A preparation method of reduced graphene oxide/nickel oxide composite wave-absorbing material

A technology of composite materials and absorbing materials, applied in chemical instruments and methods, other chemical processes, etc., to achieve the effect of improving reflection loss, reducing quality, and achieving impedance matching

Inactive Publication Date: 2015-11-18
北京军通新材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after freeze-drying the mixed solution, and then using high-temperature pyrolysis to prepare composite wave-absorbing materials of graphene and nickel oxide, there have been no reports.

Method used

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  • A preparation method of reduced graphene oxide/nickel oxide composite wave-absorbing material
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  • A preparation method of reduced graphene oxide/nickel oxide composite wave-absorbing material

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Experimental program
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Embodiment 1

[0030] 1. Preparation of graphene oxide

[0031] Graphene oxide was prepared by the modified Hummers method as the precursor of composite absorbing materials.

[0032] Concrete preparation method is: take the graphite of 3g, mix with the sodium nitrate of 1.5g, measure the sulfuric acid of 150mL and slowly add in the above-mentioned solid, ice bath and slowly add the potassium permanganate of 9.0g under magnetic stirring, this process Continue for about 2 hours; remove the ice bath, bathe in 35°C water for about 5 days, slowly add 140mL of water, then add 350mL of water after 30 minutes, slowly add 20mL of 30% hydrogen peroxide, the solution gradually turns dark yellow; centrifuge the above solution And washed several times with water, the lower layer was taken and ultrasonicated for 2 hours, then centrifuged at 8000 rpm to get the upper layer, dialyzed for 15 days, and freeze-dried.

[0033] 1. Preparation of graphene oxide / nickel acetate mixture

[0034] (1) Weigh 100mg of...

Embodiment 2

[0041] 1, the preparation of graphene oxide is the same as embodiment 1.

[0042] 2. Preparation of graphene oxide / nickel acetate mixture

[0043] (1) Weigh 100mg of graphene oxide, ultrasonically disperse it in 50mL of water, and prepare a 2mg / mL aqueous solution;

[0044] (2) Weigh 100 mg of nickel acetate tetrahydrate, add to the above solution under magnetic stirring and fully dissolve;

[0045] (3) After fully dissolving, sonicate for half an hour;

[0046] (4) The obtained mixed solution was frozen and then dried.

[0047] 3. Preparation of graphene oxide / nickel oxide composite absorbing material

[0048] The above freeze-dried graphene oxide / nickel acetate mixture was taken out, put into a porcelain boat, and heated in an argon atmosphere of a tube furnace. The heating rate was 5°C / min, and when the temperature was raised to 400°C, the temperature was kept for 2 hours, and then the temperature was lowered at a rate of 5°C / min. After cooling down to room temperature...

Embodiment 3

[0050] 1, the preparation of graphene oxide is the same as embodiment 1.

[0051] 2. Preparation of graphene oxide / nickel acetate mixture

[0052](1) Weigh 100mg of graphene oxide, ultrasonically disperse it in 50mL of water, and prepare a 2mg / mL aqueous solution;

[0053] (2) Weigh 50 mg of nickel acetate tetrahydrate, add to the above solution under magnetic stirring and fully dissolve;

[0054] (3) After fully dissolving, sonicate for half an hour;

[0055] (4) The obtained mixed solution was frozen and then dried.

[0056] 3. Preparation of graphene oxide / nickel oxide composite absorbing material

[0057] The above freeze-dried graphene oxide / nickel acetate mixture was taken out, put into a porcelain boat, and heated in an argon atmosphere of a tube furnace. The heating rate was 3°C / min, and when the temperature was raised to 600°C, the temperature was kept for 2 hours, and then the temperature was lowered at a rate of 3°C / min. After cooling down to room temperature, ...

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Abstract

The invention discloses a reduced graphene oxide / nickel oxide composite wave absorbing material. Nickel oxide nanoparticles with the particle size of 1-100nm are uniformly distributed on a graphene nanosheet. The composite wave absorbing material has superior microwave absorbing performances: the lowest optimum reflection loss is -55.5dB, and the highest absorption frequency band below -10dB is 6.7GHz. The composite wave absorbing material has a light weight, and can meet the characteristics of light weight and high strength of wave absorbing materials. The invention discloses a preparation method of the composite wave absorbing material. The preparation method comprises the following steps: dissolving nickel acetate in a graphene oxide solution, freeze-drying, and carrying out high temperature pyrolysis on the obtained freeze-dried sample in argon atmosphere to prepare the wave absorbing material. The preparation method has the advantages of simplicity, environmental protection and low cost.

Description

technical field [0001] The invention relates to the field of electromagnetic microwave absorbing materials, in particular to a method for preparing a reduced graphene oxide / nickel oxide composite absorbing material. Background technique [0002] Stealth materials are also called wave-absorbing materials, whose function is to convert external electromagnetic wave materials into heat energy, reduce the intensity of reflected waves, and achieve the effect of stealth. Electromagnetic absorbing materials have attracted widespread attention due to their wide application in the fields of radar, aerospace, microwave communication, electronic countermeasures, and electronically compatible absorption and shielding. [0003] Nickel oxide is a typical metal oxide, which has potential application value in supercapacitors, lithium-ion batteries, catalysts, etc. [0004] Carbon-based composite materials have very superior microwave absorption properties and they can also meet other advant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
Inventor 雒海龙张惠胡杰沈玉华谢安建王翠平
Owner 北京军通新材科技有限公司
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