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Method for preparing few-layer graphene by using auxiliary reagent

A few-layer graphene and reagent technology, applied in the field of nanomaterials, can solve the problems of cumbersome process, high cost, and poor quality, and achieve the effect of simple operation, less structural defects, and complete planar structure

Inactive Publication Date: 2015-06-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of complicated process, high cost, low yield and poor quality existing in the existing graphene technology, the present invention provides a method for preparing high-quality few-layer graphene, which uses conventional reagents and has simple steps. The invention is realized like this:

Method used

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  • Method for preparing few-layer graphene by using auxiliary reagent
  • Method for preparing few-layer graphene by using auxiliary reagent
  • Method for preparing few-layer graphene by using auxiliary reagent

Examples

Experimental program
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Effect test

Embodiment 1

[0020] (1) When the ambient temperature is not higher than 50°C, mix 1g of natural graphite powder with 5g of ammonium citrate, put it into a ball mill jar with a diameter of 8cm and a volume of 100mL, mill at 400rpm for 12h, cool to room temperature, and take out the mixture;

[0021] (2) Disperse the mixture in 800mL distilled water, stir it mechanically at a rate of 500rpm for 30min, then let the dispersion stand still, after layering, collect the upper layer dispersion liquid for suction filtration, wash the filtrate with distilled water to remove ammonium citrate, until the washing liquid is neutral;

[0022] (3) Add distilled water to the filtrate to re-disperse, centrifuge the dispersion at 2000 rpm for 10 min, take the upper suspension, and repeat the centrifugation twice.

[0023] (4) Suction-filter the upper layer suspension obtained by the second centrifugation again, dry the suction-filtered product together with the filter membrane at 60°C, and finally scrape t...

Embodiment 2

[0025] (1) Mix 1g of natural graphite powder with 5g of azodicarbonamide, put it into a ball mill jar with a diameter of 8cm and a volume of 100mL, mill at 400rpm for 24h, cool to room temperature, and take out the mixture;

[0026] (2) Prepare distilled water and ethanol at a volume ratio of 1:1 to make a dispersing solvent, disperse the mixture in 800 mL of dispersing solvent, ultrasonicate at a frequency of 40HZ for 30min, and then stand for stratification, collect the upper dispersion liquid, and analyze the dispersion The liquid is subjected to suction filtration, the filtrate is washed with a dispersing solvent, and azodicarbonamide is removed until the color of the washing liquid is colorless;

[0027] (3) Add a dispersing solvent to the filtrate to re-disperse, centrifuge the dispersion at 2000rpm for 10min, take the upper suspension, and repeat the centrifugation twice.

[0028] (4) Suction-filter the upper layer suspension obtained by the second centrifugation again,...

Embodiment 3

[0034] (1) Mix 1g of natural graphite powder with 20g of sodium hydroxide, put it into a ball mill jar with a diameter of 10cm and a volume of 250mL, mill at 300rpm for 8h, cool to room temperature, and take out the mixture.

[0035] (2) Disperse the mixture in 1000mL of distilled water, stir mechanically for 30min, let stand to separate layers, and collect the upper dispersion.

[0036] (3) Centrifuge the dispersion at 1000rpm for 10min, take the upper suspension, then centrifuge at 2000rpm for 10min, take the upper suspension.

[0037] (4) Transfer the obtained dispersion to a dialysis bag for dialysis to remove Na + and other impurity ions.

[0038] (5) Suction-filter the dispersion, dry the suction-filtered product together with the filter membrane at 60°C, and finally scrape off the product from the filter membrane to obtain a few-layer graphene powder.

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Abstract

The invention discloses a method for preparing few-layer graphene by using an auxiliary reagent. The method specifically comprises the following steps: (a) adding graphite and the auxiliary reagent into a ball-milling tank for ball-milling; (b) adding a dispersing solvent into the mixture, and performing suction filtration on the obtained upper-layer dispersion liquid; (c) adding the dispersing solvent into the filtrate, stirring, leaving the mixture to stand, and centrifuging the upper-layer dispersion liquid twice; (d) performing suction filtration to the upper-layer suspension, and drying so as to obtain a dried product, that is, the few-layer graphene. The few-layer graphene obtained by using the method disclosed by the invention is complete in plane structure, small in structural defects and relatively high in conductivity, heat conduction and mechanical property, and meanwhile the reagents used in the method are all ordinary chemical reagents, so that the method is simple to operate and easy to popularize and use.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a method for preparing few-layer graphene by using auxiliary reagents. Background technique [0002] Carbon nanomaterials have a unique structure and excellent physical properties, and have become a hot spot in scientific research in recent years. Among them, carbon nanotubes and graphene have attracted the most attention. In 2004, scientists successfully prepared graphene for the first time by mechanical exfoliation ( Science 2004 ,306,666-669), broke the theory of condensed matter physics, and the prediction in the traditional theory that a perfect two-dimensional structure cannot exist stably at a non-absolute zero temperature, and had a major impact on the development of condensed matter physics. The thinnest material" won the 2010 Nobel Prize in Physics. Graphene is a completely sp 2 The quasi-two-dimensional crystal material composed of hybrid carbon atoms with a thic...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 李金焕王堂洋顾善群
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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