Foam metal-graphene composite material and preparation method thereof

Abstract

The invention discloses a foamed metal-graphene composite material and a preparation method thereof. The composite material comprises a foamed metal base layer and a graphene film layer on the base. The foamed metal-graphene composite material is prepared by an electrophoresis method. Specifically, it includes removing oil stains and oxides on the surface of metal foam substrates, preparing graphene by redox method, modifying graphene, and electrophoretic deposition of graphene on the surface of metal foam. In a certain electromagnetic wave band, metal foam-graphene composites have the structural advantages of light and porous metal foam, large specific surface area and good conductivity on the one hand, and are compatible with the excellent electrical conductivity and high dielectric strength of self-made graphene on the other hand. The electrical constant and a large number of defects and functional group residues make it more conducive to absorbing electromagnetic waves and other properties. The composite material has high electromagnetic shielding efficiency and can be used as an excellent electromagnetic shielding material.

Description

technical field

[0001] The invention belongs to the field of composite materials, in particular to a metal foam-graphene composite material and a preparation method thereof. Background technique

[0002] In today's society, with the popularization of various electronic products, electromagnetic waves of different wavelengths and frequencies are flooding every space. These electromagnetic waves not only seriously interfere with the normal use of electronic products, lead to information leakage of computers and other instruments, but also endanger human health. Therefore, improving the electromagnetic compatibility performance of electronic products and preventing electromagnetic wave radiation pollution have become urgent problems in today's world.

[0003] Porous metal foam has attracted extensive attention from researchers because of its light weight, high specific surface area, and good thermal conductivity. Secondary reflection and scattering loss, within a certain band,...

Examples

Embodiment 1

[0028] (1) Clean the foamed nickel substrate: PPI is 20, 90, 110, and three kinds of foamed nickel with a thickness of 1.5mm are immersed in a mixed solution of acetone and ethanol with a volume ratio of 1:1 and ultrasonically cleaned for 30 minutes, and then cleaned at 6mol / L Soak in HCl solution for 30 minutes to remove surface oxides, and finally wash with deionized water and dry for later use;

[0029] (2) Preparation of graphene: Using the improved hummer's method, add 50ml of 98% concentrated sulfuric acid to a 250ml beaker, heat the oil bath to 90°C, add 10g of K 2 S 2 o 8 and 10g P 2 o 5 , after dissolving, cool down to 80°C, add 12g of graphite powder to react for 4-5h, then cool to room temperature, add 2L of deionized water overnight, filter with suction, and dry at room temperature to obtain pre-oxidized graphite powder. Add 6g of pre-oxidized graphite powder to a beaker containing 230ml of concentrated sulfuric acid, stir in an ice bath for 30min, then gradual...

Embodiment 2

[0038] Select foamed nickel with a pore size of 110PPI and a thickness of 0.5mm, 1.0mm, and 1.5mm as the research object to prepare a foamed nickel-graphene composite material. The specific experimental steps are as follows:

[0039] (1) Clean the foamed nickel substrate: PPI is 110, and three kinds of foamed nickels with thicknesses of 0.5mm, 1.0mm, and 1.5mm are immersed in a mixed solution of acetone and ethanol with a volume ratio of 1:1 and ultrasonically cleaned for 30 minutes, and then cleaned in 6mol Soak in 1 / L HCl solution for 30 minutes to remove surface oxides, and finally wash with deionized water and dry for later use;

[0040] (2) prepare graphene with embodiment 1;

[0041] (3) Modified graphene: Weigh 45mg of graphene and 45mg of Mg(NO 3 ) 2 ·6H 2 O electrolyte was added in isopropanol to prepare an electrophoretic solution with a graphene concentration of 0.3 mg / ml, and ultrasonicated for 3 hours at room temperature to obtain an electrophoretic solution; ...

