Preparation method of carbon quantum dots with high quantum yield

A carbon quantum dot, high-quantum technology, applied in the field of new functional materials, can solve the problems of long time consumption, complicated preparation method, high production cost, etc., and achieve the effect of reducing production cost, simple preparation method and short preparation time

Active Publication Date: 2020-03-13
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

[0007] In order to solve the technical problems in the existing carbon quantum dot preparation process, such as complex preparation methods, long time consumption, and high production cost, the present invention proposes a method for preparing carbon quantum dots with high quantum yield

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  • Preparation method of carbon quantum dots with high quantum yield
  • Preparation method of carbon quantum dots with high quantum yield
  • Preparation method of carbon quantum dots with high quantum yield

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preparation example Construction

[0035] A preferred embodiment of the present invention provides a method for preparing carbon quantum dots with a high quantum yield, comprising: first mixing a carbon source composed of citric acid and ascorbic acid with an alkali source composed of ethylenediamine and o-phenylenediamine A mixed solution is obtained in a solvent, and then the mixed solution is microwave-heated for a preset time to prepare carbon quantum dots.

[0036] In a specific embodiment, the molar ratio of citric acid and ascorbic acid forming the carbon source is (0.5~2):1, preferably 1:1, and the molar ratio of ethylenediamine and o-phenylenediamine forming the alkali source is ( 0.25~1):1, preferably 0.5:1; the molar ratio of carbon source and alkali source is (1~20):1, preferably 5:1; the volume of solvent is 1~50ml, preferably 10~30ml; The concentration of the carbon source in the mixed solution is 0.3-0.7mol / L, preferably 0.5mol / L; the microwave intensity during microwave heating is 100-700W; the ...

Embodiment 1

[0039] A carbon source composed of citric acid and ascorbic acid (the molar ratio of citric acid and ascorbic acid is 1:1) and an alkali source composed of ethylenediamine and o-phenylenediamine (the molar ratio of ethylenediamine and o-phenylenediamine is 1 :2) According to the molar ratio of carbon source and alkali source being 5:1, mix and add in 10ml ethylene glycol solvent, wherein the concentration of carbon source is 0.5mol / L, place it in a microwave oven, set the power of the microwave oven to 700W, and react Take it out after 3 minutes to obtain carbon quantum dots.

Embodiment 2

[0041] The only difference from Example 1 is that the molar ratio of carbon source to alkali source is 1:1.

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Abstract

The invention discloses a preparation method of carbon quantum dots with high quantum yield. The preparation method comprises the following steps: firstly, mixing a carbon source composed of citric acid and ascorbic acid, and an alkali source composed of ethylenediamine and o-phenylenediamine, adding an obtained mixture into a solvent to obtain a mixed solution, and then performing microwave heating on the mixed solution for preset time to obtain the carbon quantum dots. The preparation method of the carbon quantum dot with high quantum yield can solve the technical problems of complex preparation method, long time consumption, high preparation cost and the like in the existing carbon quantum dot preparation process.

Description

technical field [0001] The invention relates to the technical field of novel functional materials, in particular to a method for preparing carbon quantum dots with high quantum yield. Background technique [0002] Fluorescent nanoparticles are a kind of fluorescent material with nanoscale size, because nanomaterials have high specific heat capacity, high expansion coefficient, high reactivity, high toughness, high wave absorption and other properties that macroscopic materials do not have, so they become environmental science. , material science and biology and other subject hotspots. With the research on fluorescent nanoparticles in recent years, more and more fluorescent nanomaterials have poured into people's sight, and carbon quantum dots (abbreviated as carbon dots) are undoubtedly the most eye-catching, because it solves the problem of early semiconductor Quantum dots contain Cd 2+ , Pd 2+ The problem of heavy metals harmful to organisms and the environment has also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C09K11/65B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C01P2004/04C01P2004/64C09K11/65C01B32/15
Inventor 张正华张梦圆
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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