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Preparation method of functionalized graphene and application thereof

A technology of fossil and graphene, applied in the field of preparation of functionalized graphene, achieves the effects of low cost, simple process flow and low price

Active Publication Date: 2015-03-11
青岛泰联新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the field of graphene, people use plant polyphenols instead of toxic reducing agents such as hydrazines to reduce graphene oxide to prepare graphene (CN102219211A; J. Phys. Chem. C, 2011, 115, 20740-20746; Green Chem., 2011 , 13, 1655-1658; RSC Adv., 2014, 4, 34510-34518.), solved the environmental pollution problem in the reduction process of graphene oxide, but this kind of work still belongs to the category of graphene prepared by graphite oxide reduction method, Only the improvement of the traditional graphite oxide reduction method cannot completely overcome the various shortcomings of the above-mentioned graphite oxide reduction method to prepare graphene, such as the structural defects and performance loss of graphene, the complicated process and environmental pollution in the graphite oxidation process.
So far, no one has used plant polyphenols and / or their derivatives as dispersion aids for the preparation of graphene by liquid phase exfoliation.

Method used

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  • Preparation method of functionalized graphene and application thereof
  • Preparation method of functionalized graphene and application thereof
  • Preparation method of functionalized graphene and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Using water as solvent, add 0.5 wt% tannin acid, after being dissolved, add 10 wt% natural graphite flakes, in the ultrasonic power of 40 w, 25 ℃ water bath for 1 h, static Set for 48 h, take 3 / 4 of the upper dispersion. After the graphene dispersion is diluted 10 times, test its ultraviolet-visible light absorption spectrum ( figure 1 ), since tannic acid has no absorption above 400nm, the absorption of the dispersion at 660nm (A 660 =1.166) is the absorption of graphene, calculated according to Lambert-Beer's law (molar extinction coefficient 3620 L g -1 m -1 , J. Phys. Chem. C, 2011, 115, 5422-5428.), the concentration of the dispersion is 0.32 mg / ml. The dispersion was vacuum filtered, washed repeatedly with distilled water to remove free tannic acid, and the product was tested by infrared ( figure 2 ), the results showed that the signal peaks of the product corresponded one-to-one with tannic acid, and no new signal peak appeared, indicating that tannic acid w...

Embodiment 2

[0038] Using N, N-dimethylformamide as solvent, add 1 wt% tannic acid, after dissolving, add 5 wt% natural flake graphite, in the ultrasonic wave with a power of 125 w, Sonicate in a water bath at 25 °C for 1 h, let stand for 24 h, and take 3 / 4 of the upper dispersion. After the graphene dispersion was diluted 10 times, its absorbance at 660 nm was measured as 2.041 by UV-visible absorption spectrum, and the concentration of the dispersion was calculated according to Lambert-Beer's law to be 0.56 mg / ml. The statistical results of the atomic force microscope show that the tannic acid-functionalized graphene with a thickness of less than 3 nm accounts for about 88%.

Embodiment 3

[0040] Using N-methylpyrrolidone as a solvent, add larch bark extract with a mass fraction of 1 wt%, after being dissolved, add expanded graphite with a mass fraction of 5 wt%, and mechanically stir for 1 h at a stirring speed of 8000 r / min , the dispersion liquid was centrifuged at 1500 r / min for 60 min, and then the upper layer dispersion liquid was taken. After the graphene dispersion was diluted 10 times, its absorbance at 660 nm was measured to be 1.021 by means of UV-visible absorption spectroscopy. According to Lambert-Beer's law, the concentration of the dispersion was 0.28 mg / ml. The statistical results of the atomic force microscope show that the functionalized graphene with a thickness less than 3 nm accounts for about 84%.

[0041] Table 1 is a comparison between the present invention and other graphene preparation methods. It can be seen from the table that the graphene output per unit volume of the present invention is the highest. In a recent article (Nat. Mate...

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Abstract

The invention discloses a preparation method of functionalized graphene and its application. The preparation method is as follows: graphite and / or its derivatives are used as raw materials; plant polyphenol and / or its derivatives are used as dispersing aids; water or one organic solvent or a mixed solvent of more organic solvents is used as a dispersion medium; and by an ultrasonic or stirring cutting method, the functionalized graphene is prepared by peeling graphite and / or its derivatives. The method has advantages of simple technological process, high yield of graphene, recyclable solvent, low cost, little pollution, good controllability and the like. The prepared functionalized graphene can be used in preparation of a polymer / graphene composite material directly or through further chemical modification. By the use of the functionalized graphene, mechanical properties, electrical property, thermal property, gas barrier property and the like of the material can remarkably be enhanced.

Description

technical field [0001] The invention relates to the field of graphene preparation, in particular to a preparation method and application of functionalized graphene. Background technique [0002] Graphene has shown great application potential in composite materials, energy environment, biomedicine, microelectronics and many other fields due to its excellent mechanical properties, electrical conductivity, thermal conductivity, flame retardancy, and gas barrier properties. The low-cost macro-preparation of high-quality graphene is the premise to support all applications. The preparation of graphene from graphite is currently the most effective way to obtain graphene materials, and its main preparation methods include graphite oxide reduction method and liquid phase exfoliation method. Among them, the graphite oxide reduction method has a relatively high yield and is currently the most important production method for commercial graphene. However, the resulting graphene suffers...

Claims

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Application Information

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IPC IPC(8): C08K9/04C08K9/00C08K3/04C08L7/00C08L63/00
Inventor 李琳赵帅辛振祥
Owner 青岛泰联新材料有限公司
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