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Non-toxic quantum dot with controllable particle size and preparation method thereof

A technology of quantum dots and particle size, applied in the field of non-toxic quantum dots and their preparation, can solve the problems of unsuitable preparation method popularization and high operation requirements

Inactive Publication Date: 2021-04-09
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in order to obtain QDs of different colors, the synthesis time and temperature must be strictly controlled, which requires very high requirements for the operation of the experiment and is not suitable for the popularization of the preparation method. Therefore, it is necessary to improve the existing preparation method

Method used

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  • Non-toxic quantum dot with controllable particle size and preparation method thereof
  • Non-toxic quantum dot with controllable particle size and preparation method thereof
  • Non-toxic quantum dot with controllable particle size and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Synthesis of indium phosphide / zinc sulfide of non-toxic blue-green quantum dots

[0041] Add 50mg of indium chloride and 1g of zinc bromide into the three-hole flask, then take out 5mL of oleylamine from the vacuum glove box, inject it quickly, close the three-hole flask after completion, start vacuuming for 30min, and set the temperature to 120°C; Turn off the vacuum, start feeding nitrogen, raise the temperature to 200°C, add 0.2mL of tris(diethylamino)phosphorus and the solution will gradually turn yellow, continue heating for 10min, during the heating process, take a small amount of samples for detection at any time, that is the The core structure of the desired blue-green quantum dots. Then 1.7 mL of trioctyl sulfide was added dropwise, and the reaction system gradually turned orange red and then continued to heat up to 320°C; then sampled and tested at any time, and the heating was stopped after 20 minutes, at which point the desired shell structure of ...

Embodiment 2

[0042] Embodiment 2, the synthesis of the indium phosphide / zinc sulfide of nontoxic green quantum dot

[0043] Add 80mg of indium bromide and 1g of zinc bromide into the three-hole flask, then take out 5mL of oleylamine from the vacuum glove box, inject it quickly, close the three-hole flask after completion, start vacuuming for 30min, and set the temperature to 120°C; Turn off the vacuum, start feeding nitrogen gas, raise the temperature to 200°C, add 0.28mL of tris(diethylamino)phosphorus and the solution will gradually turn yellow, continue heating for 10min, during the heating process, take a small amount of samples for detection at any time, that is the The core structure of the desired green quantum dots. Then 1.8 mL of trioctyl sulfide was added dropwise, the reaction system gradually turned orange red and then continued to heat up to 320°C; then samples were taken for inspection at any time, and heating was stopped after 20 minutes, at which point the desired shell str...

Embodiment 3

[0044] Embodiment 3, the synthesis of the indium phosphide / zinc sulfide of nontoxic orange quantum dot

[0045] Add 50 mg of indium chloride and 770 mg of zinc chloride into the three-hole flask, then take out 5 mL of oleylamine from the vacuum glove box, inject it quickly, close the three-hole flask after completion, start vacuuming for 30 minutes, and set the temperature to 120°C; Turn off the vacuum, start feeding nitrogen, heat up to 240°C, add 0.1mL of tris(diethylamino)phosphorus, heat up to 270°C for 3 minutes, then slowly add 0.15mL of tris(diethylamino)phosphorus, the solution gradually turns yellow, and maintains for 10min , that is, to obtain the desired core structure of orange indium phosphide quantum dots. Then the temperature was raised to 320°C, and (during the temperature rise) 2 mL of trioctylsulfur was added, which must be added slowly. Take a small amount of samples for detection at any time, and continue heating for 10 minutes to obtain the required zinc su...

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Abstract

The invention discloses a non-toxic quantum dot with a controllable particle size and a preparation method thereof. The preparation method of the non-toxic quantum dot comprises the following steps: preparing a core structure and a shell structure; wherein the core structure is indium phosphide, the donor of indium is indium halide, and the donor of phosphorus is tri(diethylamino)phosphorus; the shell structure is zinc sulfide, the donor of zinc is zinc halide, and the donor of sulfur is trioctylsulfur. Tris(diethylamino)phosphorus is adopted, so that generation of toxic gas is avoided, and the production cost is reduced. And secondly, the method can effectively control the wavelength and the particle size of the quantum dots, controls the particle size of the QDs by adopting the composition and the proportion of different halogen elements, changes the instability and the determinacy of controlling the particle size of the QDs by controlling the synthesis time in the conventional QDs synthesis method, and improves the controllability of the method.

Description

technical field [0001] The invention relates to a non-toxic quantum dot with controllable particle size and a preparation method thereof, belonging to the technical field of fine chemicals. Background technique [0002] After more than 30 years of development, quantum dot materials (Quantum Dots, QDs) have played an important role in basic research and industrial production. Bioluminescent probes and other fields have a wide range of applications. At present, the morphology, size, composition, and surface ligands of QDs can be strictly controlled, and they are playing an increasingly important role in fluorescent materials-based rapid immunoassay methods for small molecules. However, there are still many limitations in practical applications of QDs. Traditional high-performance QDs materials (group II-VI or IV-VI) usually contain highly toxic elements such as cadmium or lead. The preparation and use of such materials in large quantities will not only cause great harm to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/70B82Y20/00B82Y30/00B82Y40/00
CPCC09K11/02C09K11/70B82Y20/00B82Y30/00B82Y40/00
Inventor 王战辉沈建忠温凯江海洋于雪芝余文博张素霞史为民张会艳
Owner CHINA AGRI UNIV
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