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A kind of preparation method of graphene

A technology of graphene and graphite, which is applied in the field of new material synthesis, can solve problems such as low output, high preparation cost, and complicated preparation process, and achieve the effects of high output, good mechanical properties, and simple preparation process

Active Publication Date: 2016-12-14
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods currently have some shortcomings, such as complex preparation process, use of various toxic and polluting chemical reagents, low yield and high preparation cost

Method used

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  • A kind of preparation method of graphene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of preparation method of graphene, comprises the following steps:

[0025] (1) Soak and stir the expanded graphite with 0.5mol / L hydrochloric acid and 0.1mol / L sodium hydroxide for 30 minutes, wash with deionized water until the solution is neutral, filter, and place the filtered expanded graphite at a temperature of Dry in a vacuum oven at 80°C for 6 hours;

[0026] (2) Put the dry expanded graphite in a muffle furnace with a nitrogen atmosphere, heat it to 1000°C, and keep it warm for 3 minutes after reaching 1000°C, so that the expanded graphite can be heated evenly;

[0027] (3) Transfer the expanded graphite to a steel cylinder filled with liquid nitrogen. After the liquid nitrogen has evaporated, place the expanded graphite in a muffle furnace with a temperature of 800°C and a nitrogen atmosphere, so that the expanded graphite is instantly heated and peeled off. , after cooling to room temperature, collect the solid product, which is graphene.

[0028] f...

Embodiment 2

[0030] A kind of preparation method of graphene, comprises the following steps:

[0031] (1) Soak and stir the natural phosphorus flake graphite with 1mol / L nitric acid and 0.5mol / L potassium hydroxide for 30 minutes, wash with deionized water until the solution is neutral, filter, and place the filtered natural phosphorus flake graphite Dry in a vacuum oven at 90°C for 5 hours;

[0032] (2) Place the dried natural phosphorus flake graphite in a muffle furnace with an argon atmosphere, heat it to 900°C, and keep it warm for 5 minutes after reaching 900°C, so that the natural phosphorus flake graphite is evenly heated;

[0033] (3) Transfer the natural phosphorus flake graphite to a steel cylinder filled with liquid argon. After the liquid argon is volatilized, place the natural phosphorus flake graphite in a muffle furnace with a temperature of 1000 ° C and an argon atmosphere to make the natural Phosphorus flake graphite is instantly exfoliated by heat, and after cooling to ...

Embodiment 3

[0036] A kind of preparation method of graphene, comprises the following steps:

[0037] (1) Soak and stir the artificial graphite with 0.8mol / L sulfuric acid and 0.5mol / L sodium hydroxide for 30 minutes, wash with deionized water until the solution is neutral, filter, and place the filtered artificial graphite at a temperature of Dry in a vacuum oven at 100°C for 4 hours;

[0038] (2) Put the dry artificial graphite in a muffle furnace with a nitrogen atmosphere, heat it to 1000°C, and keep it warm for 5 minutes after reaching 1000°C to make the artificial graphite evenly heated;

[0039] (3) Transfer the artificial graphite to a steel cylinder filled with liquid nitrogen. After the liquid nitrogen has volatilized, place the artificial graphite in a muffle furnace with a temperature of 900°C and a nitrogen atmosphere, so that the artificial graphite is instantly heated and peeled off. , after cooling to room temperature, collect the solid product, which is graphene.

[0040...

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Abstract

The invention provides a preparation method of graphene, comprising the following steps: soaking and stirring graphite in acid solution and alkali solution respectively, washing with deionized water until the solution is neutral, filtering and drying; placing the dried graphite in a protective In a muffle furnace with an inert gas atmosphere, heat it to 800-1000°C. After reaching the heating temperature, keep it warm for 3-5 minutes to make the graphite evenly heated; transfer the graphite to a steel cylinder filled with liquid inert gas, liquid nitrogen or liquid hydrogen , after the liquid inert gas, liquid nitrogen or liquid hydrogen has volatilized, the graphite is placed in a muffle furnace with a temperature of 800-1000 ° C and a protective gas atmosphere, so that the graphite is instantly heated and peeled off, cooled, and the solid product is collected , the solid product is graphene. The graphene preparation method provided by the present invention realizes green and pollution-free preparation of graphene, and has simple preparation process, wide source of raw materials, low cost, and easy realization of large-scale industrial production.

Description

technical field [0001] The invention relates to the field of new material synthesis, in particular to a method for preparing graphene. Background technique [0002] Graphene is a two-dimensional carbon atom crystal discovered by Andre K. Geim of the University of Manchester in 2004. Due to its unique structure and photoelectric properties, it has become a research hotspot in the fields of carbon materials, nanotechnology, condensed matter physics and functional materials, attracting many scientific and technological workers. Single-layer graphene has excellent electrical and thermal conductivity and low thermal expansion coefficient, and its theoretical specific surface area is as high as 2630m 2 / g (A Peigney, Ch Laurent, etal. Carbon, 2001, 39, 507), can be used in effect transistors, electrode materials, composite materials, liquid crystal display materials, sensors, etc. At present, the methods for preparing graphene mainly include graphite exfoliation (Novoselov K S, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04C01B32/19
Inventor 周明杰袁新生王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD