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Nitrogen-doped graphene quantum dot, preparation method and applications thereof

A technology of graphene quantum dots and nitrogen doping, which is applied in the field of fluorescent nanomaterials, can solve the problems of large differences in electronegativity, and achieve the effects of uniform size, high yield, and low price

Active Publication Date: 2019-12-31
广西医科大学附属肿瘤医院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the electronegativity difference between C(2.55) and N(3.04) is large

Method used

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  • Nitrogen-doped graphene quantum dot, preparation method and applications thereof
  • Nitrogen-doped graphene quantum dot, preparation method and applications thereof
  • Nitrogen-doped graphene quantum dot, preparation method and applications thereof

Examples

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Embodiment 1

[0041] 1. Hydrothermal synthesis of nitrogen-doped graphene quantum dots

[0042] After hydrothermal synthesis in a mixed aqueous solution of aminopyrene and sodium hydroxide for a certain period of time, the resulting solution is purified by dialysis and further freeze-dried to obtain a graphene quantum dot solid. Wherein, the concentration of aminopyrene is 0.5mg / mL, the concentration of sodium hydroxide is 0.2mol / L, the hydrothermal reaction temperature is 200°C, and the hydrothermal reaction time is 10h. After the reaction product was fully dialyzed through a dialysis bag with a molecular weight cut-off of 1000 Da, the solution in the dialysis bag was fully dialyzed again through a dialysis bag with a molecular weight cut-off of 3500 Da, and the solution outside the dialysis bag was the nitrogen-doped graphene quantum dot solution.

[0043] 2. Characterization and detection

[0044] Nitrogen-doped graphene quantum dots in specific example 1 are tested and characterized by...

Embodiment 2

[0058] 1. Hydrothermal synthesis of nitrogen-doped graphene quantum dots

[0059] After hydrothermal synthesis in a mixed aqueous solution of aminopyrene and sodium hydroxide for a certain period of time, the resulting solution is purified by dialysis and further freeze-dried to obtain a graphene quantum dot solid. Among them, the concentration of aminopyrene is 2.0mg / mL, the concentration of sodium hydroxide is 0.5mol / L, the hydrothermal reaction temperature is 180°C, and the hydrothermal reaction time is 6h. After the reaction product was fully dialyzed through a dialysis bag with a molecular weight cut-off of 1000 Da, the solution in the dialysis bag was fully dialyzed again through a dialysis bag with a molecular weight cut-off of 3500 Da, and the solution outside the dialysis bag was the nitrogen-doped graphene quantum dot solution.

[0060] 2. Characterization and detection

[0061] Nitrogen-doped graphene quantum dots in specific example 2 were tested and characterized...

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Abstract

The invention discloses a nitrogen-doped graphene quantum dot, a preparation method and applications thereof, and belongs to the technical field of fluorescent nanometer materials. The preparation method comprises: carrying out a hydrothermal reaction on an aminopyrene-containing aqueous solution under an alkaline condition to prepare the nitrogen-doped graphene quantum dot. According to the invention, the graphene quantum dots with blue fluorescence are prepared in the alkaline solution through the one-step hydrothermal method by simultaneously using aminopyrene as the carbon source and the nitrogen source, so that the preparation method is simple and easy to operate, the yield is high, and the fluorescence quantum yield of the product is high; the synthesized nitrogen-doped graphene quantum dot has 2-3 layers of graphene thickness, is uniform in size, and has single crystallinity; the fluorescence of the product can be specifically quenched by iron ions and cytochrome C so as to be expected to be used for selectively detecting trace iron ions or cytochrome C; and the nitrogen-doped graphene quantum dot synthesized by the method has electrochemical luminescence property, and is expected to construct a high-sensitivity electrochemical sensing system.

Description

technical field [0001] The invention relates to the technical field of fluorescent nanomaterials, in particular to a nitrogen-doped graphene quantum dot, a preparation method thereof, and an application in detecting iron ions or cytochrome C. Background technique [0002] Graphene quantum dots (GQDs) are zero-dimensional fluorescent carbon nanomaterials with lateral dimensions less than 10 nm and thicknesses less than 10 layers. According to the thickness, it can be divided into single-layer, double-layer and multi-layer graphene quantum dots. GQDs have the advantages of adjustable bandgap, easy surface modification, good biocompatibility, low cytotoxicity, stable photoluminescence, etc. It has potential application prospects in sensory and other fields. [0003] Compared with organic small molecule fluorescent probes, the synthesis method of graphene quantum dot fluorescent probes is simple and has good photostability; compared with semiconductor fluorescent quantum dots ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C09K11/65B82Y20/00B82Y40/00G01N21/64G01N21/76
CPCB82Y20/00B82Y40/00C01B2204/04C01B2204/20C09K11/65C01B32/184G01N21/6486G01N21/76
Inventor 罗涛唐卫中陈洁刘军杰赵昌
Owner 广西医科大学附属肿瘤医院
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