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Preparation method for nanocrystals

A technology of nanocrystals and precursor substances, applied in chemical instruments and methods, inorganic chemistry, phosphide, etc., can solve the problems of difficult control, high cost, low preparation cost, etc., and achieve easy mass production and narrow half-peak width. , the effect of simple steps

Active Publication Date: 2019-08-20
SUZHOU XINGSHUO NANOTECH CO LTD
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Problems solved by technology

[0005] In the prior art, the preparation of quantum dots often has the following problems, the performance of the method with lower preparation cost is poor, and the preparation cost of the preparation method with higher product performance is too high
For example, the preparation of indium phosphide quantum dots generally includes three methods: 1) Under high temperature, organic alkylphosphine is used as phosphorus to obtain indium phosphide quantum dots from the reaction of fatty acid indium precursors. The preparation process of this method is cumbersome and the raw materials are expensive. The cost is high; 2) At high temperature, phosphine gas directly reacts with fatty acid indium to obtain indium phosphide quantum dots. This method requires the introduction of toxic gas, the operation is complicated, dangerous and difficult to control, and the product performance is poor and the cost is high; 3) Elemental phosphorus is used as a phosphorus source to react with indium fatty acid to obtain indium phosphide quantum dots. Although this method is simple to operate, it has high potential safety hazards.
[0006] In addition, the above-mentioned problems in the preparation of quantum dots also lead to the difficulty of large-scale production of quantum dots

Method used

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  • Preparation method for nanocrystals

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preparation example Construction

[0026] The invention discloses a method for preparing nanocrystals, which comprises the following steps: quickly adding nanocrystals with relatively uneven particle diameters into an organic solvent with a predetermined temperature in which an electron-donating group compound is dissolved to produce nanocrystals with relatively uniform particle diameters. Crystals, the predetermined temperature in an organic solvent can break the ionic bonds of the nanocrystals.

[0027] The predetermined temperature is a temperature range that can break the ionic bonds of the nanocrystals in the organic solvent, but cannot completely decompose the nanocrystals into ions at the moment of adding, allowing the seeding growth of the nanocrystals. Different nanocrystals correspond to different predetermined temperatures.

[0028] In the present invention, the nanocrystals with relatively uneven particle diameters are instantly contacted with a high-temperature organic solvent, so that the ion bond...

Embodiment 1

[0048] Preparation of indium phosphide nanocrystals with uniform particle size: 1) Mix indium acetate, zinc acetate, octadecanoic acid, and octadecylamine, wherein the molar ratio of indium acetate to zinc acetate is 1:2, and add a small amount of octadecene solvent 2) Heating the mixture to 120°C under vacuum condition, and deoxidizing for 1 hour to obtain the precursor mixed solution of indium acetate and zinc acetate; 3) Heating the mixed solution to 180°C, and injecting Phosphine gas, until the mixed solution becomes light yellow, stop feeding the gas to obtain a relatively inhomogeneous indium phosphide nanocrystal dispersion; Add it into a certain amount of octadecene, stir evenly, and heat up to 245°C to obtain an organic solution at a predetermined temperature; 6) Add the cooled dispersion to a mixed solution of n-hexane and ethanol, centrifuge at high speed, and dissolve the obtained centrifugal precipitate with n-hexane, then add methanol to form The suspension was ...

Embodiment 2

[0050] Preparation of indium phosphide nanocrystals coated with zinc sulfide with uniform particle size: the same as in Example 1, the difference is that step 5) is: adding the indium phosphide nanocrystal dispersion with uneven particle size to 245 In the organic solution at ℃, keep warm for 5 seconds, add sulfur source dissolved in octadecene dropwise, keep warm for 5 minutes, and then lower the temperature.

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Abstract

The invention discloses a preparation method for nanocrystals. The preparation method comprises the following steps: 1) dissolving a first precursor substance in an organic solvent, wherein the firstprecursor substance contains metal ions needed for synthesis of the nanocrystals; and 2) carrying out heating to a first temperature, and adding a second precursor substance into the organic solvent containing the first precursor substance, wherein the second precursor substance contains non-metal ions needed for synthesis of the nanocrystals, and allowing the first precursor substance to contactwith the second precursor substance for a chemical reaction so as to form the nanocrystal with nonuniform particle sizes. According to the invention, quantum dots with low performance are prepared byusing the relatively simple method, and the quantum dots are convenient for storage and easy to mass-produce. If needed, the nanocrystals with relatively nonuniform particle sizes are used for preparing quantum dots with high performance and uniform particle sizes.

Description

[0001] This case is a divisional application with the application number 201610828099.3, the title of the invention is a method for preparing nanocrystals, and the filing date is September 19, 2016. [0002] This case claims all domestic priority rights of the earlier application (application number 201610075952.9, the title of the invention is a method for preparing nanocrystals, and the filing date is February 3, 2016). technical field [0003] The invention relates to a preparation method of nano crystals. Background technique [0004] Quantum dots, also known as nanocrystals or nanocrystals, are materials with a size of several nanometers, usually in the range of 1-20 nanometers, and a crystalline structure. Quantum dots can fluoresce when excited by an appropriate light source or voltage. Quantum dots have been extensively studied in the past two decades due to their special properties, such as size-tunable optical properties, high quantum efficiency, relatively narrow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/08
CPCC01B25/087C01P2004/64
Inventor 王允军
Owner SUZHOU XINGSHUO NANOTECH CO LTD
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