A kind of synthetic method of sandwich structure cofe@c/graphene electromagnetic wave absorbing material

A technology of absorbing materials and synthesis methods, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems that are difficult to put into production and large-scale use, the application range is not wide, and magnetic metals are easy to be oxidized, so as to prevent oxidation and be operable Strong and reproducible effect

Active Publication Date: 2020-06-12
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing microwave-absorbing composite materials, because the magnetic metal is easily oxidized, its application range is not wide, and it is difficult to put it into production and use on a large scale

Method used

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  • A kind of synthetic method of sandwich structure cofe@c/graphene electromagnetic wave absorbing material
  • A kind of synthetic method of sandwich structure cofe@c/graphene electromagnetic wave absorbing material
  • A kind of synthetic method of sandwich structure cofe@c/graphene electromagnetic wave absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Add ferric chloride, cobalt acetate and ammonium acetate to 60ml of ethylene glycol and stir to dissolve in 100ml of PTFE lining. The mass ratio of ferric chloride and cobalt acetate is 2:1, ammonium acetate The addition amount is 50 mg, and the mass ratio of ferric chloride, cobalt acetate and ammonium acetate is 0.54:0.25:0.50. The mixed solution was stirred at room temperature for 3 h to ensure complete dissolution and uniform mixing. Put the polytetrafluoroethylene lining into the reaction kettle, screw it tightly, and finally place it in the oven, and react at a constant temperature of 200 ° C for more than 5 hours.

[0030] (2) After the reaction, the reaction solution was cooled to room temperature, and the product was separated with a magnet. The obtained product was washed with water, washed with ethanol ultrasonically for several times, and dried in vacuum to obtain CoFe 2 o 4 powder.

[0031] (3) 120mgCoFe 2 o 4 The powder and 1 mg of commercial grap...

Embodiment 2

[0035] (1) Add ferric chloride, cobalt acetate and ammonium acetate to 60ml of ethylene glycol and stir to dissolve in 100ml of PTFE lining. The mass ratio of ferric chloride and cobalt acetate is 1:1, ammonium acetate The addition amount is 50 mg, and the mass ratio of ferric chloride, cobalt acetate and ammonium acetate is 0.27:0.25:0.50. The mixed solution was stirred at room temperature for 3 h to ensure complete dissolution and uniform mixing. Put the polytetrafluoroethylene lining into the reaction kettle, screw it tightly, and finally place it in the oven, and react at a constant temperature of 200 ° C for more than 5 hours.

[0036] (2) After the reaction, cool the reaction solution to room temperature, separate the product with a magnet, wash the obtained product with water, then ultrasonically wash it with ethanol several times, and dry it in vacuum to obtain cobalt ferrite powder.

[0037] (3) Disperse 120 mg of cobalt ferrite powder and 1 mg of commercial graphene...

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Abstract

The invention discloses a synthetic method of a CoFe-coated C / graphene electromagnetic wave absorbing material of a sandwich structure, and relates to an electromagnetic wave absorbing material. The method comprises the steps: preparing cobalt ferrite nanoparticles; separating and washing the precipitate obtained by the reaction to obtain uniform CoFe2O4 nanoparticles; dispersing the CoFe2O4 nanoparticles obtained by the reaction and graphene in water and ethanol mixed solution, carrying out ultrasonic treatment, then adding resorcinol, performing stirring, then adding formaldehyde solution, and continuously performing stirring to obtain a precipitate; and separating the precipitate obtained by the reaction, and reducing in a hydrogen atmosphere after drying to obtain the CoFe-coated C / graphene electromagnetic wave absorbing material of the sandwich structure. The method is simple to operate, high in operability and good in reproducibility, and the yield can reach 90%.

Description

technical field [0001] The invention relates to an electromagnetic wave absorbing material, in particular to a synthesis method of a sandwich structure CoFe@C / graphene electromagnetic wave absorbing material. Background technique [0002] With the advancement of science and technology, a large number of wireless communication devices have entered people's daily life. Although it has brought great convenience to life, electromagnetic radiation and pollution are also becoming more and more serious. The electromagnetic field transmits energy in the form of electromagnetic waves. Only by using electromagnetic wave-absorbing materials to convert electromagnetic waves into heat or other forms of energy can electromagnetic pollution be effectively eliminated. In addition, absorbing materials are also often used in radar stealth, which plays an important role in homeland defense. [0003] The absorbing mechanism of absorbing materials is generally electric loss and magnetic loss. D...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
Inventor 江智渊鲍苏苏
Owner XIAMEN UNIV
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