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Magnetic reduction graphene oxide nano composite material and preparation method and application thereof

A nanocomposite material and graphene technology, which is applied in the field of magnetically reduced graphene oxide nanocomposite materials and its preparation, can solve the problems of poor microwave absorption performance, cumbersome preparation process, and many reaction reagents, so as to improve microwave absorption performance, The process is simple and the effect of improving the effective absorption bandwidth

Inactive Publication Date: 2019-06-18
BEIJING INST OF ENVIRONMENTAL FEATURES
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Chinese patent application CN201310597295.0 discloses a ferrite hollow sphere-graphene composite wave-absorbing material and its preparation method, but the preparation method also requires the gas phase diffusion reaction of the obtained mixed solution and the precursor The ferrite hollow sphere-graphene composite material can only be obtained by calcining the body under an inert atmosphere. There are problems such as cumbersome preparation process, many reaction reagents and many equipment involved; in addition, the ferrite hollow sphere in the patent application- The effective bandwidth of the graphene composite absorbing material is narrow and the maximum reflectance loss can only reach about -35.5dB, and the absorbing performance is not good.

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  • Magnetic reduction graphene oxide nano composite material and preparation method and application thereof
  • Magnetic reduction graphene oxide nano composite material and preparation method and application thereof
  • Magnetic reduction graphene oxide nano composite material and preparation method and application thereof

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preparation example Construction

[0036] The present invention provides a kind of preparation method of magnetically reduced graphene oxide nanocomposite material in second aspect, described method comprises the steps:

[0037] (1) graphene oxide is uniformly dispersed with deionized water to obtain a graphene oxide dispersion;

[0038] (2) adding divalent nickel salt and ferric salt to the graphene oxide dispersion obtained in step (1) and stirring evenly to obtain the first mixed solution;

[0039] (3) adding ammonia water to the first mixed solution obtained in step (2) to adjust the first mixed solution to alkaline to obtain a second mixed solution;

[0040] (4) carry out hydrothermal treatment to the described second mixed solution that step (3) obtains, make magnetic reduction graphene oxide nanocomposite material (NiFe 2 o 4 / r-GO nanocomposites).

[0041] It should be noted that the terms "first", "second" and so on are only used for descriptive purposes, and should not be understood as indicating o...

Embodiment 1

[0063] S1. Disperse graphene oxide with a content of 20mg in 30mL deionized water, and perform ultrasonic treatment for 2h; centrifuge the dispersed graphene oxide mixture after ultrasonic treatment, the speed is 3000r / min, and the centrifugation time is 3min. Take the supernatant to obtain a uniformly dispersed graphene oxide dispersion.

[0064] S2. Add 0.122g of ferric nitrate nonahydrate and 0.0435g of nickel nitrate hexahydrate to the above-mentioned uniformly dispersed graphene oxide dispersion, and stir fully at room temperature on a magnetic stirrer for 30 minutes until completely dissolved , to obtain the first mixture.

[0065] S3. Add ammonia water dropwise to the first mixed solution obtained in S2, stir well to make it evenly mixed, adjust the pH value of the first mixed solution to 10, and obtain a second mixed solution.

[0066] S4. Transfer the uniform second mixed solution obtained in S3 to a 50 mL polytetrafluoroethylene-lined reactor for hydrothermal treatm...

Embodiment 2

[0070] S1. Disperse graphene oxide with a content of 20mg in 30mL deionized water, and perform ultrasonic treatment for 2h; centrifuge the dispersed graphene oxide mixture after ultrasonic treatment, the speed is 3000r / min, and the centrifugation time is 3min. Take the supernatant to obtain a uniformly dispersed graphene oxide dispersion.

[0071] S2. Add 0.624g of ferric nitrate nonahydrate and 0.223g of nickel nitrate hexahydrate to the above-mentioned uniformly dispersed graphene oxide dispersion, and stir fully at room temperature on a magnetic stirrer for 30 minutes until completely dissolved , to obtain the first mixture.

[0072] S3. Add ammonia water dropwise to the first mixed solution obtained in S2, stir well to make it evenly mixed, adjust the pH value of the first mixed solution to 10, and obtain a second mixed solution.

[0073] S4. Transfer the uniform second mixed solution obtained in S3 to a 50 mL polytetrafluoroethylene-lined reactor for hydrothermal treatme...

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Abstract

The invention relates to a magnetic reduction graphene oxide nano composite material and a preparation method and application thereof. The nano composite material comprises reduced graphene oxide andmagnetic nickel ferrite nanocrystalline with the average particle diameter of 6-12 nm uniformly deposited on the surface of the reduced graphene oxide. The method comprises the following steps: uniformly dispersing graphene oxide with deionized water to obtain graphene oxide dispersion liquid; adding divalent nickel salt and trivalent iron salt into the graphene oxide dispersion liquid, and uniformly stirring to obtain a first mixed solution; adding ammonia water into the first mixed solution to adjust the first mixed solution to be alkaline to obtain a second mixed solution; and carrying outhydrothermal treatment on the second mixed solution to obtain the nano composite material. The nano composite material has strong absorption strength, wide absorption bandwidth and double-band microwave absorption performance. The process is simple and convenient, the agglomeration problem of reduced graphene oxide and magnetic small-size nanocrystals can be avoided, and the microwave absorption performance and the effective absorption bandwidth of the composite material are improved.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite material preparation, and in particular relates to a magnetically reduced graphene oxide nanocomposite material and its preparation method and application. Background technique [0002] With the rapid development of electronic equipment and digital systems, electromagnetic interference has gradually evolved into a serious pollution problem. In particular, electromagnetic radiation can cause gene mutations through thermal effects and cumulative effects, destroying the immune and metabolic systems of organisms, and seriously threatening human health. In addition, electromagnetic interference shielding and microwave absorption are also important research contents of military cutting-edge technology. Therefore, we urgently need to find a functional material that can effectively attenuate electromagnetic waves. Microwave absorbing materials, which can convert electromagnetic waves into heat ene...

Claims

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Application Information

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IPC IPC(8): C01B32/184C01G53/00H05K9/00
Inventor 贺军哲孙新杨智慧田江晓张久霖于海涛
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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