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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AI-Extracted Technical Summary

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 ...
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Method used

(1) the present invention adopts organic phenol, organic amine, peroxide, deionized water as raw material, has synthesized the nitrogen-doped carbon quantum dot that fluorescent performance is stable, chemical property is stable, can be dispersed in water and environment friendly;
(2) the inventive method realizes the regulation and control to nitrogen-doped carbon quantum dot structure, particle size, optical property by adjusting raw material proportioning, reaction time;
(3) the present invention is in nitrogen-doped carbon quantum dot preparation process, owing to added peroxide, peroxide decomposes and releases heat and makes system temperature rise, impels reaction to carry out effectively, thereby makes preparation process of the present invention need not External heating source, low energy consumption, low cost, and simple operation;
In sum, a kind of nitrogen-doped carbon quantum dot prov...
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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.

Application Domain

NanoopticsLuminescent compositions

Technology Topic

SolventIon +14

Image

  • Nitrogen-doped carbon quantum dot and preparation method thereof

Examples

  • Experimental program(3)

Example Embodiment

[0043] Example 1
[0044] The method for preparing nitrogen-doped carbon quantum dots of this embodiment includes the following steps:
[0045] (1) The oxidation reaction process of phenolic hydroxyl group
[0046] 1.28 g of phloroglucinol and 27 mL of deionized water were added to a 100 mL three-necked flask and stirred 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] 1.08 g of p-phenylenediamine was added to the brown solution in (1) above, and after stirring uniformly, it was quickly transferred to a 50 mL autoclave and allowed to stand and react for 5 min. Finally, a black reaction liquid was obtained.
[0049] (3) Purification and collection process of nitrogen-doped carbon quantum dots
[0050] Take the black reaction solution out of the 50 mL autoclave, transfer it to a centrifuge tube, and centrifuge at 8000 rpm for 5 min; remove the black liquid from the upper layer of the centrifuge tube, transfer it to a dialysis bag with a cut-off flow of 1000, and place it in deionized water at 80 ℃ Dialysis for 24 h. Finally, the purified nitrogen-doped carbon quantum dot solution was transferred to a vacuum drying oven and dried for 24 hours to obtain nitrogen-doped carbon quantum dots.

Example Embodiment

[0051] Example 2
[0052] The method for preparing nitrogen-doped carbon quantum dots of this embodiment includes the following steps:
[0053] (1) The oxidation reaction process of phenolic hydroxyl group
[0054] 1.28 g of phloroglucinol and 27 mL of deionized water were added to a 100 mL three-necked flask and stirred 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] 1.23 g of p-Phenylenetriamine was added to the brown solution in (1) above, and after stirring evenly, it was quickly transferred to a 50 mL autoclave and allowed to stand and react for 5 min. Finally, a black reaction liquid was obtained.
[0057] (3) Purification and collection process of nitrogen-doped carbon quantum dots
[0058] Take the black reaction solution out of the 50 mL autoclave, transfer it to a centrifuge tube, and centrifuge at 8000 rpm for 5 min; remove the black liquid from the upper layer of the centrifuge tube, transfer it to a dialysis bag with a cut-off flow of 1000, and place it in 80 ℃ deionized water Dialysis for 24 h. Finally, the purified nitrogen-doped carbon quantum dot solution was transferred to a vacuum drying oven and dried for 24 hours to obtain nitrogen-doped carbon quantum dots.

Example Embodiment

[0059] Example 3
[0060] The method for preparing nitrogen-doped carbon quantum dots of this embodiment includes the following steps:
[0061] (1) The oxidation reaction process of phenolic hydroxyl group
[0062] 2.26 g of anthratriol and 27 mL of deionized water were added to a 100 mL three-necked flask and stirred at room temperature to obtain an aqueous solution of anthratriol. Next, 11 mL of hydrogen peroxide aqueous solution (30 wt%) was added to the above anthratriol 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] 1.08 g of p-phenylenediamine was added to the brown solution in (1) above, and after stirring uniformly, it was quickly transferred to a 50 mL autoclave and allowed to stand and react for 5 min. Finally, a black reaction liquid was obtained.
[0065] (3) Purification and collection process of nitrogen-doped carbon quantum dots
[0066] Take the black reaction solution out of the 50 mL autoclave, transfer it to a centrifuge tube, and centrifuge at 8000 rpm for 5 min; remove the black liquid from the upper layer of the centrifuge tube, transfer it to a dialysis bag with a cut-off flow of 1000, and place it in 80 ℃ deionized water Dialysis for 24 h. Finally, the purified nitrogen-doped carbon quantum dot solution was transferred to a vacuum drying oven and dried for 24 hours to obtain nitrogen-doped carbon quantum dots.
[0067] In summary, the present invention provides a nitrogen-doped carbon quantum dot and its preparation method. The present invention uses organic phenols, organic amines, peroxides, and deionized water as raw materials to synthesize stable fluorescence and stable chemical properties. , Nitrogen-doped carbon quantum dots that can be dispersed in water and are environmentally friendly. In addition, the method of the present invention realizes the regulation of the structure, particle size, and optical performance of nitrogen-doped carbon quantum dots by adjusting the ratio of raw materials and the reaction time. In addition, the method of the present invention does not require an external heating source, has low energy consumption, low cost, and simple operation. At the same time, the nitrogen-doped carbon quantum dot material prepared by the method of the present invention does not contain heavy metals such as Cd and Te, and has a wider range of application fields compared with traditional quantum dot materials.

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Classification and recommendation of technical efficacy words

  • Stable fluorescence performance
  • chemically stable
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