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Method for synthesizing cobalt oxide/graphene composite wave-absorbing material

A graphene composite and wave-absorbing material technology, applied in chemical instruments and methods, and other chemical processes, can solve problems such as single absorption frequency band, low absorption intensity, and high density, and achieve simple synthesis devices, simple methods, and high reaction efficiency high effect

Inactive Publication Date: 2015-01-07
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ideal absorbing materials require strong absorption, wide frequency band, low density, thin thickness, and good environmental stability. However, traditional absorbing materials are difficult to meet the above comprehensive requirements at the same time. There are mainly problems such as single absorption frequency band, high density, and low absorption strength.

Method used

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  • Method for synthesizing cobalt oxide/graphene composite wave-absorbing material
  • Method for synthesizing cobalt oxide/graphene composite wave-absorbing material
  • Method for synthesizing cobalt oxide/graphene composite wave-absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Prepare a solution of cobalt nitrate: weigh 1 g of cobalt nitrate hexahydrate, 0.3 g of ammonium fluoride and 1 g of urea, and dissolve it in 60 mL of distilled water to obtain an aqueous solution of cobalt nitrate (50 mM);

[0027] 2) Place the aqueous solution of cobalt nitrate prepared in step 1) in a hydrothermal kettle, and magnetically stir for 30 minutes;

[0028] 3) Put the hydrothermal kettle into an oven and keep it at 120°C for 8 hours to ensure that the reaction is complete. Finally, the pink turbid liquid was obtained, centrifuged, and the obtained precipitate was washed 3 times with ethanol solution to obtain the basic carbonate material;

[0029] 4) heating and drying the precipitate obtained in step 3), and controlling the temperature at 80°C;

[0030] 5) The dried sample obtained in step 4) was put into a tube furnace, and calcined at 300° C. for 2 hours with argon gas to obtain the product cobalt oxide material.

[0031] 6) Mix the sample prepared...

Embodiment 2

[0034] 1) Prepare a solution of cobalt nitrate: weigh 1g of cobalt nitrate hexahydrate, 0.3g of ammonium fluoride and 1g of urea, dissolve it in distilled water to obtain an aqueous solution of cobalt nitrate (50mM);

[0035] 2) Place the aqueous solution of cobalt nitrate prepared in step 1) in a hydrothermal kettle, and magnetically stir for 30 minutes;

[0036] 3) Preparation of graphene alcohol solution: Weigh 5 mg of graphene solid powder and disperse it in 5 mL of absolute ethanol solution to obtain graphene alcohol solution (concentration is 1 mg / mL);

[0037] 4) Inject the graphene alcohol solution prepared in step 3) into the cobalt nitrate aqueous solution in step 2), and mix well. Put the hydrothermal kettle into an oven and keep it at 120°C for 8 hours to ensure that the reaction is complete. Finally, the purple turbid liquid was obtained, centrifuged, and the obtained precipitate was washed 3 times with ethanol solution to obtain the basic carbonate / graphene mate...

Embodiment 3

[0043] 1) Prepare a solution of cobalt nitrate: weigh 1g of cobalt nitrate hexahydrate, 0.3g of ammonium fluoride and 1g of urea, dissolve it in distilled water to obtain an aqueous solution of cobalt nitrate (50mM);

[0044] 2) Place the aqueous solution of cobalt nitrate prepared in step 1) in a hydrothermal kettle, and magnetically stir for 30 minutes;

[0045] 3) Preparation of graphene alcohol solution: Weigh 10 mg of graphene solid powder and disperse it in 5 mL of absolute ethanol solution to obtain graphene alcohol solution (2 mg / mL);

[0046] 4) Inject the graphene alcohol solution prepared in step 3) into the cobalt nitrate aqueous solution in step 2), and mix well. Put the hydrothermal kettle into an oven and keep it at 120°C for 16 hours to ensure complete reaction. Finally, the purple turbid liquid was obtained, centrifuged, and the obtained precipitate was washed 3 times with ethanol solution to obtain the basic carbonate / graphene material;

[0047] 5) heating ...

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Abstract

The invention discloses a method for synthesizing a cobalt oxide / graphene composite wave-absorbing material and relates to nanometer wave-absorbing materials. The method comprises the following steps: (1) dissolving a metal cobalt salt, ammonium fluoride and urea in water, thereby obtaining a metal saline solution; (2) adding the metal saline solution prepared in the step (1) into a hydrothermal kettle, and magnetically stirring to be uniform; (3) dispersing graphene solid powder into an absolute ethyl alcohol solution, thereby obtaining a graphene alcohol solution; (4) adding the graphene alcohol solution prepared by the step (3) into the metal saline solution prepared in the step (2), mixing, stirring, putting the hydrothermal kettle into a drying oven for reacting, thereby obtaining purple turbid liquid; and centrifuging, washing the obtained precipitate by using the ethanol solution, thereby obtaining a subcarbonate / graphene material; and (5) heating and drying the subcarbonate / graphene material obtained in the step (4), calcining, thereby obtaining the product cobalt oxide / graphene composite wave-absorbing material. The method is simple, high in operability, mild in preparation conditions, clean and pollution-free in reaction process, high in reaction efficiency and high in reproducibility.

Description

technical field [0001] The invention relates to a nano wave-absorbing material, in particular to a synthesis method of a cobalt oxide / graphene composite wave-absorbing material. Background technique [0002] With the development of science and technology and the modern military field, electromagnetic radiation pollution is becoming more and more serious, and has gradually become the "fourth largest pollution source" after air pollution, water pollution and noise pollution. Electromagnetic radiation not only interferes with the normal operation of electronic instruments and equipment, but also affects people's health. In the military, with the development of detection technology, achieving the stealth of the target is of great significance to the survival and strike in international wars. At present, the most effective way to solve electromagnetic radiation pollution and achieve target stealth is to use electromagnetic wave absorbing materials (EAM). Absorbing material refe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
Inventor 江智渊林媛郑兰荪
Owner XIAMEN UNIV
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