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Broadband electromagnetic wave absorbing material based on three-dimensional porous structure of polyaniline graphene

A technology of three-dimensional porous and absorbing materials, which is applied in the direction of electrical components, magnetic field/electric field shielding, etc., can solve the problems of poor absorption strength, narrow frequency band, and failure of absorbing materials to take into account well, and achieve the effect of changing the absorption bandwidth and the absorption intensity

Active Publication Date: 2019-03-19
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional absorbing materials have narrow frequency bands and poor absorption strength, which cannot meet the working requirements of multi-band and high-performance equipment
In addition, the rapid popularization of new mobile electronic devices puts forward higher requirements on the weight of absorbing materials, while traditional absorbing materials, such as magnetic metals, metal oxides and ceramic materials, have a density of 3.0g / cm2. 3 The above cannot meet the needs of equipment weight reduction
[0004] Furthermore, the demand for wave-absorbing materials for new weapons and equipment pays more and more attention to technical indicators such as "strong absorption, wide frequency band, light weight, and thin thickness". Traditional wave-absorbing materials have been unable to give good consideration to these indicators.

Method used

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  • Broadband electromagnetic wave absorbing material based on three-dimensional porous structure of polyaniline graphene
  • Broadband electromagnetic wave absorbing material based on three-dimensional porous structure of polyaniline graphene
  • Broadband electromagnetic wave absorbing material based on three-dimensional porous structure of polyaniline graphene

Examples

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Effect test

Embodiment 1

[0047]A kind of broadband electromagnetic wave absorbing material based on polyaniline graphene three-dimensional porous structure described in the present invention, its preparation steps are as follows:

[0048] (1) Add single-layer graphene oxide into isopropanol, stir and sonicate for 1 h, and obtain a single-layer graphene oxide / isopropanol uniform dispersion system with a concentration of 0.6 mg / mL. The area of ​​a single layer of graphene oxide is 900 μm 2 , the thickness is 0.8nm, the oxygen content is about 50wt%, and the main functional groups are carboxyl, hydroxyl and epoxy groups;

[0049] (2) Add conductive polyaniline to isopropanol, stir and sonicate for 1 hour to obtain a polyaniline / isopropanol uniform dispersion system with a concentration of 0.2 mg / mL;

[0050] (3) Add the polyaniline solution into the graphene oxide solution, stir and mix for 1 hour to obtain a uniformly dispersed polyaniline / graphene oxide / isopropanol mixed system, and the mass ratio of ...

Embodiment 2

[0057] A kind of broadband electromagnetic wave absorbing material based on polyaniline graphene three-dimensional porous structure described in the present invention, its preparation steps are as follows:

[0058] (1) Add single-layer graphene oxide into ethanol, stir and sonicate for 1 h to obtain a single-layer graphene oxide / ethanol uniform dispersion system with a concentration of 0.8 mg / mL. The area of ​​a single layer of graphene oxide is 1600 μm 2 , the thickness is 0.9nm, the oxygen content is 70wt%, and the main functional groups are carboxyl, hydroxyl and epoxy groups;

[0059] (2) adding conductive polyaniline to ethanol, stirring and sonicating for 1 hour, to obtain a polyaniline / ethanol uniform dispersion system with a concentration of 0.4 mg / mL;

[0060] (3) Add the polyaniline solution into the graphene oxide solution, stir and mix for 1 hour to obtain a uniformly dispersed polyaniline / graphene oxide / ethanol mixed system, and the mass ratio of polyaniline to s...

Embodiment 3

[0067] A kind of broadband electromagnetic wave absorbing material based on polyaniline graphene three-dimensional porous structure described in the present invention, its preparation steps are as follows:

[0068] (1) Add single-layer graphene oxide into butanone, stir and sonicate for 1 h, and obtain a single-layer graphene oxide / butanone uniform dispersion system with a concentration of 1.2 mg / mL. The area of ​​a single layer of graphene oxide is 2500 μm 2 , the thickness is 1.3nm, the oxygen content is 30wt%, and the main functional groups are carboxyl, hydroxyl and epoxy groups;

[0069] (2) Add conductive polyaniline to methyl ethyl ketone, stir and sonicate for 1 hour to obtain a polyaniline / methyl ethyl ketone uniform dispersion system with a concentration of 0.8 mg / mL;

[0070] (3) Add the polyaniline solution to the graphene oxide solution, stir and mix for 1 hour to obtain a uniformly dispersed polyaniline / graphene oxide / butanone mixed system, and the mass ratio of...

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Abstract

The invention relates to a broadband electromagnetic wave absorbing material and particularly relates to a broadband electromagnetic wave absorbing material based on a polyaniline graphene three-dimensional porous structure. The wave absorbing material has a remarkable absorbing effect for incident electromagnetic waves in 4 to 18GHz frequency bands, the density is not larger than 25mg / cm3, and both the thickness and area are controllable. The density of the electromagnetic wave absorbing material is far smaller than that of wave absorbing materials such as carbonyl iron, carbon black and carbon fiber, the total mass per cubic metre is not larger than 25g, the reflectivity of the electromagnetic wave absorbing material for micro waves in a frequency range of 6 to 18GHz is lower than -10dB.

Description

technical field [0001] The invention relates to a broadband electromagnetic wave absorbing material, in particular to a broadband wave absorbing material based on a three-dimensional porous structure of polyaniline graphene. Background technique [0002] With the rapid development and popularization of information technologies such as remote sensing mapping, mobile communication, wireless network and radar detection, the electromagnetic radiation on the surface has surged, posing a serious threat to human health and the efficient and stable operation of electronic equipment. Research data show that normal adults exposed to high-frequency electromagnetic fields will experience physical discomfort after exposure to a certain intensity and time. In severe cases, it will cause neurasthenia, autonomic dysfunction, severe burns to the visual organs, and significant adverse symptoms of reproductive function. [0003] Secondly, the highly integrated electronic circuit system puts f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 张昳程红飞吴赛
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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