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Preparation method of reduced graphene oxide/multi-walled carbon nanotube/nickel ferrite three-element nano composite wave-absorbing material

A technology of multi-walled carbon nanotubes and composite wave-absorbing materials, applied in chemical instruments and methods, electrical components, and other chemical processes, can solve problems such as poor impedance matching, poor electromagnetic wave absorption strength, and affecting the performance of RGO, achieving Enhanced electrical conductivity, easy operation, and easy-to-adjust microwave-absorbing properties

Active Publication Date: 2018-10-23
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are π-π interactions between RGO sheets, which are easy to agglomerate to form aggregates, which affects the practical performance of RGO.
In addition, when pure RGO is used as an electromagnetic wave absorbing material, due to poor impedance matching and a single electromagnetic wave attenuation mechanism, its electromagnetic wave absorption strength is poor, which cannot meet the requirements of practical applications.

Method used

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  • Preparation method of reduced graphene oxide/multi-walled carbon nanotube/nickel ferrite three-element nano composite wave-absorbing material
  • Preparation method of reduced graphene oxide/multi-walled carbon nanotube/nickel ferrite three-element nano composite wave-absorbing material
  • Preparation method of reduced graphene oxide/multi-walled carbon nanotube/nickel ferrite three-element nano composite wave-absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Take a 100mL beaker, add 60mL deionized water and 36mg graphite oxide, sonicate for 30min, and stir vigorously for 2h to obtain a GO aqueous dispersion with a concentration of 0.60mg / mL.

[0031] 2. Add 8mmol (3.2320g) iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) and 4mmol (1.1632g) nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O), vigorously stirred for 30min and sonicated for 30min.

[0032] 3. Add ammonia water drop by drop to adjust the pH of the mixed dispersion to 11.

[0033] 4. Pour the mixed dispersion liquid into a 100mL reactor, and conduct a hydrothermal reaction at 180°C for 24 hours.

[0034] 5. After the reaction, cool to room temperature, collect the solid product by magnetic separation, wash with deionized water until neutral, and then wash with absolute ethanol three times.

[0035] 6. Put it into a vacuum drying oven, dry at 60°C for 24 hours, and grind to obtain the final product, which is designated as S1.

[0036] The XRD spectrogram of...

Embodiment 2

[0038] 1. Take a 100mL beaker, add 60mL deionized water and 36mg graphite oxide, sonicate for 30min, stir vigorously for 2h to obtain a GO aqueous dispersion with a concentration of 0.60mg / mL, then add 10mg of MWCNTs, and sonicate for 30min.

[0039] 2. Add 8mmol (3.2320g) iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) and 4mmol (1.1632g) nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O), vigorously stirred for 30min and sonicated for 30min.

[0040] 3. Add ammonia water drop by drop to adjust the pH of the mixed dispersion to 11.

[0041] 4. Pour the mixed dispersion liquid into a 100mL reactor, and conduct a hydrothermal reaction at 180°C for 24 hours.

[0042] 5. After the reaction, cool to room temperature, collect the solid product by magnetic separation, wash with deionized water until neutral, and then wash with absolute ethanol three times.

[0043] 6. Put it into a vacuum drying oven, dry at 60°C for 24 hours, and grind to obtain the final product, which is desig...

Embodiment 3

[0046] 1. Take a 100mL beaker, add 60mL deionized water and 36mg graphite oxide, sonicate for 30min, stir vigorously for 2h to obtain a GO aqueous dispersion with a concentration of 0.60mg / mL, then add 20mg of MWCNTs, and sonicate for 30min.

[0047] 2. Add 8mmol (3.2320g) iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) and 4mmol (1.1632g) nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O), vigorously stirred for 30min and sonicated for 30min.

[0048] 3. Add ammonia water drop by drop to adjust the pH of the mixed dispersion to 11.

[0049] 4. Pour the mixed dispersion liquid into a 100mL reactor, and conduct a hydrothermal reaction at 180°C for 24 hours.

[0050] 5. After the reaction, cool to room temperature, collect the solid product by magnetic separation, wash with deionized water until neutral, and then wash with absolute ethanol three times.

[0051] 6. Put it into a vacuum drying oven, dry at 60°C for 24 hours, and grind to obtain the final product, which is desig...

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Abstract

The invention discloses a reduced graphene oxide / multi-walled carbon nanotube / nickel ferrite (RGO / MWCNTs / NiFe2O4) three-element nano composite wave-absorbing material and a preparation method thereof.The RGO / MWCNTs / NiFe2O4 three-element nano composite material with a local three-dimensional conducting network structure is prepared by adopting graphene oxide (GO), the multi-walled carbon nanotube,nickel nitrate hexahydrate and iron nitrate nonahydrate as precursors and carrying out one-step hydrothermal reaction. The preparation method is pollution-free and environmentally friendly, has no production of any toxic and harmful side products, and is simple in preparation process and low in cost; the prepared three-element nano composite wave-absorbing material is strong in capability of absorbing electromagnetic waves, wide in absorbing frequency band, small in thickness and low in density, can realize effective absorption of the electromagnetic waves with different wavebands by adjusting the content of MWCNTs in the composite material and the thickness of a coating layer, and has an important application value in the fields of electromagnetic absorption and electromagnetic shielding.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic composite materials, and in particular relates to a preparation method of a reduced graphene oxide-based magnetic nanocomposite wave-absorbing material. Background technique [0002] With the development of electromagnetic stealth technology in the military field and the increasingly serious problems of electromagnetic interference and electromagnetic pollution, electromagnetic wave absorbing materials have gradually become a research hotspot in the field of functional materials. Traditional electromagnetic wave absorbing materials, such as ferrite, metal micropowder and silicon carbide, usually have the disadvantages of narrow absorption frequency band and high density, which limits their practical application. New electromagnetic wave absorbing materials generally need to meet the requirements of thin thickness, light weight, wide absorption frequency band, and strong absorption performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00H05K9/00
CPCC09K3/00H05K9/0081
Inventor 疏瑞文吴越张佳宾李为杰李振银郭长莲孙瑞瑞
Owner ANHUI UNIV OF SCI & TECH
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