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Method for preparing near-infrared cadmium telluride quantum dots through hydrothermal treatment

A cadmium telluride quantum dot, near-infrared technology, applied in chemical instruments and methods, nanotechnology, nano-optics, etc., can solve the problems of water-soluble quantum dots, such as the limitation of the luminous range, and achieve low raw material prices, simple equipment, and easy The effect of the operation

Active Publication Date: 2020-01-14
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a hydrothermal preparation method of near-infrared luminescent cadmium telluride quantum dots to solve the limitation of the traditional preparation of water-soluble quantum dots.

Method used

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  • Method for preparing near-infrared cadmium telluride quantum dots through hydrothermal treatment
  • Method for preparing near-infrared cadmium telluride quantum dots through hydrothermal treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0032] a. Add 0.5mL of 0.1M cadmium chloride aqueous solution and 10uL of mercaptopropionic acid solution into 4.5mL of water, and stir evenly.

[0033] b. Adjust the pH value of the mixed solution to 9.1 with a 1.0M aqueous sodium hydroxide solution, and then pass nitrogen gas for 30 minutes. After injecting 15uL of the 0.667M sodium hydride telluride solution just prepared, the precursor solution of cadmium telluride can be obtained. In this embodiment, the molar ratio of cadmium chloride: mercaptopropionic acid: sodium hydride telluride is 1:2.4:0.2, and the concentration of cadmium ions is 10 mM.

[0034] c. After heating the precursor solution for five minutes, add 3 mL of isopropanol to mix, remove the supernatant after centrifugation, and disperse the precipitated quantum dots in 200 mL of deionized water.

[0035] d. Add 0.5mL cadmium chloride solution and 10uL mercaptopropionic acid solution, and then adjust the pH value of the mixed solution to 9.1 with 1.0M aqueous...

Embodiment 2

[0037] a. Add 5mL of 0.1M cadmium chloride aqueous solution and 0.1mL of mercaptopropionic acid solution into 45mL of water, and stir evenly.

[0038] b. Adjust the pH value of the mixed solution to 9.1 with a 1.0M aqueous sodium hydroxide solution, and then pass nitrogen gas for 30 minutes. After injecting 0.15mL of the 0.667M sodium hydride telluride solution just prepared, the precursor solution of cadmium telluride can be obtained. In this embodiment, the molar ratio of cadmium chloride: mercaptopropionic acid: sodium hydride telluride is 1:2.4:0.2, and the concentration of cadmium ions is 10 mM.

[0039] c. After heating the precursor solution for five minutes, add 30 mL of isopropanol to mix, remove the supernatant after centrifugation, and disperse the precipitated quantum dots in 200 mL of deionized water.

[0040] d. Add 6.8mL cadmium chloride solution and 140uL mercaptopropionic acid solution, and then adjust the pH value of the mixed solution to 9.1 with 1.0M aqueo...

Embodiment 3

[0042] a. Add 10mL of 0.1M cadmium chloride aqueous solution and 140uL of thioglycolic acid solution into 50mL of water, and stir evenly.

[0043] b. Adjust the pH value of the mixed solution to 11 with a 1.0M aqueous sodium hydroxide solution, and then pass nitrogen gas for 30 minutes. After injecting 150uL of the 0.667M sodium hydride telluride solution just prepared, the precursor solution of cadmium telluride can be obtained. In this embodiment, the molar ratio of cadmium chloride: mercaptoacetic acid: sodium hydride telluride is 1:2:0.1, and the concentration of cadmium ions is 16.7mM.

[0044] c. After heating the precursor solution for five minutes, add 40 mL of isopropanol to mix, remove the supernatant after centrifugation, and disperse the precipitated quantum dots in 200 mL of deionized water.

[0045] d. Add 5mL of cadmium chloride solution and 70uL of mercaptopropionic acid solution, and then adjust the pH value of the mixed solution to 11 with 1.0M aqueous sodium ...

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Abstract

The invention discloses a method for preparing near-infrared cadmium telluride quantum dots through hydrothermal treatment. The method comprises the following steps: respectively adding a cadmium saltsolution and a sulfydryl ligand into an aqueous solution, and performing uniform mixing so as to obtain a mixed solution, wherein the mole ratio of the sulfydryl ligand to the cadmium salt is (2-4):1; adjusting the pH value of the mixed solution to 9-11, introducing nitrogen for 30 minutes or longer, adding a sodium hydrogen telluride aqueous solution, and performing uniform mixing so as to obtain a cadmium telluride precursor solution, wherein the mole ratio of the cadmium telluride to cadmium ions is (0.1-0.2):1; heating the cadmium telluride precursor solution for 5 minutes, adding a precipitant, performing centrifugation, removing supernate, adding water, and performing secondary dissolution; adding the cadmium salt solution and the sulfydryl ligand into the dissolved cadmium telluride quantum dots, wherein the mole ratio of thiohydracrylic acid to cadmium chloride is (2-4):1; and adjusting the pH value of the mixed solution to 9-11, and performing heating for a certain time, so as to obtain the cadmium telluride quantum dots with near-infrared light emission. By adopting the method disclosed by the invention, near-infrared cadmium telluride quantum dots can be prepared, and the obtained cadmium telluride quantum dots have good lattice structures.

Description

technical field [0001] The invention relates to the field of preparation of water-soluble quantum dots, in particular to a method for hydrothermally preparing near-infrared cadmium telluride quantum dots. Background technique [0002] Cadmium telluride quantum dots belong to nanocrystals composed of II-VI group elements, and are spherical crystals with a diameter of less than 10 nanometers. As a luminescent material, cadmium telluride quantum dots have good optical stability, wide excitation spectrum, narrow emission spectrum, and luminescence wavelength in the visible light region (400-700nm), and can be widely used in various fields. However, in the fields of fluorescent labeling of biological cells and live animal imaging, biological compounds and tissues specifically absorb and scatter incident light to varying degrees. Only the near-infrared light (700-900nm) band has higher spatial resolution, deeper penetration depth of biological matrix, and lower optical absorption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88B82Y20/00B82Y40/00
CPCC09K11/883B82Y20/00B82Y40/00
Inventor 江源王祎杨嘉灏
Owner HANGZHOU DIANZI UNIV
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