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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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  • Summary
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  • Description
  • Claims
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AI 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 solving the problem of large particle size and stability of the water-soluble quantum dot prepared by ligand exchange in the prior art. The problem of low and low fluorescence intensity

Method used

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Examples

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Effect test

Embodiment 1

[0035] 1. Take 10 mg of oil-soluble CdZnS / ZnS quantum dots and dissolve them in 10 mL of chloroform to make a 1 mg / mL oil-soluble quantum dot solution;

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

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

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

Embodiment 2

[0040] 1. Take 5mg of oil-soluble InP / ZnS quantum dots and dissolve them in 5mL of chloroform to make 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, a 75 mg / mL ligand solution is prepared;

[0042] 3. Add butyl ethanolamine to the ligand solution to adjust the pH value to 9;

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

Embodiment 3

[0045] 1. Take 20mg of oil-soluble PbSeTe quantum dots and dissolve them in 20mL of chloroform to make a 1mg / mL oil-soluble quantum dot solution;

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

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

[0048] 4. Mix the oil-soluble quantum dot solution with the ligand solution with a pH value of 9, stir vigorously 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 modified unsaturated carboxylic acid polymers to carry out ligand exchange on oil-soluble quantum dots to obtain water-soluble quantum dots with modified unsaturated carboxylic acid polymer ligands on the surface. The unsaturated carboxylic acid polymer is the unsaturated carboxylic acid polymer modified by...

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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.

Description

technical field [0001] The invention relates to the technical field of quantum dots, in particular to a water-soluble quantum dot and a preparation method thereof. Background technique [0002] Quantum dots have become more and more important in the field of biomedical labeling and imaging due to their excellent properties such as narrow fluorescence emission peaks, continuous absorption spectra, and stable and high-brightness fluorescence emission with wavelengths tunable with particle size. . At present, there are two main methods for quantum dot synthesis: oil-phase method and water-phase method. The surface is covered with a large number of organic solvent molecules (such as carboxylic acids with long alkyl chains, amines, and phosphorus oxides) and is hydrophobic. However, quantum dots used in the field of biology usually require good water solubility and biocompatibility, so it is an important way to prepare high-performance water-soluble quantum dots by phase transf...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/56C09K11/70C09K11/88
CPCC09K11/025C09K11/565C09K11/703C09K11/881
Inventor 杨青松
Owner TCL CORPORATION
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