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Method for massively preparing high-quality graphene

A large-scale preparation and graphene technology, applied in the direction of graphene, nano-carbon, etc., can solve the problems of poor mechanical properties and electrical conductivity, complex technical process, inability to completely remove oxygen-containing functional groups, etc., to achieve small thickness and reduce damage Effect

Inactive Publication Date: 2013-01-16
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing graphene preparation technology process is complicated, and after graphite is oxidized, it contains more oxygen-containing functional groups, and the oxygen-containing functional groups cannot be completely removed during re-reduction, and the two-dimensional physical structure of graphite sheets will also be destroyed, making its mechanical properties and electrical conductivity Poor performance, or the thickness of the product is more than three carbon atomic layers thick (greater than 1nm)

Method used

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  • Method for massively preparing high-quality graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Prepare 200ml of 10wt% azodicarbonamide hot water solution, disperse 5g of expanded graphite in the above solution, stir and immerse for 150 minutes and ultrasonicate for 5 minutes to remove unreacted expanded graphite, wash and dry to obtain graphene, the average thickness of the sheet 0.98nm, oxygen content 2.13% (mass fraction).

Embodiment 2

[0025] Prepare 200ml of 15wt% azobisisobutyronitrile ethanol solution, disperse 8g of expanded graphite in the above solution, stir and immerse for 180 minutes, ultrasonic for 30 minutes, remove unreacted expanded graphite, wash and dry to obtain graphene, sheet The average thickness is 0.75nm, and the oxygen content is 2.81% (mass fraction).

Embodiment 3

[0027] Prepare 200ml of azobisisoheptanonitrile methanol solution of 12wt%, disperse 6g of expanded graphite in the above solution, stir and immerse for 600 minutes and ultrasonic for 60 minutes, remove unreacted expanded graphite, wash and dry to obtain graphene, and the sheets are averaged The thickness is 0.82 nm, and the oxygen content is 2.63% (mass fraction).

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Abstract

The invention discloses a method for massively preparing high-quality graphene. The method comprises the following steps of mixing a stripping agent and water, preparing a stripping agent solution of which the concentration is 0.2 to 50 weight percent; dispersing expanded graphene into the stripping agent solution in a mass ratio of the expanded graphene to the stripping agent solution of (0.1-10):100, stirring and dipping for 1 to 10h; and performing ultrasonic treatment for 5 to 300 minutes, filtering, washing and drying to obtain the graphene. The method has the advantages that the method is mild in preparation condition and easy to operate, and massive production is easily realized.

Description

technical field [0001] The invention belongs to a graphene preparation technology, in particular to a method for large-scale preparation of high-quality graphene with the assistance of physical dissociation by chemical reaction at room temperature or low temperature. Background technique [0002] Graphene is a flake graphite material with a thickness of one or several carbon atomic layers discovered by British scientists in 2004. Graphene has a very high electron transport rate due to its unique two-dimensional crystal structure, and is the material with the highest mechanical strength known. It has excellent electrical, mechanical, thermal and magnetic properties, and is a widely used of new materials. Due to its potential application prospects in many fields, the basic and applied research of graphene has become a hot research topic for scientists from all over the world. [0003] Since the discovery of graphene, the preparation of graphene has been a research hotspot. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/19
Inventor 郭向云王云伟童希立靳国强郭晓宁
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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