Nitrogen-doped carbon quantum dot and preparation method thereof

A technology of carbon quantum dots and nitrogen doping, applied in the field of quantum dots, can solve the problems of high energy consumption, low quantum yield, and complicated preparation process, and achieve the effects of low energy consumption, stable fluorescence performance, and simple operation

Inactive Publication Date: 2019-04-19
TCL CORPORATION
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a nitrogen-doped carbon quantum dot and its preparation method, aiming to solve the problems of complex preparation process, high energy consumption, quantum The problem of low yield

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  • Nitrogen-doped carbon quantum dot and preparation method thereof

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Embodiment 1

[0044] The preparation method of the nitrogen-doped carbon quantum dots of this embodiment comprises the following steps:

[0045] (1), phenolic hydroxyl oxidation reaction process

[0046] Add 1.28 g of phloroglucinol and 27 mL of deionized water into a 100 mL three-necked flask respectively, and stir at room temperature to obtain an aqueous solution of phloroglucinol. Next, 11 mL of hydrogen peroxide aqueous solution (30 wt%) was added to the above phloroglucinol aqueous solution, and stirred at room temperature for 10 min to obtain a uniform brown solution.

[0047] (2), Schiff base polycondensation and carbonization reaction process

[0048] Add 1.08 g of p-phenylenediamine to the brown solution in (1) above, stir evenly, then quickly transfer it to a 50 mL autoclave, and let it stand for 5 minutes to react, and finally a black reaction solution is obtained.

[0049] (3) Purification and collection process of nitrogen-doped carbon quantum dots

[0050] Take out the black ...

Embodiment 2

[0052] The preparation method of the nitrogen-doped carbon quantum dots of this embodiment comprises the following steps:

[0053] (1), phenolic hydroxyl oxidation reaction process

[0054] Add 1.28 g of phloroglucinol and 27 mL of deionized water into a 100 mL three-necked flask respectively, and stir at room temperature to obtain an aqueous solution of phloroglucinol. Next, 11 mL of hydrogen peroxide aqueous solution (30 wt%) was added to the above phloroglucinol aqueous solution, and stirred at room temperature for 10 min to obtain a uniform brown solution.

[0055] (2), Schiff base polycondensation and carbonization reaction process

[0056] Add 1.23 g of p-phenylenediamine to the brown solution in (1) above, stir evenly, then quickly transfer it to a 50 mL autoclave, let it stand for 5 min to react, and finally obtain a black reaction solution.

[0057] (3) Purification and collection process of nitrogen-doped carbon quantum dots

[0058] Take out the black reaction so...

Embodiment 3

[0060] The preparation method of the nitrogen-doped carbon quantum dots of this embodiment comprises the following steps:

[0061] (1), phenolic hydroxyl oxidation reaction process

[0062] Add 2.26 g of anthracenol and 27 mL of deionized water into a 100 mL three-necked flask respectively, and stir at room temperature to obtain an aqueous solution of anthracenol. Next, 11 mL of hydrogen peroxide aqueous solution (30 wt%) was added to the above-mentioned anthracenol aqueous solution, and stirred at room temperature for 10 min to obtain a uniform brown solution.

[0063] (2), Schiff base polycondensation and carbonization reaction process

[0064] Add 1.08 g of p-phenylenediamine to the brown solution in (1) above, stir evenly, then quickly transfer it to a 50 mL autoclave, and let it stand for 5 minutes to react, and finally a black reaction solution is obtained.

[0065] (3) Purification and collection process of nitrogen-doped carbon quantum dots

[0066] Take out the bla...

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Abstract

The invention discloses a nitrogen-doped carbon quantum dot and a preparation method thereof. The method comprises the following steps: providing an organic phenol, mixing the organic phenol with peroxide in a solvent to carry out a phenolic hydroxyl oxidation reaction to obtain an organic hydrazine; and providing an organic amine to react with the organic hydrazine in a closed environment to obtain the nitrogen-doped carbon quantum dot. By using organic phenol, organic amine, peroxide and deionized water as raw materials, the nitrogen-doped carbon quantum dot which has stable fluorescence performance and stable chemical properties and is dispersible in water and environment-friendly is synthesized. By regulating the ratio of the raw materials and the reaction time, the structure, particlesize and optical performance of the nitrogen-doped carbon quantum dot are regulated. No heat source is needed by the method such that energy consumption is low, cost is low and operation is simple. Meanwhile, the nitrogen-doped carbon quantum dot material prepared by the method does not contain heavy metals such as Cd and Te, and has wider application fields than traditional quantum dot materials.

Description

technical field [0001] The invention relates to the field of quantum dots, in particular to a nitrogen-doped carbon quantum dot and a preparation method thereof. Background technique [0002] Due to their unique optical properties, quantum dot materials are considered to have a wide range of applications in optoelectronic displays, medical monitoring, biosensors and other fields, and have become a research hotspot. However, traditional quantum dot materials contain heavy metal elements such as Cd and Te, which are not only expensive, but also have strong biological toxicity; on the other hand, traditional quantum dot materials need to strictly control the moisture and oxygen content of the system during the preparation process , which puts strict requirements on the synthesis equipment and process of quantum dot materials. The above two aspects limit the application and development of quantum dot materials. [0003] In recent years, various environmentally friendly and low...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65
Inventor 丘洁龙
Owner TCL CORPORATION
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