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A preparation method of high-quality nitrogen-doped graphene quantum dots

A graphene quantum dot and nitrogen doping technology, applied in the field of nanomaterials, can solve the problems of low carbonization degree and low carbon content graphene quantum dots, etc., and achieve the effects of high carbon content, good dispersibility, and high nitrogen content.

Active Publication Date: 2021-03-05
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbon dots synthesized by this method, because of their low degree of carbonization, sp 2 Less carbon content usually cannot be called graphene quantum dots

Method used

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  • A preparation method of high-quality nitrogen-doped graphene quantum dots
  • A preparation method of high-quality nitrogen-doped graphene quantum dots
  • A preparation method of high-quality nitrogen-doped graphene quantum dots

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Embodiment 1

[0029] Embodiment 1: Preparation of nitrogen-doped graphene quantum dots (NGQDs)

[0030] Weigh 1.345g (7mmol) of citric acid and 0.421g (7mmol) of ethylenediamine, add them to 70ml of ultrapure water, and then ultrasonicate for 10min at 200W to mix them evenly; transfer the ultrasonicated solution to 100ml of polytetrafluoroethylene In a vinyl fluoride reactor, react at 250°C for 6 hours to obtain a yellow-brown aqueous solution; take the solution and evaporate it under reduced pressure at 50°C to dryness to obtain a solid powder of nitrogen-doped graphene quantum dot "intermediate" . Weigh 0.2g of the "intermediate" of nitrogen-doped graphene quantum dots and add it to 70ml of N,N-dimethylformamide (DMF) and ultrasonically mix it uniformly under 200W for 10min; the solution after ultrasonic Transfer to a 100ml polytetrafluoroethylene reactor, and react at 250°C for 12 hours to obtain a brown DMF solution; finally, filter the DMF solution to remove large-sized products, and ...

Embodiment 2

[0040] Weigh 4.035g (21mmol) of citric acid and 0.421g (7mmol) of ethylenediamine, add them to 70ml of ultrapure water, and then ultrasonicate for 10min at 200W to mix them evenly; transfer the ultrasonicated solution to 100ml of polytetrafluoroethylene In a vinyl fluoride reactor, react at 180°C for 12 hours to obtain a yellow-brown aqueous solution; take the solution and evaporate it under reduced pressure at 50°C to dryness to obtain a solid powder of nitrogen-doped graphene quantum dot "intermediate" . Weigh 1.0g of the "intermediate" of nitrogen-doped graphene quantum dots and add it to 70ml of N,N-dimethylformamide, and then sonicate it for 10min at 200W to mix it evenly; transfer the sonicated solution to 100ml In a polytetrafluoroethylene reactor, react at 150°C for 6 hours to obtain a brown DMF solution; finally filter the DMF solution to remove large-sized products, and dialyze the filtrate in water to remove unreacted The complete "intermediate" as well as DMF, yie...

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Abstract

The invention provides a bottom-up method for preparing nitrogen-doped graphene quantum dots, which comprises the following two steps: 1) preparing nitrogen-doped graphene quantum dots with citric acid and ethylenediamine as raw materials "Intermediate"; 2) Further carbonization and dehydration of the "intermediate" by solvothermal method to prepare nitrogen-doped graphene quantum dots. The preparation method of the invention is simple, low in cost and capable of large-scale production. The nitrogen-doped graphene quantum dot prepared by the method has uniform size, good crystallinity, high nitrogen content, high fluorescence quantum yield, and good dispersion in water and common organic solvents.

Description

technical field [0001] The invention relates to a method for preparing high-quality nitrogen-doped graphene quantum dots, belonging to the technical field of nanomaterials. Background technique [0002] Graphene quantum dots (GQDs) refer to carbon core structures with a size of less than 100 nm and a height less than 10 layers of graphene, as well as edge-bonded chemical groups. Due to its remarkable quantum confinement effect and boundary effect, graphene quantum dots exhibit many novel physical and chemical properties, so it has very good application prospects in biological imaging, sensing, drug delivery, photovoltaic devices, etc. On the other hand, since the doping of nitrogen atoms can effectively adjust the energy level structure of graphene quantum dots and induce the formation of high local charges, thereby improving its optical, electrochemical and catalytic properties, nitrogen-doped graphene quantum dots are also has received more and more attention. However, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184B82Y40/00C09K11/65
CPCC01P2002/82C01P2002/85C01P2004/04C01P2004/64C09K11/65
Inventor 康龙田唐多思刘晶晶
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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