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CoFe@ C/rGO electromagnetic wave absorption composite material and preparation method thereof

A technology for absorbing composite materials and composite materials, which is applied in the field of CoFe@C/rGO electromagnetic wave absorbing composite materials and its preparation, can solve the problems of sheet aggregation, single attenuation loss mechanism, poor impedance matching characteristics, etc. Dielectric loss capability and the effect of improving conductivity

Active Publication Date: 2022-02-11
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when graphene is used as a wave-absorbing material, there are problems such as poor impedance matching characteristics, single attenuation loss mechanism, and aggregation of sheets.

Method used

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  • CoFe@ C/rGO electromagnetic wave absorption composite material and preparation method thereof
  • CoFe@ C/rGO electromagnetic wave absorption composite material and preparation method thereof
  • CoFe@ C/rGO electromagnetic wave absorption composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Preparation of CoFe@C composite material

[0030] (1) Add 0.294g of sodium citrate dihydrate and 0.3g of cobalt acetate tetrahydrate into 80mL of deionized water, ultrasonically treat for 2 hours, and dissolve completely to obtain solution A. Add 0.264g of potassium ferricyanide into 120mL of deionized water, completely Dissolving to obtain solution B;

[0031] (2) Magnetically stir solution A, then pour solution B into solution E within 1 minute, and continue stirring for 10 minutes to obtain solution C, then put solution C in a water bath at 90°C for 8 hours, and then centrifuge and wash for final Obtain CoFe Prussian blue analogue;

[0032] (3) The CoFe Prussian blue analogue was annealed at 600°C under an argon atmosphere, the annealing time was 2h, and the annealing rate was 2°C / min to obtain 0.18g of CoFe@C composite material.

Embodiment 2

[0033] Example 2: Preparation of CoFe@C / rGO-1 composite material

[0034] (1) Add 0.035g of graphene oxide (GO) into 80mL of deionized water, and ultrasonically treat it for 1h to completely dissolve it in deionized water to obtain solution A;

[0035] (2) Add 0.294 g of sodium citrate dihydrate and 0.3 g of cobalt acetate tetrahydrate into solution A, completely dissolve to obtain solution B, add 0.264 g of potassium ferricyanide into 120 mL of deionized water, and completely dissolve to obtain solution C;

[0036] (3) Magnetically stir solution B, then pour solution C into solution B within 1 min, and continue to stir for 10 min to obtain solution D, then put solution D in a water bath at 90°C for 8 h, and finally undergo centrifugal washing treatment. Obtain CoFe Prussian blue analogue / GO composite material;

[0037] (4) The CoFe Prussian blue analogue / GO composite material was annealed at 600 °C under an argon atmosphere for 2 h, and the annealing rate was 2 °C / min to obt...

Embodiment 3

[0038] Example 3: Preparation of CoFe@C / rGO-2 composite material

[0039] (1) Add 0.05g of graphene oxide (GO) into 80mL of deionized water, and ultrasonically treat it for 0.5h to completely dissolve it in deionized water to obtain solution A;

[0040] (2) Add 0.294 g of sodium citrate dihydrate and 0.3 g of cobalt acetate tetrahydrate into solution A, completely dissolve to obtain solution B, add 0.264 g of potassium ferricyanide into 120 mL of deionized water, and completely dissolve to obtain solution C;

[0041] (3) Magnetically stir solution B, then pour solution C into solution B within 20 seconds, and continue to stir for 5 minutes to obtain solution D, then put solution D in a water bath at 80°C for 6 hours, and finally undergo centrifugal washing treatment. Obtain CoFe Prussian blue analogue / GO composite material;

[0042] (4) The CoFe Prussian blue analogue / GO composite material was annealed at 600 °C under an argon atmosphere for 2 h, and the annealing rate was 2 ...

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Abstract

The invention belongs to the technical field of electromagnetic wave absorption, and particularly relates to a CoFe@ C / rGO electromagnetic wave absorption composite material and a preparation method thereof. According to the CoFe@ C / rGO composite material and the preparation method thereof, the CoFe@C / rGO composite material with the CoFe Prussian blue analogue as the precursor is prepared by adopting an in-situ growth and pyrolysis method; the electromagnetic wave absorption performance of the CoFe@ C / rGO composite material is improved by adding rGO; and the dielectric loss, the conductive loss and the attenuation capability are also obviously improved. According to the method, the dielectric constant is adjusted by changing the content of GO, and the requirements that the dielectric constant and the magnetic conductivity of the electromagnetic wave absorption composite material are adjustable and the impedance matching performance is improved are met. The preparation method provided by the invention is simple, environment-friendly and suitable for large-scale preparation, the CoFe@ C / rGO electromagnetic wave absorption composite material with excellent electromagnetic wave absorption performance can be obtained only by using less graphene oxide, the minimum reflection loss can reach -53.0 dB when the matching thickness is 2.4 mm, and the CoFe@ C / rGO electromagnetic wave absorption composite material has a wide application prospect in the field of electromagnetic wave absorption.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave absorption, in particular to a CoFe@C / rGO electromagnetic wave absorption composite material derived from a CoFe Prussian blue analog and a preparation method thereof. Background technique [0002] With the rapid development of electronic equipment and communication technology, electromagnetic wave radiation and interference have become a serious environmental problem, which not only destroys the normal use of electronic equipment, but also endangers people's health. In order to solve this serious problem, it is an effective measure to study high-performance electromagnetic wave absorbing materials with strong absorption, low density, wide bandwidth, and thin thickness. In recent years, various electromagnetic wave absorbing materials, such as carbon materials, metals and their oxides, magnetic ferrites, conductive polymers, etc., have been extensively studied. However, due to the li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00C01B32/15C01B32/19H05K9/00
CPCC09K3/00C01B32/15C01B32/19H05K9/0081
Inventor 陈守刚魏双史志成高慧
Owner OCEAN UNIV OF CHINA
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