Embodiment 3

[0045] Replace the nickel foam with PPI20, the thickness is 1.5mm, the experimental steps are as follows:

[0046] (1) Clean the foamed nickel substrate: PPI is 20, and the foamed nickel with a thickness of 1.5 mm is immersed in a mixed solution of acetone and ethanol with a volume ratio of 1:1 and ultrasonically cleaned for 30 minutes, and then soaked in 6mol / L HCl solution for 30 minutes To remove surface oxides, finally wash with deionized water and dry for later use;

[0047] (2) prepare graphene with embodiment 1;

[0048] (3) Modified graphene: Weigh 15 mg of graphene and 30 mg of Mg(NO 3 ) 2 ·6H 2 O electrolyte is added in isopropanol, the concentration of preparation graphene is the electrophoretic liquid of 0.1mg / ml, ultrasonic 3h at room temperature, obtains electrophoretic liquid;

[0049] (4) Electrophoretic deposition: the above-mentioned cleaned nickel foam is used as the cathode, and the platinum electrode is used as the anode. Put it into the electrophoreti...

technical field

[0001] The invention belongs to the field of composite materials, in particular to a metal foam-graphene composite material and a preparation method thereof. Background technique

[0002] In today's society, with the popularization of various electronic products, electromagnetic waves of different wavelengths and frequencies are flooding every space. These electromagnetic waves not only seriously interfere with the normal use of electronic products, lead to information leakage of computers and other instruments, but also endanger human health. Therefore, improving the electromagnetic compatibility performance of electronic products and preventing electromagnetic wave radiation pollution have become urgent problems in today's world.

[0003] Porous metal foam has attracted extensive attention from researchers because of its light weight, high specific surface area, and good thermal conductivity. Secondary reflection and scattering loss, within a certain band,...

Examples

Embodiment 1

[0028] (1) Clean the foamed nickel substrate: PPI is 20, 90, 110, and three kinds of foamed nickel with a thickness of 1.5mm are immersed in a mixed solution of acetone and ethanol with a volume ratio of 1:1 and ultrasonically cleaned for 30 minutes, and then cleaned at 6mol / L Soak in HCl solution for 30 minutes to remove surface oxides, and finally wash with deionized water and dry for later use;

[0029] (2) Preparation of graphene: Using the improved hummer's method, add 50ml of 98% concentrated sulfuric acid to a 250ml beaker, heat the oil bath to 90°C, add 10g of K 2 S 2 o 8 and 10g P 2 o 5 , after dissolving, cool down to 80°C, add 12g of graphite powder to react for 4-5h, then cool to room temperature, add 2L of deionized water overnight, filter with suction, and dry at room temperature to obtain pre-oxidized graphite powder. Add 6g of pre-oxidized graphite powder to a beaker containing 230ml of concentrated sulfuric acid, stir in an ice bath for 30min, then gradual...

Embodiment 2

[0038] Select foamed nickel with a pore size of 110PPI and a thickness of 0.5mm, 1.0mm, and 1.5mm as the research object to prepare a foamed nickel-graphene composite material. The specific experimental steps are as follows:

[0039] (1) Clean the foamed nickel substrate: PPI is 110, and three kinds of foamed nickels with thicknesses of 0.5mm, 1.0mm, and 1.5mm are immersed in a mixed solution of acetone and ethanol with a volume ratio of 1:1 and ultrasonically cleaned for 30 minutes, and then cleaned in 6mol Soak in 1 / L HCl solution for 30 minutes to remove surface oxides, and finally wash with deionized water and dry for later use;

[0040] (2) prepare graphene with embodiment 1;

[0041] (3) Modified graphene: Weigh 45mg of graphene and 45mg of Mg(NO 3 ) 2 ·6H 2 O electrolyte was added in isopropanol to prepare an electrophoretic solution with a graphene concentration of 0.3 mg / ml, and ultrasonicated for 3 hours at room temperature to obtain an electrophoretic solution; ...

Embodiment 3

[0045] Replace the nickel foam with PPI20, the thickness is 1.5mm, the experimental steps are as follows:

[0046] (1) Clean the foamed nickel substrate: PPI is 20, and the foamed nickel with a thickness of 1.5 mm is immersed in a mixed solution of acetone and ethanol with a volume ratio of 1:1 and ultrasonically cleaned for 30 minutes, and then soaked in 6mol / L HCl solution for 30 minutes To remove surface oxides, finally wash with deionized water and dry for later use;

[0047] (2) prepare graphene with embodiment 1;

[0048] (3) Modified graphene: Weigh 15 mg of graphene and 30 mg of Mg(NO 3 ) 2 ·6H 2 O electrolyte is added in isopropanol, the concentration of preparation graphene is the electrophoretic liquid of 0.1mg / ml, ultrasonic 3h at room temperature, obtains electrophoretic liquid;

[0049] (4) Electrophoretic deposition: the above-mentioned cleaned nickel foam is used as the cathode, and the platinum electrode is used as the anode. Put it into the electrophoreti...

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