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Quantum dot and preparation method thereof

A quantum dot, organic technology, applied in the field of quantum dots, to achieve the effects of simple and safe synthesis conditions, good biocompatibility, and high fluorescence intensity

Inactive Publication Date: 2011-04-27
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the quantum dots reported in the prior art contain highly toxic elements such as Cd, Pb, Hg, As, etc.

Method used

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  • Quantum dot and preparation method thereof

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preparation example Construction

[0033] The invention discloses a preparation method of quantum dots, comprising:

[0034] adding sulfur powder into 1-octadecene and mixing to obtain a sulfur precursor solution;

[0035] Adding Zn salt, M salt, In salt and organic coating agent to 1-octadecene and heating to obtain a transparent solution, the M salt is Cu salt or Ag salt;

[0036] The transparent solution is heated under protective gas conditions, then mixed with the sulfur precursor solution, and reacted to obtain Zn x m y InS 1.5+x+0.5y quantum dots.

[0037] According to the present invention, the mixing method for obtaining the sulfur precursor solution is preferably ultrasonic dispersion to dissolve the sulfur powder in 1-octadecene. The Zn salt is zinc acetate, zinc stearate or zinc acetylacetonate. The Cu salt is copper acetate, copper acetylacetonate, copper iodide, cuprous iodide or cuprous acetate. The Ag salt is silver acetate, silver nitrate or silver acetylacetonate. The In salt is indium ...

Embodiment 1

[0050] Preparation of Zn 0.25 InS 1.75 quantum dot

[0051] Add 40mmol of sulfur powder into 80mL of 1-octadecene, and ultrasonically disperse at room temperature to dissolve the sulfur powder in 1-octadecene to obtain a sulfur precursor solution;

[0052] Add 0.025mmol of zinc acetylacetonate, 0.1mmol of indium acetylacetonate, and 0.4mmol of oleic acid into 4mL of 1-octadecene, and heat to 190°C under the protection of nitrogen to dissolve, forming a transparent solution;

[0053] Seal the above transparent solution, remove the air with nitrogen, and heat to 280°C under the protection of nitrogen, keep it for 20 minutes, add 0.6mL of sulfur precursor solution to react for 15 minutes, and cool to room temperature to obtain Zn 0.25 InS 1.75 quantum dots.

Embodiment 2

[0055] Preparation of Zn 0.25 Cu 0.1 InS 1.8 quantum dot

[0056] Add 40mmol of sulfur powder into 80mL of 1-octadecene, and ultrasonically disperse at room temperature to dissolve the sulfur powder in 1-octadecene to obtain a sulfur precursor solution;

[0057] Add 0.025mmol zinc acetylacetonate, 0.010mmol copper(II) acetylacetonate, 0.1mmol indium acetylacetonate, 0.4mmol oleic acid, and 0.4mmol hexadecylamine to 4mL 1-octadecene, and heat to 190°C under nitrogen protection. ℃ dissolved to form a transparent solution;

[0058] Seal the above transparent solution, remove the air with nitrogen, and heat to 240°C under the protection of nitrogen, keep it for 20 minutes, add 0.6mL of sulfur precursor solution to react for 15 minutes, and cool to room temperature to obtain Zn 0.25 Cu 0.1 InS 1.8 quantum dots.

[0059] The Zn that the embodiment of the present invention prepares 0.25 Cu 0.1 InS 1.8 The XRD pattern of quantum dots is as follows figure 1 shown. The Zn th...

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Abstract

The embodiment of the invention discloses a quantum dot and a preparation method thereof. The method comprises the following steps of: adding sulfur powder into 1-octadecenoic acid, and mixing to obtain sulfur precursor solution; adding a Zn salt, an M salt, an In salt and an organic encapsulant into 1-octadecenoic acid, and heating to obtain transparent solution, wherein the M salt is a Cu salt or an Ag salt; and heating the transparent solution in the presence of a protective gas, and mixing the heated transparent solution and the sulfur precursor solution to react to obtain the ZnxMyInS1.5<+>x<+>0.5y quantum dot. In the preparation method provided by the invention, the synthesis condition is simple. The quantum dot prepared by the invention does not contain highlytoxic elements, such as Cd, Pb, Hg, As and the like, and has relatively high biocompatibility. In addition, the quantum dot prepared by the method has high fluorescence intensity, so that the quantum dot can serve as a fluorescent probe which is combined with biomolecules, can be applied to living cell image formation, tracking and monitoring of protein, viruses or enzymes, DNA analysis, DNA biologic sensing, disease diagnosis and the like.

Description

technical field [0001] The invention relates to the technical field of quantum dots, more specifically, to a quantum dot and a preparation method thereof. Background technique [0002] Quantum dots, also known as nanocrystals, are a class of nanoparticles composed of II-VI or III-V elements, which have luminescent and electrical properties. Quantum dots are zero-dimensional semiconductor nanocrystals with a diameter of 1-12nm, approximately spherical, and can be dispersed in water or organic solvents to form colloids. Since the size of quantum dots is close to or even smaller than the Bohr radius of the electron-hole pairs of the corresponding semiconductor bulk material, the electrons and holes generated when excited are confined in a narrow three-dimensional space, thus exhibiting a quantum confinement effect. The quantum confinement effect makes quantum dots have quantized valence and conduction bands, and the quantized energy band energy leads to discrete emission spect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/62
Inventor 杨秀荣冯建李亚丽杨帆
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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