A kind of composite absorbing material and preparation method thereof

A composite wave-absorbing material and hydrothermal reaction technology, applied in the field of wave-absorbing materials, can solve the problems of limited application range, complex preparation process, narrow frequency band, etc., and achieve the effects of excellent wave-absorbing performance, high electrical conductivity, and strong absorption strength

Active Publication Date: 2022-02-15
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For traditional graphene-based composite absorbers, graphene is usually used as a substrate to support nanoparticles. However, traditional graphene-based composite absorbers still have shortcomings such as narrow frequency bands, low efficiency, and complicated preparation processes, which lead to their application. limited in scope

Method used

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  • A kind of composite absorbing material and preparation method thereof
  • A kind of composite absorbing material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The embodiment of the present invention provides the first composite wave-absorbing material, the preparation method of which is as follows:

[0050] (1) Weigh the chemicals used, cobalt dichloride hexahydrate, urea, and ammonium fluoride, with a mass of 3.842g, 3.964g, and 0.977g, respectively, and add them to 330mL of distilled water, and ultrasonically stir for 0.5h-1h to form a uniform dispersion solution. Transferred to a hydrothermal reactor, 120 ° C hydrothermal reaction for 5 h, naturally cooled to room temperature, the obtained product was kept at 350 ° C in an argon atmosphere for 2 h, and then naturally cooled to room temperature to obtain 1.446 g of Co 3 o 4 ;

[0051] (2) will Co 3 o 4 and 8.640 g of Na 2 S was added to 180mL aqueous solution, sonicated for 0.5h-1h to form a uniform dispersion solution, hydrothermally reacted at 120°C for 24h, and then annealed at 500°C for 2h to obtain three-dimensional cobalt sulfide;

[0052] (3) Transfer 100 mg of ...

Embodiment 2

[0057] The embodiment of the present invention provides the second composite wave-absorbing material, the preparation method of which is as follows:

[0058] (1) Weigh the chemicals used, cobalt dichloride hexahydrate, urea, and ammonium fluoride, with a mass of 3.842g, 3.964g, and 0.977g, respectively, and add them to 330mL of distilled water, and ultrasonically stir for 0.5h-1h to form a uniform dispersion solution. Transferred to a hydrothermal reactor, 120 ° C hydrothermal reaction for 5 h, naturally cooled to room temperature, the obtained product was kept at 350 ° C in an argon atmosphere for 2 h, and then naturally cooled to room temperature to obtain 1.446 g of Co 3 o 4 ;

[0059] (2) will Co 3 o 4 and 8.640 g of Na 2 S was added to 180mL aqueous solution, sonicated for 0.5h-1h to form a uniform dispersion solution, hydrothermally reacted at 150°C for 24h, and then annealed at 500°C for 2h to obtain three-dimensional cobalt sulfide;

[0060] (3) Transfer 100 mg of...

Embodiment 3

[0064] The embodiment of the present invention provides a third composite wave-absorbing material, the preparation method of which is as follows:

[0065] (1) Weigh the chemicals used, cobalt dichloride hexahydrate, urea, and ammonium fluoride, with a mass of 3.842g, 3.964g, and 0.977g, respectively, and add them to 330mL of distilled water, and ultrasonically stir for 0.5h-1h to form a uniform dispersion solution. Transferred to a hydrothermal reactor, 120 ° C hydrothermal reaction for 5 h, naturally cooled to room temperature, the obtained product was kept at 350 ° C in an argon atmosphere for 2 h, and then naturally cooled to room temperature to obtain 1.446 g of Co 3 o 4 ;

[0066] (2) will Co 3 o 4 and 8.640 g of Na 2 S was added to 180mL aqueous solution, sonicated for 0.5h-1h to form a uniform dispersion solution, hydrothermally reacted at 180°C for 24h, and then annealed at 500°C for 2h to obtain three-dimensional cobalt sulfide;

[0067] (3) Transfer 100 mg of th...

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Abstract

The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a composite wave-absorbing material and a preparation method thereof. The invention provides a preparation method of a composite wave-absorbing material, comprising: step 1, dissolving cobalt source, urea and ammonium fluoride in water, carrying out hydrothermal reaction, cooling and annealing at high temperature to obtain Co 3 o 4 ; Step 2, Co 3 o 4 dissolving in water with sodium sulfide, performing hydrothermal reaction, and then annealing at high temperature to obtain three-dimensional cobalt sulfide; step 3, mixing three-dimensional cobalt sulfide with modifier aqueous solution for modification to obtain modified three-dimensional cobalt sulfide; step 4, modifying Composite three-dimensional cobalt sulfide and graphene oxide aqueous solution to obtain a primary cobalt sulfide / graphene oxide composite material; step 5, heat and reduce the primary cobalt sulfide / graphene oxide composite material, and dry to obtain a composite wave-absorbing material. The preparation method of the invention solves the technical defects of narrow frequency band, low efficiency and complicated preparation process that still exist in traditional graphene-based composite absorbing materials.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a composite wave-absorbing material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of science and technology, electronic equipment and communication facilities can be seen everywhere, closely connected with our lives, but its serious electromagnetic radiation has also become a source of pollution that we cannot ignore, not only causing harm to the human body, but also Industrial manufacturing has posed a huge obstacle. The problem of electromagnetic radiation has become another major pollution problem after water pollution and air pollution. Electromagnetic wave absorber (wave absorber) is a functional material that can effectively solve electromagnetic pollution, absorb electromagnetic waves, and reduce electromagnetic wave reflection and transmission. An ideal electromagnetic wave absorb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
Inventor 严成结张海燕张丹枫曾国勋
Owner GUANGDONG UNIV OF TECH
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