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Preparation method of reduced graphene oxide/nickel oxide composite wave absorbing material

A composite wave-absorbing material, graphene technology, applied in chemical instruments and methods, other chemical processes, etc., to achieve light weight, improve reflection loss, and achieve the effect of impedance matching

Inactive Publication Date: 2014-08-27
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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  • Preparation method of reduced graphene oxide/nickel oxide composite wave absorbing material
  • Preparation method of reduced graphene oxide/nickel oxide composite wave absorbing material
  • Preparation method of reduced graphene oxide/nickel oxide composite wave absorbing material

Examples

Experimental program
Comparison scheme
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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] The specific preparation method is: take by weighing 3g of graphite, mix with 1.5g of sodium nitrate, measure 150mL of sulfuric acid and slowly add in the above solid, ice bath and slowly add 9.0g of potassium permanganate under magnetic stirring, this process Continue for about 2 hours; remove the ice bath, bathe in water at 35°C 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; the above solution Centrifuge and wash with water for several times, take the lower layer and sonicate for 2 hours, then centrifuge at 8000 rpm to get the upper layer, dialyze for 15 days, and freeze-dry.

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

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

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 100 mg of graphene oxide, ultrasonically disperse it in 50 mL of water, and prepare a 2 mg / 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, it was kept for 2 h, and then the temperature was lowered at a rate of 5 °C / min. After cooling down to room temper...

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 100 mg of graphene oxide, ultrasonically disperse it in 50 mL of water, and prepare a 2 mg / 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, it was kept for 2 h, and then the temperature was lowered at a rate of 3 °C / min. After cooling down to room temp...

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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 ad...

Claims

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Application Information

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Patent Type & Authority Applications(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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