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A kind of nitrogen-doped graphene quantum dot and its preparation method and application

A graphene quantum dot, nitrogen doping technology, applied in the field of fluorescent nanomaterials, can solve problems such as large difference in electronegativity

Active Publication Date: 2021-04-09
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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  • A kind of nitrogen-doped graphene quantum dot and its preparation method and application
  • A kind of nitrogen-doped graphene quantum dot and its preparation method and application
  • A kind of nitrogen-doped graphene quantum dot and its preparation method and application

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Experimental program
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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 and its preparation method and application, belonging to the technical field of fluorescent nanometer materials. The preparation method of the nitrogen-doped graphene quantum dots comprises: hydrothermally reacting an aqueous solution containing aminopyrene under alkaline conditions to prepare the nitrogen-doped graphene quantum dots. The present invention adopts aminopyrene as carbon source and nitrogen source at the same time for the first time, and prepares graphene quantum dots with blue fluorescence by one-step hydrothermal method in alkaline solution. The preparation method is simple, easy to operate, and high in yield. High rate. The synthesized nitrogen-doped graphene quantum dots have 2-3 layers of graphene thickness, uniform size, and single crystallinity; its fluorescence can be specifically quenched by iron ions and cytochrome C, and is expected to be used in trace iron ions or cells Selective detection of pigment C; in addition, the nitrogen-doped graphene quantum dots synthesized by the method of the present invention have electrochemiluminescent properties, and are expected to construct a highly sensitive 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 Patents(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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