Low-temperature environmentally-friendly preparation method of nitrogen edge doped graphene

A graphene and edge technology, applied in the field of low-temperature environmental protection preparation, can solve the problems of difficult adjustment of experimental process parameters, influence of electronic conductivity, complex experimental conditions and mechanism, etc., and achieve the effect of improving electrochemical catalytic ability and high structural integrity

Active Publication Date: 2013-11-27
WENZHOU MEDICAL UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical vapor deposition method can prepare nitrogen-doped graphene with an area of ​​square centimeters, but this method must be completed at high temperature and in the presence of flammable gases. There are certain requirements for the safety of the experiment, and the experimental process parameters It is not easy to adjust, the experimental conditions and mechanism are too complicated, and it is difficult to control, and the graphene prepared by this method, because the nitrogen atoms are doped between the carbon-carbon conjugated double bonds, its electronic conductivity is greatly affected

Method used

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  • Low-temperature environmentally-friendly preparation method of nitrogen edge doped graphene
  • Low-temperature environmentally-friendly preparation method of nitrogen edge doped graphene
  • Low-temperature environmentally-friendly preparation method of nitrogen edge doped graphene

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) First, conduct solid-phase ball milling of graphite powder and chitosan to obtain a powder: mix graphite powder and chitosan solids in a mass ratio of 1:20 and add them to the ball mill tank. Continuous ball milling at a speed of 400r / min for 12 hours.

[0025] (2) Then mix the powder with water, centrifuge to remove excess graphite powder and chitosan: transfer the product to a sample bottle with deionized water, and then centrifuge at a speed of 4000r / min to remove unreacted chitosan and chitosan graphite powder.

[0026] (3) Finally, dialyze the solution obtained in step (2) with water until the solution is neutral: put the supernatant into a dialysis bag and replace deionized water repeatedly until the solution is neutral, and nitrogen-doped graphite with good dispersibility is obtained alkene.

Embodiment 2

[0028] (1) First, conduct solid-phase ball milling of graphite powder and chitosan to obtain a powder: mix graphite powder and chitosan solids in a mass ratio of 1:20 and add them to the ball mill tank. Continuous ball milling at a speed of 600r / min for 8 hours.

[0029] (2) Then mix the powder with water, centrifuge to remove excess graphite powder and chitosan: transfer the product to a sample bottle with deionized water, and then centrifuge at a speed of 3000r / min to remove unreacted chitosan and chitosan graphite powder.

[0030] (3) Finally, dialyze the solution obtained in step (2) with water until the solution is neutral: put the supernatant into a dialysis bag and replace deionized water repeatedly until the solution is neutral, and nitrogen-doped graphite with good dispersibility is obtained alkene.

[0031] Analyzing the properties of the products of Example 1 and Example 2: Observing the morphology of the product obtained by SEM, determining its thickness by AFM, ...

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Abstract

The invention relates to a low-temperature environmentally-friendly preparation method of nitrogen edge doped graphene, and belongs to the field of novel carbon nano-materials. The preparation method is characterized in that graphite powder and a nitrogen-containing polymer solid are mixed and subjected to continuous ball milling at a certain ball milling speed under the normal temperature and normal pressure so as to obtain a nitrogen edge doped graphene nanosheet, wherein no liquid agents are added during preparation. By analyzing through a scanning electron microscope and an atomic force microscope, the product is a lamellar structure which is uniform in dispersion and less than 1 nanometer in thickness. The analysis result of an X-ray photoelectron spectroscopy shows that the prepared product contains nitrogen, carbon, oxygen and other elements, and therefore, that the nitrogen edge doped graphene nanosheet is successfully prepared can be verified.

Description

technical field [0001] The invention relates to a low-temperature and environment-friendly preparation method of nitrogen edge-doped graphene, belonging to the field of novel carbon nanomaterials. Background technique [0002] Nitrogen-doped graphene is a new type of graphene derivative, which has been found to have good electrochemical catalytic properties and is expected to become a new generation of metal-free catalysts to replace metal platinum. It has been widely used in various fields, including Fuel cells, supercapacitors, lithium-ion batteries, solar cells, field emission transistors, biosensors, etc. [0003] The current preparation methods of nitrogen-doped graphene mainly include mechanical exfoliation method or graphite oxide reduction method to obtain graphene, and then doping nitrogen atoms through ammonia gas high temperature or ammonia plasma post-treatment; and chemical vapor deposition method discovered in recent research. The mechanical exfoliation method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184C01B32/19
Inventor 刘勇陈志晏露曾超戴黎明瞿佳
Owner WENZHOU MEDICAL UNIV
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