Nitrogen-doped graphene nickel ferrite composite wave-absorbing material and preparation method thereof

A composite wave absorbing material, nitrogen doping technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of poor impedance matching of RGO, low electromagnetic wave absorption ability, difficult to meet commercial applications, etc., and achieves low matching thickness, Excellent absorbing performance and strong absorption effect

Active Publication Date: 2021-02-19
安徽理工大学环境友好材料与职业健康研究院(芜湖)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a single RGO has disadvantages such as poor impedance matching and low electromagnetic wave absorption ability. The application of RGO materials in the field of electromagnetic wave absorption is limited, and it is difficult to meet the needs of commercial applications (reflection loss value is lower than -10dB).

Method used

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  • Nitrogen-doped graphene nickel ferrite composite wave-absorbing material and preparation method thereof
  • Nitrogen-doped graphene nickel ferrite composite wave-absorbing material and preparation method thereof
  • Nitrogen-doped graphene nickel ferrite composite wave-absorbing material and preparation method thereof

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Embodiment 1

[0048] The method steps for the preparation of the nitrogen-doped graphene-nickel-ferrite composite wave-absorbing material proposed by the present invention are as follows:

[0049] S1: Add 120 mL of deionized water and 90 mg of graphene oxide into the container, stir for 10 minutes and then sonicate for 30 minutes to prepare a graphene oxide aqueous dispersion with a concentration of 0.75 mg / mL;

[0050] S2: Add 1.616g (4mmol) iron nitrate nonahydrate (Fe(NO) to the dispersion described in S1 3 ) 3 9H 2 O) and 0.582g (2mmol) nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 0), stirring 10min makes it dissolve completely, obtains uniform transparent dispersion liquid, then adds 2.7g sodium acetate, stirs 15min to fully dissolving;

[0051] S3: Add 0.75 g of polyethylene glycol to the solution of S2, stir in a water bath at 50°C to dissolve it;

[0052] S4: Add 5 mL of hydrazine hydrate to the solution of S3, and stir for 10 minutes to obtain a uniform dispersion. After mix...

Embodiment 2

[0056] The method steps for the preparation of the nitrogen-doped graphene-nickel-ferrite composite wave-absorbing material proposed by the present invention are as follows:

[0057] S1: Add 120 mL of deionized water and 90 mg of graphene oxide into the container, stir for 10 minutes and then sonicate for 30 minutes to prepare a graphene oxide aqueous dispersion with a concentration of 0.75 mg / mL;

[0058] S2: Add 1.616g (4mmol) iron nitrate nonahydrate (Fe(NO) to the dispersion described in S1 3 ) 3 9H 2 O) and 0.582g (2mmol) nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 0), stirring 10min makes it dissolve completely, obtains uniform transparent dispersion liquid, then adds 2.7g sodium acetate, stirs 15min to fully dissolving;

[0059] S3: Add 0.75 g of polyethylene glycol to the solution of S2, stir in a water bath at 50°C to dissolve it;

[0060] S4: Add 10 mL of hydrazine hydrate to the solution of S3, and stir for 10 minutes to obtain a uniform dispersion. After mi...

Embodiment 3

[0064] The method steps for the preparation of the nitrogen-doped graphene-nickel-ferrite composite wave-absorbing material proposed by the present invention are as follows:

[0065] S1: Add 120 mL of deionized water and 90 mg of graphene oxide into the container, stir for 10 minutes and then sonicate for 30 minutes to prepare a graphene oxide aqueous dispersion with a concentration of 0.75 mg / mL;

[0066] S2: Add 1.616g (4mmol) iron nitrate nonahydrate (Fe(NO) to the dispersion described in S1 3 ) 3 9H 2 O) and 0.582g (2mmol) nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 0), stirring 10min makes it dissolve completely, obtains uniform transparent dispersion liquid, then adds 2.7g sodium acetate, stirs 15min to fully dissolving;

[0067] S3: Add 0.75 g of polyethylene glycol to the solution of S2, stir in a water bath at 50°C to dissolve it;

[0068] S4: Add 15 mL of hydrazine hydrate to the solution of S3, and stir for 10 minutes to obtain a uniform dispersion. After mi...

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Abstract

The invention discloses a nitrogen-doped graphene nickel ferrite composite wave-absorbing material and a preparation method thereof. A nitrogen-doped reduced graphene oxide / hexagonal nickel ferrite nano composite material is prepared by taking graphene oxide (GO) as a template, taking ferric nitrate nonahydrate and nickel nitrate hexahydrate as precursors and taking hydrazine hydrate as a nitrogen-doped reagent through a simple one-step hydrothermal method. The nano composite material prepared by the invention is formed by entangling a large number of hexagonal nickel ferrite particles in nanosize by two-dimensional folded graphene, has strong electromagnetic wave absorption capability, wide absorption frequency band and small matching thickness, and can generate double absorption peaks at low frequency (3-6GHz) and high frequency (12-18GHz); and the nitrogen doping amount of graphene in the composite material can be changed by controlling the adding volume of hydrazine hydrate, meanwhile, effective attenuation of the composite material to electromagnetic waves under different wave bands can be achieved by changing the matching thickness, and the composite material has important application value in the fields of electromagnetic wave absorption and electromagnetic shielding.

Description

technical field [0001] The invention relates to the technical field of electromagnetic composite materials, in particular to a nitrogen-doped graphene-nickel-ferrite composite wave-absorbing material and a preparation method thereof. Background technique [0002] Due to the excessive use of electronic equipment, serious problems such as electromagnetic radiation pollution and electromagnetic interference have been caused, making electromagnetic wave absorbing materials gradually become a research hotspot in the field of functional materials. Electromagnetic wave absorbing material (referred to as wave absorbing material) refers to a class of materials that can absorb and attenuate incident electromagnetic waves, convert electromagnetic energy into heat or other forms of energy and dissipate it, or make electromagnetic waves disappear due to interference. Traditional absorbing materials, such as ferrite, metal micropowder and silicon carbide, usually have the disadvantages of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 疏瑞文张佳宾唐小龙聂丽娟朱方义
Owner 安徽理工大学环境友好材料与职业健康研究院(芜湖)
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