Nitrogen and chlorine co-doped graphene quantum dot with ultra-small size and dual-emission of blue light and green light, and preparation method of graphene quantum dot

A technology of graphene quantum dots and blue-green light, which is applied in the direction of graphene, chemical instruments and methods, and luminescent materials, can solve the problems of single fluorescence emission, large size, and single doping element, and achieve stable luminescence performance and experimental The effect of low equipment requirements and uniform size distribution

Inactive Publication Date: 2018-07-27
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the current problems of graphene quantum dots such as single doping elements, relatively large size, and single fluorescence emission, the present invention provides a nitrogen-chlorine co-doped graphene quantum dot with ultra-small size blue-green light dual emission. Graphene quantum dots contain N and Cl co-doped, the doping amount of N is 2~5.4atm%, the doping amount of Cl is 1~2.16atm%, the particle size distribution of graphene quantum dots is 0.8nm~2.0nm, the average Particle size is 1.5nm

Method used

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  • Nitrogen and chlorine co-doped graphene quantum dot with ultra-small size and dual-emission of blue light and green light, and preparation method of graphene quantum dot
  • Nitrogen and chlorine co-doped graphene quantum dot with ultra-small size and dual-emission of blue light and green light, and preparation method of graphene quantum dot
  • Nitrogen and chlorine co-doped graphene quantum dot with ultra-small size and dual-emission of blue light and green light, and preparation method of graphene quantum dot

Examples

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Effect test

Embodiment 1

[0024] 1) Preparation of nitrogen and chlorine co-doped graphene quantum dots-GQDs (48h) with ultra-small blue-green double fluorescence emission: Weigh 2mmol of citric acid and 2mmol of 1,2,4-triaminobenzene dihydrochloride respectively and 10 mL of deionized water, and stirred thoroughly for 30 minutes at a constant temperature of 25°C. The mixed solution was transferred into a polytetrafluoroethylene-lined reaction kettle, and after being kept at 200° C. for 48 hours, it was naturally cooled to room temperature to obtain a crude product of nitrogen and chlorine co-doped graphene quantum dots.

[0025] 2) Purification of nitrogen and chlorine co-doped graphene quantum dots: the crude product of the graphene quantum dots obtained in step 1) is put into a dialysis bag with a molecular weight cut-off of 3500Da, dialyzed for 24 hours, and then put into a molecular weight cut-off of 3000Da The dialysis bag, dialysis for 12 hours. Use a rotary evaporator to remove the residual so...

Embodiment 2

[0028] The difference between nitrogen and chlorine co-doped graphene quantum dots-GQDs (24h) with ultra-small size blue-green double fluorescence emission and that of Example 1 is that the hydrothermal reaction was kept at 200° C. for 24 hours.

Embodiment 3

[0030] 1) Preparation of nitrogen and chlorine co-doped graphene quantum dots-GQDs (1:2) with ultra-small blue-green double fluorescence emission: Weigh 2mmol of citric acid and 4mmol of 1,2,4-triaminobenzene di-salt respectively salt and 10 mL of deionized water, and stirred thoroughly at a constant temperature of 25°C for 30 minutes. The mixed solution was transferred into a polytetrafluoroethylene-lined reaction kettle, and after being kept at 200° C. for 24 hours, it was naturally cooled to room temperature to obtain a crude product of nitrogen and chlorine co-doped graphene quantum dots.

[0031] 2) Purification of nitrogen and chlorine co-doped graphene quantum dots: the crude product of the graphene quantum dots obtained in step 1) is put into a dialysis bag with a molecular weight cut-off of 3500Da, dialyzed for 24 hours, and then put into a molecular weight cut-off of 3000Da The dialysis bag, dialysis for 12 hours. Use a rotary evaporator to remove the residual solve...

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Abstract

The invention discloses a nitrogen and chlorine co-doped graphene quantum dot with an ultra-small size and dual-emission of blue light and green light, and a preparation method of the graphene quantumdot, and belongs to the technical field of nano-functional materials. According to the problems of single doped element, relatively large size, single fluorescence emission and the like in the priorgraphene quantum dots, citric acid is used as a carbon source according to the invention, 1,2,4-triaminobenzene dihydrochloride is used as a doping source, and a nitrogen source and a chlorine sourceare provided at the same time. Compared with the prior art in which hydrochloric acid is used as the chlorine doping source, the preparation method has reduced pollution of strong acids, and the preparation of the graphene quantum dot with an ultra-small size can be realized, wherein the minimum size reaches 0.8nm and the blue-green light dual-emission property is achieved. The preparation methodprovided by the invention is simple, and can be applied to large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of nanometer functional materials, and relates to a nitrogen-chlorine co-doped graphene quantum dot with ultra-small blue-green light double emission and a preparation method thereof. Background technique [0002] In recent years, more and more fluorescent nanomaterials, such as semiconductor quantum dots, nanocrystals, and fluorescent dyes, have attracted extensive attention. Among them, graphene quantum dots, as an emerging fluorescent material, can be widely used in biology, chemistry, physics, etc. due to their good photostability, biocompatibility, low toxicity, simple preparation, and high light resistance Fields, such as biological detection, solar cells, light-emitting diodes, photocatalysis, etc. In order to adjust the structure, luminescence and other characteristics of graphene quantum dots, improve application performance, and expand the application range, doping is often used to achieve modific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/196C01B32/194C09K11/65C09K11/61B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B2204/32C09K11/61C09K11/65
Inventor 杨丽丽孙雪魏茂彬刘晓艳刘惠莲杨伟强
Owner JILIN NORMAL UNIV
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