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Ferroferric oxide/reduced graphene oxide composite wave-absorbing material with hollow hemisphere structure and preparation method

A technology of composite microwave-absorbing materials and ferroferric oxide, which is applied in chemical instruments and methods, and other chemical processes, can solve the problems of microwave absorption performance and electromagnetic shielding performance reporting of composite materials, so as to improve the stealth effect and change the electromagnetic parameters , Improve the effect of absorbing performance

Active Publication Date: 2012-07-04
EARTH PANDA SUZHOU MAGNET +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are many reports on the composite material of ferric oxide and reduced graphene oxide, but most of them study the supercapacitor performance and lithium battery performance of the composite material. For the composite material Microwave absorption performance and electromagnetic shielding performance are relatively few reports, and most of the current reports are solid nanoparticles of Fe3O4 / reduced graphene oxide composites, such as in G. Zhou, et al, Graphene-wrapped Fe3O4 anode material with improved reversible capacity and cyclic stability for lithium ion batteries. Chem. Mater. 2010, 22, 5306-5313. and Shantanu K. Behera, Enhanced rate performance and cyclic stability of Fe3O4-graphene nanocomposites for Li ion battery anodes, Chem. Commun., 2011, 47, 10371–10373.

Method used

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  • Ferroferric oxide/reduced graphene oxide composite wave-absorbing material with hollow hemisphere structure and preparation method
  • Ferroferric oxide/reduced graphene oxide composite wave-absorbing material with hollow hemisphere structure and preparation method
  • Ferroferric oxide/reduced graphene oxide composite wave-absorbing material with hollow hemisphere structure and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Weigh 0.01 g of graphene oxide and 0.5 g of P123, put them in a 100 ml beaker, add 60 ml of ethylene glycol, and ultrasonically disperse for 90 minutes;

[0031] 2. Weigh 1.0 g of ferric chloride and 2.0 g of sodium acetate, add to the above solution in turn, and stir rapidly for 60 minutes;

[0032] 3. Transfer the above mixture solution into a 100 ml stainless steel reaction kettle, tighten it, and put it in a blast drying oven at a constant temperature of 180 degrees Celsius for 10 hours;

[0033] 4. Take out the reaction kettle, filter the product with suction, wash with distilled water and absolute ethanol in turn, and then put it in a vacuum drying oven at 80 degrees Celsius for 10 hours in vacuum to obtain a hollow hemispherical ferric oxide / reduced graphene oxide composite Absorbing material.

[0034]

Embodiment 2

[0036] 1. Weigh 0.05 g of graphene oxide and 0.5 g of P123, put them in a 100 ml beaker, add 60 ml of ethylene glycol, and ultrasonically disperse for 90 minutes;

[0037] 2. Weigh 1.0 g of ferric chloride and 2.0 g of sodium acetate, add to the above solution in turn, and stir rapidly for 60 minutes;

[0038] 3. Transfer the above mixture solution into a 100 ml stainless steel reaction kettle, tighten it, and put it in a blast drying oven at a constant temperature of 180 degrees Celsius for 10 hours;

[0039] 4. Take out the reaction kettle, filter the product with suction, wash with distilled water and absolute ethanol in turn, and then put it in a vacuum drying oven at 80 degrees Celsius for 10 hours in vacuum to obtain a hollow hemispherical ferric oxide / reduced graphene oxide composite Absorbing material.

[0040]

Embodiment 3

[0042] 1. Weigh 0.1 g of graphene oxide and 0.5 g of P123, put them in a 100 ml beaker, add 60 ml of ethylene glycol, and ultrasonically disperse for 90 minutes;

[0043] 2. Weigh 1.0 g of ferric chloride and 2.0 g of sodium acetate, add to the above solution in turn, and stir rapidly for 60 minutes;

[0044] 3. Transfer the above mixture solution into a 100 ml stainless steel reaction kettle, tighten it, and put it in a blast drying oven at a constant temperature of 180 degrees Celsius for 10 hours;

[0045]4. Take out the reaction kettle, filter the product with suction, wash with distilled water and absolute ethanol in turn, and then put it in a vacuum drying oven at 80 degrees Celsius for 10 hours in vacuum to obtain a hollow hemispherical ferric oxide / reduced graphene oxide composite Absorbing material.

[0046]

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Abstract

The invention discloses a ferroferric oxide / reduced graphene oxide composite wave-absorbing material with a hollow hemisphere structure, which is characterized in that ferroferric oxide nanoparticles with the hollow hemisphere structure are uniformly grown on the upper and lower surfaces of the reduced graphene oxide sheet to form a wave-absorbing material with a multi-layer composite structure and a nanosized thickness. The thickness of the composite wave-absorbing material is less than the range of 100 -1,000nm, which is the skin depth of ferromagnetic materials in a microwave frequency band. The invention also discloses a preparation method of the composite wave-absorbing material. The composite wave-absorbing material improves the content of ferroferric oxide in a composite material, has a thickness less than the skin depth of ferromagnetic materials in microwave frequency band, namely, 100-1,000nm, and effectively inhibits the skin dissipation of composite materials. The composite wave-absorbing material has light weight and good wave-absorbing property in actual utilization, not only can effectively absorb electromagnetic wave, but also can deflect and scatter radar waves, greatly improves the stealth effect in actual utilization, and completely meets requirements of a new wave-absorbing material of being thin, light, wide, and strong.

Description

[0001] technical field [0002] The invention relates to a wave-absorbing material with a novel structure and a preparation method thereof, in particular to a method for preparing a hollow hemispherical ferric oxide / reduced graphene oxide composite wave-absorbing material. [0003] Background technique [0004] Ferrite is a traditional wave-absorbing material. Due to its low price and double complex loss to electromagnetic waves, ferrite absorbers have the characteristics of strong absorption, wide frequency band, strong corrosion resistance and low cost. The bulk density is high, and it is difficult to meet the principle that the relative permittivity and relative permeability are as close as possible, which makes the impedance matching difficult, so that it is difficult for a single ferrite to satisfy strong absorption, wide frequency band, light weight and thin thickness at the same time. and other high-performance absorbing materials. Reduced graphene oxide is a new ty...

Claims

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Application Information

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IPC IPC(8): C09K3/00
Inventor 毕红徐怀良孙俊袁媛
Owner EARTH PANDA SUZHOU MAGNET
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