymer into an oil-solublequantum dot solution to perform ligand exchange, and centrifuging to obtain the water-soluble quantum dot containing modified unsaturated carboxylic polymer ligand on surface, wherein the modified unsaturated carboxylic polymer is unsaturated carboxylic polymer modified by end-site-sulfydryl-substituted organic primary amine which is a polydentate ligand, and sulfydryls therein can provide stronger coordination ability for the surface of the quantum dot, so that stability and high light intensity of the quantum dot can be greatly improved; and carboxyl on the surface of the unsaturated carboxylic polymer can provide stronger water solubility and biofunctionability for the quantum dot.

Application Domain

Luminescent compositions

Technology Topic

Water solubleSolubility +5

Examples

Experimental program(3)

Example Embodiment

[0034] Example 1

[0035] 1. Dissolve 10 mg of oil-soluble CdZnS/ZnS quantum dots in 10 mL of chloroform, and prepare a 1 mg/mL oil-soluble quantum dot solution;

[0036] 2. Dissolve 400 mg of mercaptoethylamine-modified polyacrylic acid in 10 mL of n-hexane, and after ultrasonic dispersion, prepare a 40 mg/mL ligand solution;

[0037] 3. Add sodium hydroxide to the ligand solution to adjust the pH to 10;

[0038] 4. Mix the oil-soluble quantum dot solution and the ligand solution with a pH of 10, stir vigorously for 30 minutes, add deionized water and centrifuge to obtain the water-soluble quantum dots of the present invention.

Example Embodiment

[0039] Example 2

[0040] 1. Dissolve 5mg of oil-soluble InP/ZnS quantum dots in 5mL of chloroform, and prepare a 1mg/mL oil-soluble quantum dot solution;

[0041] 2. Dissolve 375 mg of mercaptoethylamine-modified polyacrylic acid in 5 mL of methanol, and after ultrasonic dispersion, prepare a 75 mg/mL ligand solution;

[0042] 3. Add butylethanolamine to the ligand solution and adjust the pH to 9;

[0043] 4. Mix the oil-soluble quantum dot solution and the ligand solution with a pH of 9, vigorously stir for 45 minutes, add deionized water and centrifuge to obtain the water-soluble quantum dots of the present invention.

Example Embodiment

[0044] Example 3

[0045] 1. Dissolve 20 mg of oil-soluble PbSeTe quantum dots in 20 mL of chloroform, and prepare a 1 mg/mL oil-soluble quantum dot solution;

[0046] 2. Take 1800 mg of mercaptoethylamine modified polyacrylic acid and dissolve it in 20 mL of methanol, and after ultrasonic dispersion, prepare a 90 mg/mL ligand solution;

[0047] 3. Add potassium hydroxide to the ligand solution to adjust the pH to 11;

[0048] 4. Mix the oil-soluble quantum dot solution and the ligand solution with a pH of 9, vigorously stir for 60 minutes, add deionized water and centrifuge to obtain the water-soluble quantum dots of the present invention.

[0049] In summary, the present invention uses a modified unsaturated carboxylic acid polymer to perform ligand exchange for oil-soluble quantum dots to prepare water-soluble quantum dots containing modified unsaturated carboxylic acid polymer ligands on the surface. The unsaturated carboxylic acid polymer is an unsaturated carboxylic acid polymer modified with a primary amine substituted with a mercapto group at the terminal position. The unsaturated carboxylic acid polymer modified by the last sulfhydryl group substituted organic primary amine is a multidentate ligand, and the multiple sulfhydryl groups contained in it can provide a stronger coordination ability for the surface of the quantum dot, thereby greatly improving the quantum dot Stability and strong light intensity; at the same time, the carboxyl group on the surface of the unsaturated carboxylic acid polymer can provide the quantum dots with stronger water solubility and biological functionality.

PUM

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