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Graphene and Fe3O4 nanometer material and preparation method for absorbing high-frequency electromagnetic waves

A technology of ferroferric oxide and nanomaterials, which is applied in the field of nanocomposite material preparation, can solve the problems of heavy absorber weight, large amount of addition, and limited application, and achieve the effects of wide application, less material and light material

Inactive Publication Date: 2011-12-28
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above materials all have certain deficiencies. Nanoparticles of Fe3O4, Fe3O4 / tin oxide, Fe3O4 / ZnO, etc. have high absorption strength and absorption frequency bandwidth, but they require a large amount of additives. amount, generally greater than 40wt%
Adding a large amount will significantly increase the weight of the absorber, which limits their application in some fields

Method used

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  • Graphene and Fe3O4 nanometer material and preparation method for absorbing high-frequency electromagnetic waves
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  • Graphene and Fe3O4 nanometer material and preparation method for absorbing high-frequency electromagnetic waves

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Effect test

Embodiment 1

[0021] (1) Take a 500 milliliter beaker, add 280-320 milliliters of water, then add 0.08-0.12 grams of graphene and stir to dissolve and disperse, then add 0.05 grams of Fe(NO 3 ) 3 9H 2 O, and the mixed solution obtained was stirred and reacted for two hours at 50 degrees Celsius in a water bath. After the reaction, cool to room temperature and centrifuge the precipitate in the obtained solution, wash with ethanol and distilled water several times, and dry under vacuum environment.

[0022] (2) The obtained product was heated to 350 degrees centigrade for 2 hours for annealing in an argon atmosphere. After cooling to room temperature, the graphene / Fe3O4 nanocomposite material was prepared by the above process.

Embodiment 2

[0024] (1) Take a 500 milliliter beaker, add 280-320 milliliters of water, then add 0.08-0.12 grams of graphene and stir to dissolve and disperse, then add 0.1 gram of Fe(NO 3 ) 3 9H 2 O, and the mixed solution obtained was stirred and reacted for two hours at 50 degrees Celsius in a water bath. After the reaction, cool to room temperature and centrifuge the precipitate in the obtained solution, wash with ethanol and distilled water several times, and dry under vacuum environment.

[0025] (2) The obtained product was heated to 350 degrees centigrade for 2 hours for annealing in an argon atmosphere. After cooling to room temperature, the graphene / Fe3O4 nanocomposite material was prepared by the above process.

Embodiment 3

[0027] (1) Take a 500 milliliter beaker, add 280-320 milliliters of water, then add 0.08-0.12 grams of graphene and stir to dissolve and disperse, then add 0.15 grams of Fe(NO 3 ) 3 9H 2 O, and the mixed solution obtained was stirred and reacted for two hours at 50 degrees Celsius in a water bath. After the reaction, cool to room temperature and centrifuge the precipitate in the obtained solution, wash with ethanol and distilled water several times, and dry under vacuum environment.

[0028] (2) The obtained product was heated to 350 degrees centigrade for 2 hours for annealing in an argon atmosphere. After cooling to room temperature, the graphene / Fe3O4 nanocomposite material was prepared by the above process.

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Abstract

The invention provides a graphene and ferric oxide nanometer material and a preparation method for absorbing high-frequency electromagnetic waves. Add 0.08-0.12 grams of graphene to 280-320 milliliters of water to dissolve, then add 0.05-0.15 grams of Fe(NO3)3.9H2O to the solution to obtain a mixed solution, and stir the mixed solution for two hours at 50 degrees Celsius in a water bath, and then The obtained precipitate was separated by centrifugation, washed several times with ethanol and distilled water, and dried in a vacuum environment; the obtained product was heated to 350 degrees Celsius under argon for annealing for 2 hours, and after cooling to room temperature, graphene was obtained with Fe3O4 nanocomposites. The film prepared by using the material of the invention has an absorption intensity below -20dB when the thickness is 3-6mm, and the absorption intensity of microwaves with frequencies around 5.5GHz and 7GHz exceeds -30dB respectively. Moreover, its absorption frequency width is large, less materials are used, and the material of the film material produced is lighter, which is more conducive to industrial production and has wider applications.

Description

technical field [0001] The invention relates to a nano-composite material with strong absorption properties for high-frequency electromagnetic waves, and also relates to a preparation method for the nano-composite material with strong absorption properties for high-frequency electromagnetic waves. Background technique [0002] In today's era, with the development of electronic technology, electromagnetic waves have filled every corner of the world. The impact of electromagnetic waves on the environment is also increasing day by day. At airports, airplanes cannot take off due to electromagnetic interference. In hospitals, telephones will interfere with electronic equipment and cause misdiagnosis of diagnostic instruments. Therefore, controlling electromagnetic wave pollution and finding a material that can resist and weaken electromagnetic wave radiation has become a major issue today. [0003] With the development of nanotechnology, people have gradually discovered that man...

Claims

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Application Information

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IPC IPC(8): C09K3/00
Inventor 陈玉金马杨王铁石欧阳秋云齐立红朱春玲
Owner HARBIN ENG UNIV
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