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Graphene/ferroferric oxide composite wave-absorbing material and preparation method thereof

A composite wave-absorbing material, the technology of ferroferric oxide, which is applied in the field of wave-absorbing materials, can solve the problems of polluted environment, low electrical conductivity, and difficulty in film formation

Active Publication Date: 2017-05-31
贵溪穿越光电科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its high density and poor high-temperature characteristics, it is usually compounded to obtain a good wave-absorbing material.
[0004] In the graphene / ferroferric oxide composite material prepared by the traditional method, it is difficult for the ferroferric oxide magnetic nanoparticles to be fully dispersed on the graphene oxide substrate; and during the reduction process, due to the addition of reducing agents such as hydrazine hydrate, not only It is toxic, pollutes the environment, takes a long time to reduce, and wastes energy; the conductivity of the prepared graphene / ferric oxide composite material is low, which affects the absorbing effect
In addition, the graphene / iron tetroxide composite material prepared by the traditional method is usually a powder structure with high density, difficult to form a film, narrow absorption frequency band, and poor microwave absorption performance.

Method used

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  • Graphene/ferroferric oxide composite wave-absorbing material and preparation method thereof
  • Graphene/ferroferric oxide composite wave-absorbing material and preparation method thereof
  • Graphene/ferroferric oxide composite wave-absorbing material and preparation method thereof

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preparation example Construction

[0028] The embodiment of the present invention provides a method for preparing a graphene / ferric oxide composite wave-absorbing material, comprising the following steps:

[0029] Preparation of graphene oxide dispersion, FeCl 2 solution and FeCl 3 solution;

[0030] Mix the above three liquids, stir and mix at 80-120 degrees (preferably 100 degrees) for 2-3 hours to obtain graphene oxide / Fe 3 o 4 Dispersions;

[0031] The graphene oxide / Fe 3 o 4 The dispersion was dried in vacuum to obtain graphene oxide / Fe 3 o 4 Aerogel;

[0032] The graphene oxide / Fe 3 o 4 Airgel heating to obtain graphene / Fe 3 o 4 airgel, the graphene / Fe 3 o 4 Aerogels were mechanically compressed to obtain graphene / Fe 3 o 4 Composite material; the graphene / Fe 3 o 4 Composite materials are layered structures in which sheets are stacked.

[0033] The preparation method of the graphene / ferric oxide composite wave-absorbing material provided by the embodiment of the present invention makes f...

Embodiment 1

[0049] Preparation of graphene oxide: graphene oxide was prepared by the Hummer method, and graphene oxide dispersion was prepared after ultrasonic peeling, with a concentration of 0.8 mg / ml;

[0050] Graphene paper / Fe 3 o 4 Preparation of composite absorbing material:

[0051] Dissolve 0.4g of graphene oxide powder in 100ml of water, ultrasonicate for 35 minutes, and the ultrasonic frequency is 200-300Hz to form a graphene oxide dispersion with a concentration of 4mg / ml;

[0052] Weigh 0.4g FeCl 2 4H 2 O and dissolved in 20ml water, weighed 1g FeCl 3 ·6H 2 O and dissolved in 40ml of water;

[0053] The above prepared solution was added to the graphene oxide solution, stirred at 100 degrees for 2.5 hours to form graphene oxide / Fe 3 o 4 Uniform dispersion (wherein Fe 3 o 4 The content is 25%, Fe 3 o 4 The particle size is 30nm);

[0054] Graphene oxide / Fe 3 o 4 The dispersion was freeze-dried for 24 h under vacuum to form graphene oxide / Fe 3 o 4 Aerogel;

[00...

Embodiment 2

[0058] Preparation of graphene oxide: graphene oxide was prepared by the Hummer method, and a graphene oxide dispersion was prepared after ultrasonic peeling, with a concentration of 7.5 mg / ml;

[0059] Graphene paper / Fe 3 o 4 Preparation of composite absorbing material:

[0060] Dissolve 0.4g of graphene oxide powder in 100ml of water, ultrasonicate for 40 minutes, and the ultrasonic frequency is 200-300Hz, to form a graphene oxide dispersion with a concentration of 4mg / ml;

[0061] Weigh 0.4g FeCl 2 4H 2 O and dissolved in 20ml water, weighed 1g FeCl 3 ·6H 2 O and dissolved in 40ml of water;

[0062] The above prepared solution was added to the graphene oxide solution, stirred at 100 degrees for 3 hours to form graphene oxide / Fe 3 o 4 Uniform dispersion (where Fe 3 o 4 The content is 45%, Fe 3 o 4 The particle size is 45nm);

[0063] Graphene oxide / Fe 3 o 4 The dispersion was freeze-dried for 24 h under vacuum to form graphene oxide / Fe 3 o 4 Aerogel;

[006...

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Abstract

The invention is applicable to the field of wave-absorbing materials, and provides a graphene / ferroferric oxide composite wave-absorbing material and a preparation method thereof. The preparation method comprises the following steps: preparing a graphene oxide dispersion solution, a FeCl2 solution and a FeCl3 solution; mixing the three solutions, and stirring at 80-120 DEG C for 2-3 hours to obtain a graphene oxide / Fe3O4 dispersion solution; carrying out vacuum drying on the graphene oxide / Fe3O4 dispersion solution to obtain a graphene oxide / Fe3O4 aerogel; and heating the graphene oxide / Fe3O4 aerogel to obtain a graphene / Fe3O4 aerogel, and carrying out mechanical pelleting on the graphene / Fe3O4 aerogel to obtain the graphene / Fe3O4 composite material, wherein the graphene / Fe3O4 composite material is in a lamellar laminated structure. The graphene / Fe3O4 composite wave-absorbing material can absorb electromagnetic waves rather than reflect electromagnetic waves due to the electromagnetic performance matching characteristic, thereby lowering the secondary pollution of electromagnetic waves to the environment.

Description

technical field [0001] The invention belongs to the field of wave-absorbing materials, in particular to a graphene / ferric oxide composite wave-absorbing material and a preparation method thereof. Background technique [0002] Absorbing materials refer to materials that can absorb electromagnetic wave energy projected onto its surface, and convert electromagnetic wave energy into heat energy or other forms of energy through the dielectric loss of the material. With the rapid development of modern science and technology and the continuous improvement of people's health quality requirements, the research and development of new high-efficiency absorbing materials has been widely concerned. [0003] Graphene is a two-dimensional material with a thickness of only a single carbon atom. Graphene not only has excellent mechanical, thermal and electrical properties, but also has good microwave absorption properties. The sheet structure of graphene is conducive to improving the multip...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 刘新科刘睿李奎龙何佳铸陈乐何祝兵俞文杰吕有明洪家伟
Owner 贵溪穿越光电科技有限公司
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