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Graphene compounded wave absorbing material and preparation method thereof

A graphene composite and wave-absorbing material technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of long reaction time, complex preparation process, narrow absorption frequency band, etc., and achieve excellent wave absorption performance and wave absorption performance. Superior, short response time effect

Inactive Publication Date: 2017-03-08
INST OF DONGGUAN TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Like other carbon materials, the biggest disadvantage of graphene as an electromagnetic wave absorbing material is that it does not have magnetism and magnetic loss, but the huge specific surface area of ​​graphene provides infinite possibilities for its functional compounding
[0005] Traditional single absorbing materials (ferrite, carbon-based materials, ultra-fine magnetic metal powder, ceramic materials, etc.) have strong absorbing ability, but their density is generally large or the absorption frequency band is relatively narrow, so it is difficult to have strong absorption and low density at the same time. With the advantages of wide absorbing frequency band, etc., it cannot meet the needs of use
In addition, most of the existing wave-absorbing materials have complicated preparation process, long reaction time and high cost, making it difficult to achieve large-scale production

Method used

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  • Graphene compounded wave absorbing material and preparation method thereof
  • Graphene compounded wave absorbing material and preparation method thereof
  • Graphene compounded wave absorbing material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A preparation method of a graphene composite wave-absorbing material, comprising the steps of:

[0043] (1) Using natural flake graphite as raw material, graphite oxide was prepared by the improved Hummers method;

[0044] (2) Add the prepared graphite oxide into deionized water, ultrasonically disperse for 1 hour, and obtain a graphite oxide dispersion with a concentration of 1 mg / mL;

[0045] (3) Add spherical carbonyl iron into ethylene glycol, and disperse it ultrasonically for 1 hour to obtain a spherical carbonyl iron dispersion with a concentration of 6.67 mg / mL;

[0046] (4) Evenly mix the graphite oxide dispersion with the spherical carbonyl iron dispersion, ultrasonically and mechanically stir for 1 hour, and control the speed at 500 rpm / min to obtain a mixed solution;

[0047] (5) Take 200mL of the mixed solution, add 0.2mL of concentrated hydrochloric acid, then ultrasonically and mechanically stir for 1h, and control the speed at 500rpm / min;

[0048] (6) ...

Embodiment 2

[0053] A preparation method of a graphene composite wave-absorbing material, comprising the steps of:

[0054] (1) Using natural flake graphite as raw material, graphite oxide was prepared by the improved Hummers method;

[0055] (2) Add the prepared graphite oxide into deionized water, ultrasonically disperse for 1 hour, and obtain a graphite oxide dispersion with a concentration of 1 mg / mL;

[0056] (3) Add flaky carbonyl iron into ethylene glycol, and disperse it ultrasonically for 1 hour to obtain a flaky carbonyl iron dispersion with a concentration of 10 mg / mL;

[0057] (4) Evenly mix the graphite oxide dispersion with the flake carbonyl iron dispersion, ultrasonically and mechanically stir for 1 hour, and control the speed at 500 rpm / min to obtain a mixed solution;

[0058] (5) Take 200mL of the mixed solution, add 0.2mL of concentrated hydrochloric acid, then ultrasonically and mechanically stir for 1h, and control the speed at 500rpm / min;

[0059] (6) After the reac...

Embodiment 3

[0063] A preparation method of a graphene composite wave-absorbing material, comprising the steps of:

[0064] (1) Using natural flake graphite as raw material, graphite oxide was prepared by the improved Hummers method;

[0065] (2) Add the prepared graphite oxide into deionized water, ultrasonically disperse for 1 hour, and obtain a graphite oxide dispersion with a concentration of 1 mg / mL;

[0066] (3) Add fibrous carbonyl iron to ethylene glycol and disperse it ultrasonically for 1 hour to obtain a fibrous carbonyl iron dispersion with a concentration of 20mg / mL;

[0067] (4) Evenly mix the graphite oxide dispersion with the fibrous carbonyl iron dispersion, ultrasonically and mechanically stir for 1 hour, and control the speed at 500 rpm / min to obtain a mixed solution;

[0068] (5) Take 200mL of the mixed solution, add 0.2mL of concentrated hydrochloric acid, then ultrasonically and mechanically stir for 1h, and control the speed at 500rpm / min;

[0069] (6) After the re...

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Abstract

The invention relates to the technical field of microwave absorption and particularly relates to a graphene compounded wave absorbing material and a preparation method thereof. The graphene compounded wave absorbing material is prepared through uniformly compounding carbonyl iron and graphene. The preparation method comprises the steps: firstly, preparing graphite oxide by using an improved Hummers method, and then, uniformly dispersing the graphite oxide into a carbonyl iron dispersion solution; then, reducing the graphite oxide to graphene by using an ultrasonic reduction method, thereby preparing the graphene compounded wave absorbing material. Compared with the pure carbonyl iron and the pure graphene, the compounded wave absorbing material provided by the invention has the advantages that the wave absorbing performance is superior, the wave absorbing strength is high, the frequency band of wave absorbing is wide, and the density is relatively low; the compounded wave absorbing material has adjustability, high absorption at different frequencies is achieved through adjusting the mass ratio of the graphene to the carbonyl iron and the thickness of the compounded material.

Description

technical field [0001] The invention relates to the technical field of microwave absorption, in particular to a graphene composite wave-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 technology, etc. In the...

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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