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Preparation method of graphene, graphene and application of graphene

A graphene and graphite technology, applied in the field of carbon material preparation, to achieve the effects of excellent thermal conductivity, uniform thickness and good quality

Inactive Publication Date: 2020-04-10
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the existing graphene preparation methods still have great limitations

Method used

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  • Preparation method of graphene, graphene and application of graphene
  • Preparation method of graphene, graphene and application of graphene
  • Preparation method of graphene, graphene and application of graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The graphene oxide is prepared by the Hummers method to obtain a graphene oxide-sulfuric acid solution, wherein the mass ratio of graphene oxide to 65 wt.% sulfuric acid is 1:300. Add reduced iron powder to the solution (the mass ratio of reduced iron powder to graphene oxide is (6:1), and react for 6 hours at 25°C. After the reaction is complete, wash with deionized water for several times to neutral, and dry under normal pressure for 12 hours. Partially reduced graphene oxide powder is obtained. The obtained powder is placed in a 700W microwave emitting device and reacted for 10 seconds to obtain graphene.

[0033] Such as figure 1 As shown, the prepared graphene is 2nm thick.

[0034] Further tests show that the radial thermal conductivity of the prepared graphene measured by laser flash method is 1531W / m·K; the prepared graphite has a conductivity of 134S / m measured by a comprehensive physical property measuring instrument.

Embodiment 2

[0036] Graphene oxide is prepared by Brodies method to obtain graphene oxide-nitric acid solution, wherein the mass ratio of graphene oxide to 50w.t% nitric acid is 1:20. Add reduced iron powder (the mass ratio of reduced iron powder to graphene oxide is 4:1) into the solution, and react for 4 hours at 20°C. After the reaction is completed, it is washed several times with deionized water to neutrality, and freeze-dried for 24 hours to obtain partially reduced graphene oxide powder. Place the obtained powder in a 500W microwave emitting device and react for 30 seconds to obtain graphene.

[0037] Such as figure 2 As shown, the thickness of the prepared graphite nanosheet is 1.5 nm.

[0038] Such as image 3 As shown, the XRD diffraction spectra of the graphene prepared in Examples 1 to 2 show that the (002) plane diffraction peak of graphene appears at 2θ=25°, which proves that graphene oxide is successfully reduced to graphene, which has the characteristics of graphene.

[0039] S...

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Abstract

The invention discloses a preparation method for preparing graphene based on a primary solution of graphite oxide, and belongs to the technical field of nano materials. The method comprises the following steps: by taking a primary solution of graphene oxide as a raw material, firstly adding a proper amount of metal to control partial reduction of graphite oxide, washing and drying to obtain powdery partially reduced graphite oxide, and then realizing rapid reduction and expansion of the partially reduced graphite oxide by utilizing microwave heating to finally obtain graphene. The process is simple and efficient in preparation process, no organic solvent harmful to the human body is introduced in the preparation process, and the prepared graphene is high in carbon-oxygen ratio, low in costand easy to realize large-scale production, and has a wide application prospect in the fields of functional composite materials and anticorrosive coatings.

Description

Technical field [0001] The invention relates to a method for preparing graphene, and belongs to the technical field of carbon material preparation. Background technique [0002] Since its inception, graphene has received widespread attention due to its different properties from traditional materials. Graphene is made of sp 2 A single carbon atom layer composed of hybrid carbon atoms, the C atoms of which are connected in a "head-to-head" manner, the C-C bond length is 0.142nm, and the single layer thickness is 0.7nm. Graphene has outstanding physical and chemical properties, such as excellent mechanical properties, high electrical conductivity (~10 6 S / cm), high thermal conductivity (5300W / m·K), molecular impermeability, etc. It can be seen that graphene has broad application prospects in the fields of heat dissipation and corrosion protection of electronic devices. [0003] At present, the commonly used preparation methods of graphene include mechanical exfoliation, chemical vap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B32/184
Inventor 孙文刘贵昌王立达邢中豪杨政清武婷婷
Owner DALIAN UNIV OF TECH
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