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Grapheme-ferroferric oxide composite material for absorbing high-frequency electromagnetic waves and preparation method thereof

A technology of ferric tetroxide and composite materials, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of small absorption frequency range, cumbersome methods, unfavorable actual production, etc., and achieve the effect of strong absorption characteristics and simple operation.

Inactive Publication Date: 2012-02-08
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the known absorbing materials, such as the absorption frequency range is too small, the material synthesis method is too cumbersome and not conducive to actual production, etc., so the research on nanocomposite absorbing materials still needs further efforts

Method used

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  • Grapheme-ferroferric oxide composite material for absorbing high-frequency electromagnetic waves and preparation method thereof
  • Grapheme-ferroferric oxide composite material for absorbing high-frequency electromagnetic waves and preparation method thereof
  • Grapheme-ferroferric oxide composite material for absorbing high-frequency electromagnetic waves and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) First synthesize graphene according to the method on document Nat.Nanotechnol.2009, 4, 30. Simply put, a certain amount of ethanol and sodium metal are added into the autoclave at the same time, and reacted at 220 degrees Celsius for 72 hours. Then the resulting product was burned in the air, and finally the produced product was washed several times with distilled water and ethanol to obtain graphene.

[0021] (2) 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] (3) The obtained product was heated to 350 degrees centigrade for 2 hour...

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 was finished, 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 was finished, 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 grapheme-ferroferric oxide composite material for absorbing high-frequency electromagnetic waves and a preparation method thereof. The preparation method comprises the following steps of: adding 0.08-0.12 gram of grapheme into 280-320 milliliters of water, adding 0.05-0.15 gram of Fe (NO3)3.9H2O into the solution for stirring, centrifugally separating, washing the precipitate with ethanol and distilled water for certain times, and drying in the vacuum environment; and heating to 350 DEG C in the argon atmosphere, and annealing for 2 hours to obtain grapheme-ferroferric oxide composite material for absorbing high-frequency electromagnetic waves. In a film prepared with the method, the absorbing strength is below -20 dB when the thickness of the film is 3-6 millimeters. The preparation method provided by the invention is easy to operate, is suitable for industrial production, and can be used for preparing the grapheme-ferroferric oxide composite material with high absorption characteristic on high-frequency electromagnetic waves.

Description

technical field [0001] The invention relates to a nanocomposite material. The invention also relates to a preparation method of the nanocomposite material. Specifically, it is a graphene / ferric oxide nanocomposite material with strong absorption characteristics for high-frequency electromagnetic waves and a preparation method. 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 ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
Inventor 陈玉金马杨朱春玲王铁石欧阳秋云齐立红
Owner HARBIN ENG UNIV
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