A kind of graphene powder with controllable shape and preparation method thereof

A technology of graphene powder and graphene, which is applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve difficult problems and achieve the effects of easy scale-up and mass production, high crystal quality, and excellent electrical conductivity

Active Publication Date: 2022-05-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As mentioned above, the current application of two types of graphene powders as thermal and conductive fillers have their own insurmountable problems

Method used

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  • A kind of graphene powder with controllable shape and preparation method thereof
  • A kind of graphene powder with controllable shape and preparation method thereof
  • A kind of graphene powder with controllable shape and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Heat the reaction furnace cavity to 900°C under a nitrogen protective atmosphere, add 50g of nickel chloride into the constant temperature zone of the reaction furnace cavity, and keep it warm for 2 minutes; feed the mixed gas of methane and hydrogen, and the flow rate of methane and hydrogen in the mixed gas The ratio is 1:50, the reaction time is 3min, and graphene is catalyzed on the surface of the reduced nickel chloride substrate. The prepared reactant was taken out under a nitrogen protective atmosphere. The resulting product is polyhedral (e.g. figure 1 ), with an average particle size of 6 μm. The prepared reactant was put into 3mol / L hydrochloric acid aqueous solution (etching solution), and kept at 80° C. for 30 min to completely remove the nickel in the graphene polyhedron, and filter the graphene powder After extraction, cleaning and drying, hollow graphene particles are obtained. structured as figure 2 shown. From the Raman spectrum of the obtained sa...

Embodiment 2

[0049] Under the protective atmosphere of argon, the reaction furnace cavity was heated to 900°C, 50g of nickel chloride was added to the constant temperature zone of the reaction furnace cavity, and kept for 2 minutes; the mixed gas of methane, hydrogen and argon was introduced, and the methane 1. The volume flow ratio of hydrogen and argon is 1:10:80, and the reaction time is 5 minutes, and the graphene is catalyzed and grown on the surface of the reduced nickel chloride substrate. The prepared reactant was taken out under an argon protective atmosphere. The resulting product is spherical (e.g. Figure 7 ), with an average particle size of 3 μm. The prepared reactant was put into 3mol / L hydrochloric acid aqueous solution (etching solution), and kept at 80° C. for 30 min to completely remove the nickel in the graphene polyhedron, and filter the graphene powder Gained graphene hollow microspheres after extraction, cleaning and drying.

Embodiment 3

[0051] Under the protective atmosphere of argon, the reaction furnace cavity was heated to 1000°C, 50g of copper sulfate was added to the constant temperature zone of the reaction furnace cavity, and kept for 2 minutes; the mixed gas of methane, hydrogen and argon was introduced, and the methane, The volume flow ratio of hydrogen and argon is 1:30:100, the reaction time is 20 minutes, and the graphene is catalyzed on the surface of the reduced copper sulfate substrate. The prepared reactant was taken out under an argon protective atmosphere. The resulting product is spherical (e.g. Figure 8 ), with an average particle size of 1 μm. Put the prepared reactant into 2mol / L sulfuric acid aqueous solution (etching solution), keep it warm at 80°C for 60min, completely remove the copper in the graphene polyhedron, and filter out the graphene powder , cleaning and drying the obtained graphene hollow particles.

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Abstract

The invention discloses a form-controllable high-quality graphene powder and a preparation method thereof, belonging to the field of new materials. The invention uses the metal salt of the transition group as a template, utilizes a chemical vapor deposition process, and catalyzes the growth of graphene on the surface of the metal salt (reduced to metal) under suitable temperature and atmosphere conditions. The obtained graphene powder can retain or remove the substrate according to the needs of the application to form a graphene / metal-shell-core composite structure or a graphene hollow cavity structure. By adjusting the reaction parameters, the particle size and shape of the graphene powder can be adjusted. The metal salt and the corresponding etching acid solution can be recovered and recycled, and the whole production process only consumes a certain amount of electric energy and reaction gas. The invention has the advantages of simple process, low production cost and easy mass production. The prepared graphene has high crystalline quality, excellent thermal conductivity and electrical conductivity, and can be used as a filler in many fields.

Description

technical field [0001] The invention relates to the technical field of new materials and their applications, in particular to a form-controllable graphene powder and a preparation method thereof. Background technique [0002] Studies have shown that graphene has excellent electrical and thermal conductivity, and its electron mobility can reach 200,000 cm 2 V -1 the s -1 , can achieve the highest current transfer density at room temperature, and the thermal conductivity is as high as 5300W m -1 K -1 , much higher than that of carbon nanotubes and diamond. In addition, graphene is a honeycomb perfect lattice composed of a single layer of carbon atoms, which has high structural and chemical stability. Therefore, graphene has great application potential in the fields of heat conduction, electric conduction, and electromagnetic shielding. [0003] Electrically and thermally conductive composite materials are widely used. Graphene is used in thermal and conductive composite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/186
CPCC01B32/186C01B2204/22C01B2204/24
Inventor 任文才马超群成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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