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Hydrothermal method for preparing graphene

A graphene and hydrothermal technology, applied in the direction of graphene, nano-carbon, etc., can solve the problems of high environmental pollution, small output, high cost, etc., and achieve the effect of easy-to-obtain raw materials and simple methods

Inactive Publication Date: 2012-07-18
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] To solve the problems of low efficiency, small output, high cost, high environmental pollution, etc.

Method used

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  • Hydrothermal method for preparing graphene
  • Hydrothermal method for preparing graphene
  • Hydrothermal method for preparing graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Natural flake graphite is prepared into expanded graphite (EG) by oxidative intercalation, and 0.1g of EG is weighed and immersed in 15mL, 0.5mol / L calcium chloride solution for 0.5h to obtain EG suspension solution (a); prepare 0.2mol 15 mL of urea solution per L was slowly added dropwise to the EG suspension solution (a) while stirring, and stood at room temperature for 3 hours to obtain the EG suspension solution (b); In a reaction kettle with ethylene as the substrate, react at 80°C for 10h; after the reaction, vacuum filter the product, wash it with deionized water until neutral, and dry it in vacuum at 20°C; disperse the product in absolute ethanol , ultrasonication for 0.5h to obtain a stable dispersion, vacuum filtration, washing with deionized water, and vacuum drying at 20°C to obtain graphene.

Embodiment 2

[0017] Natural flake graphite was prepared into expanded graphite (EG) by oxidative intercalation. Weighed 0.2g of EG and impregnated it into 15mL, 0.5mol / L calcium chloride solution for 1h to obtain EG suspension solution (a); prepared 1mol / L 15mL of urea solution, slowly added dropwise to the EG suspension solution (a) while stirring, and left to stand at room temperature for 6h to obtain the EG suspension solution (b); In the reaction kettle of the substrate, react at 100°C for 16h; after the reaction, vacuum filter the product, wash it with deionized water until neutral, and dry it in vacuum at 60°C; disperse the product in absolute ethanol, Ultrasound for 1 hour to obtain a stable dispersion, vacuum filtration, washing with deionized water, and vacuum drying at 60°C to obtain graphene.

[0018] figure 1 For the graphene AFM figure that embodiment 2 makes, figure 1 It can be seen that the thickness of graphene is about 2nm. Since the edge of graphene is warped and wrinkl...

specific Embodiment 3

[0020] Natural flake graphite was prepared into expanded graphite (EG) by oxidative intercalation, and 1g of EG was weighed and immersed in 15mL, 0.5mol / L calcium chloride solution for 1.5h to obtain EG suspension solution (a); prepared 1.6mol / L 15 mL of urea solution in L was slowly added dropwise to the EG suspension solution (a) while stirring, and stood at room temperature for 8 hours to obtain the EG suspension solution (b); In a reaction kettle with a substrate as the substrate, react at 150°C for 20h; after the reaction, vacuum filter the product, wash it with deionized water until neutral, and dry it in vacuum at 80°C; disperse the product in absolute ethanol , sonicated for 3 hours to obtain a stable dispersion, vacuum-filtered, washed with deionized water, and vacuum-dried at 80°C to obtain graphene.

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Abstract

The invention relates to graphene and particularly relates to a hydrothermal method for preparing graphene. The hydrothermal method belongs to the field of novel carbon materials. According to the hydrothermal method, expanded graphite, calcium chloride and urea are mixed in certain proportion, calcium carbonate is formed under a hydrothermal condition and serves as an intercalation agent, and the graphene is obtained after further reaction and preparation. The hydrothermal method for preparing the graphene is simple, and raw materials are easy to obtain, so that a new path for realizing graphene industrialization is provided.

Description

technical field [0001] The invention relates to graphene, in particular to a method for hydrothermally preparing graphene, and belongs to the field of novel carbon materials. Background technique [0002] Graphene has attracted widespread attention from scientists due to its unique crystal structure characteristics; it is a new carbonaceous material that is tightly packed into a two-dimensional honeycomb lattice structure by a single layer of carbon atoms, and has a large specific surface area. (2630m 2 / g), with a thickness of only 0.335nm, is the basic unit for constructing carbonaceous materials in other dimensions; graphene has a simple structure, room temperature quantum Hall effect, good ferromagnetism, excellent mechanical, electrical, thermal and optical properties, and can Widely used in electronics, composite materials and energy storage and other fields. [0003] There are two methods of preparing graphene: mechanical method and chemical method; mechanical metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 付猛祝雅娟陈志刚
Owner CHANGZHOU UNIV
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