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Nitrogen-doped graphene quantum dot as well as preparation method and application thereof

A graphene quantum dot, nitrogen doping technology, applied in the field of nanomaterials, can solve the problems of low yield, not enough environmental protection, difficult to use, etc.

Active Publication Date: 2019-02-22
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nitrogen content in the nitrogen-doped graphene quantum dots obtained in the above method is still less, and does not contain active N-H bonds, and is difficult to be further chemically modified, making it difficult to be used in fields such as fluorescent probes. Moreover, the above-mentioned nitrogen-doped The preparation methods of heterographene quantum dots all have problems such as expensive cost, cumbersome process, low yield, and not being environmentally friendly, and are not suitable for mass production and application.

Method used

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  • Nitrogen-doped graphene quantum dot as well as preparation method and application thereof
  • Nitrogen-doped graphene quantum dot as well as preparation method and application thereof
  • Nitrogen-doped graphene quantum dot as well as preparation method and application thereof

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Embodiment 1

[0053] Nitrogen-doped graphene quantum dots 1 were prepared by the following steps:

[0054] Step (1), disperse 0.5g graphene powder in 20mL N-methylpyrrolidone, form the dispersion liquid that concentration is 25mg / mL, add 0.5g ammonium persulfate wherein, use the ultrasonic cleaner that power is 150W at 60 Ultrasonic treatment of the dispersion for 2 h at °C to obtain a mixture after ultrasonic treatment;

[0055] In step (2), add 10 mL of 30 wt% hydrogen peroxide to the ultrasonically treated mixture obtained in step (1), and then stir it at 120° C. with a magnetic stirrer at a speed of 500 rpm for oxidation treatment 6h to obtain the oxidized mixture;

[0056] Step (3), transfer the oxidized mixture obtained in step (2) to the reactor, continue to add 10mL of hydrogen peroxide with a concentration of 30wt% to it, and perform a solvothermal reaction at 220°C for 6h, and obtain crude product;

[0057] In step (4), the crude product obtained in step (3) is filtered through...

Embodiment 2

[0059] Nitrogen-doped graphene quantum dots 2 were prepared by the following steps:

[0060] The only difference with Example 1 is that the graphene powder in step (1) is replaced by carbon fiber, and the addition of carbon fiber is 1.2g.

[0061] Embodiment 2 obtains nitrogen-doped graphene quantum dot 2.

Embodiment 3

[0063] Nitrogen-doped graphene quantum dots 3 were prepared by the following steps:

[0064] The only difference with Example 1 is that the graphene powder in step (1) is replaced by carbon nanotubes, and the addition of carbon nanotubes is 0.2g.

[0065] Embodiment 3 obtains nitrogen-doped graphene quantum dot 3.

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Abstract

The invention provides a nitrogen-doped graphene quantum dot. The surface of the nitrogen-doped graphene quantum dot comprises C-N bonds and N-H bonds, the mean particle size of the nitrogen-doped graphene quantum dot is 2-4nm, the molar fraction of the element C is 73-87mol%, the molar fraction of the element O is 8-18mol%, and the molar fraction of the element N is 4-9mol%. By improving the preparation technology of the conventional nitrogen-doped graphene quantum dots, a graphene quantum dot of which the nitrogen content is 9mol% and of which the surface contains many N-H bonds having higher activity can be obtained, so that the graphene quantum dot can meet the requirement of performing chemical modification on the quantum dot in the field of biological medicine and can further serve as a fluorescence nano probe and other fluorescence detection materials for use.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a nitrogen-doped graphene quantum dot and its preparation method and application. Background technique [0002] Graphene quantum dots have a wide range of applications in the fields of biological imaging, disease diagnosis, and biological environment monitoring due to their unique fluorescence activity. By changing the size and surface functional groups of graphene quantum dots, their fluorescence properties can be controlled. In addition, , the fluorescence activity of graphene quantum dots can also be achieved by doping other elements (such as nitrogen, sulfur, boron, etc.), wherein, the size of nitrogen atoms and carbon atoms is the closest, and it is easiest to achieve doping. In the prior art A major research direction is to realize nitrogen-doped graphene quantum dots with different doping types and different doping amounts by changing the composition of raw materials and metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C09K11/65B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C01B32/184C01B2204/20C09K11/65
Inventor 河山辛琪宫建茹
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA