Graphene-based ternary composite wave-absorbing material and preparation method thereof

A composite absorbing material, alkene-based ternary technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of absorbing strength and absorbing frequency band density, etc., achieve absorbing frequency bandwidth, reduce electromagnetic radiation, The effect of improving the absorbing performance

Inactive Publication Date: 2017-06-06
INST OF DONGGUAN TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the shortcomings and deficiencies of the traditional single absorbing material and the prior art, the object of the present invention is to provide a graphene-based ternary composite absorbing material, which has superior absorbing performance, high absorbing strength, The wave-absorbing frequency band is wide and the density is small; it is also adjustable, by adjusting the cladding layer SiO 2 The thickness, the mass ratio of graphene to the coated core-shell composite particles, and the thickness of the ternary composite achieve strong absorption at different frequencies

Method used

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  • Graphene-based ternary composite wave-absorbing material and preparation method thereof
  • Graphene-based ternary composite wave-absorbing material and preparation method thereof
  • Graphene-based ternary composite wave-absorbing material and preparation method thereof

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Embodiment 1

[0037] A preparation method of a graphene-based ternary composite wave-absorbing material, comprising the steps of:

[0038] (1) Preparation of silica-coated iron carbonyl core-shell composite particles

[0039] Add 2g of spherical carbonyl iron to a mixed solution of 160mL of absolute ethanol and 40mL of deionized water, ultrasonically and mechanically stir for 1h, then add 4mL of ammonia water and 4mL of ethyl orthosilicate to the mixed solution, at a reaction temperature of 40°C Mechanically stirred and reacted for 21 hours. After the reaction was completed, suction filtered and washed the product with deionized water and absolute ethanol until the filtrate was colorless, and dried at 40°C for 24 hours to obtain spherical carbonyl iron core-shell composite particles coated with silica. (SCI@SiO 2 ).

[0040] (2) Preparation of graphite oxide

[0041] Using natural flake graphite as raw material, graphite oxide was prepared by the improved Hummers method; the prepared gra...

Embodiment 2

[0047] A preparation method of a graphene-based ternary composite wave-absorbing material, comprising the steps of:

[0048] (1) Preparation of silica-coated iron carbonyl core-shell composite particles

[0049] Add 2g of flaky iron carbonyl to a mixed solution of 160mL of absolute ethanol and 40mL of deionized water, ultrasonically and mechanically stir for 1h, then add 4mL of ammonia water and 4mL of ethyl orthosilicate to the mixed solution, at a reaction temperature of 40°C Under mechanical stirring, react for 21 hours. After the reaction, filter with suction and wash the product with deionized water and absolute ethanol respectively until the filtrate is colorless, and dry at 40°C for 24 hours to obtain a silica-coated flaky carbonyl iron core-shell Composite particles (FCI@SiO 2 ).

[0050] (2) Preparation of graphite oxide

[0051] Using natural flake graphite as raw material, graphite oxide was prepared by the improved Hummers method; the prepared graphite oxide was...

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Abstract

The invention relates to the technical field of microwave absorption, in particular to a graphene-based ternary composite wave-absorbing material and a preparation method thereof. The preparation method comprises the steps of firstly, preparing silicon dioxide-coated carbonyl iron core-shell composite particles by using a sol-gel method, then preparing graphite oxide by using an improved Hummers method, evenly dispersing the graphite oxide into dispersion liquid of the silicon dioxide-coated carbonyl iron core-shell composite particles, and finally, using an ultrasonic reduction method to enable graphite oxide to be reduced into graphene so as to prepare the graphene-based ternary composite wave-absorbing material. The preparation method provided by the invention is simple and efficient; the prepared composite wave-absorbing material is more excellent in wave absorbing performance, high in wave absorbing strength, wide in wave absorbing bandwidth and smaller in density compared with a pure carbonyl iron binary composite wave-absorbing material and a pure graphene and carbonyl iron or graphene binary composite wave-absorbing material; the graphene-based ternary composite wave-absorbing material also has regulation performance, and can realize strong wave absorption under different frequencies by adjusting the thickness of a coating layer SiO2, the mass ratio of graphene to the coated core-shell composite particles and the thickness of the ternary composite material.

Description

technical field [0001] The invention relates to the technical field of microwave absorption, in particular to a graphene-based ternary composite microwave-absorbing material and a preparation method thereof. Background technique [0002] With the development of radar and microwave communication technology, especially the use of wireless communication tools, Internet and other communication equipment in the gigahertz range, people are increasingly concerned about electromagnetic interference and electromagnetic compatibility. Therefore, there is an increasingly urgent need to study electromagnetic wave shielding materials with high absorption capacity and broadband absorption. At present, microwave-absorbing materials are not only widely used in the field of military radar stealth, but also have many applications in civilian fields, such as microwave anechoic chamber materials, microwave attenuation components, electromagnetic compatibility, microwave forming processing techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 李宏强魏泽勇邱显洪武超赵莉丽
Owner INST OF DONGGUAN TONGJI UNIV
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