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BiFeO3/RGO composite wave-absorbing material and preparation method thereof

A technology of composite absorbing materials and composite materials, applied in the field of BFO/RGO composite materials, to achieve the effects of impedance matching and electromagnetic wave attenuation characteristics, strong absorption capacity, and high conductivity

Active Publication Date: 2020-05-19
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single bismuth ferrite material still has certain deficiencies in the electromagnetic wave absorption strength and the width of the absorption frequency band.

Method used

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  • BiFeO3/RGO composite wave-absorbing material and preparation method thereof
  • BiFeO3/RGO composite wave-absorbing material and preparation method thereof
  • BiFeO3/RGO composite wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Preparation of bismuth ferrite sample

[0027] Preparation of bismuth ferrite powder by hydrothermal method: 1.02 g of ferric nitrate nonahydrate and bismuth nitrate pentahydrate with a corresponding molar ratio of 1:1 were mechanically stirred in 60 mL of deionized water for 30 min, and then transferred to a 100 mL poly The reaction was carried out in a tetrafluoroethylene-lined hydrothermal kettle at 160 °C for 8 h. After the reaction was completed and cooled to room temperature, it was washed three times with deionized water and ethanol respectively, and dried in an oven at 45 °C for 6 h to obtain bismuth ferrite powder.

Embodiment 2

[0028] Example 2 Preparation of graphene oxide samples

[0029] The preparation process is as figure 1 , Weighed 3 g of natural flake graphite and 1.5 g of sodium nitrate in 50 mL of concentrated sulfuric acid solution, and transferred to a three-necked flask, stirred for 0.5 h in an ice bath, and then added 10 g of KMnO 4 Stirring was continued for 2 h, and after the suspension was observed to change from purple to dark green, the temperature was raised to 35°C for 2 h of medium-temperature reaction. Subsequently, the reaction system was fixed in a water bath with a constant temperature of 90 °C. After 2 h of high temperature reaction, 120 mL of deionized water and 10 mL (30%) of hydrogen peroxide solution were added to terminate the reaction and ultrasonic Peel for 1 h. After filtration and washing for 3 times, graphene oxide nanosheets were obtained after drying in an oven at 50 °C for 24 h, and kept for future use.

Embodiment 3

[0030] The preparation of embodiment 3 BFO / RGO composite material

[0031] The preparation process is as figure 2 , add 0.9 g of bismuth ferrite powder and 20 mg of cetyltrimethylammonium bromide into 100 mL of graphene oxide aqueous solution with a concentration of 1 mg / mL, stir and sonicate for 1 h to obtain a yellow-brown stable suspension liquid; then transferred to a 100 mL hydrothermal kettle for reaction at a temperature of 180 °C for 12 h. After cooling to room temperature, the obtained product was washed and filtered three times with deionized water and ethanol, respectively, and dried at 45 °C for 6 h to obtain the BFO / RGO composite material.

[0032] Embodiment 4 and 5 are all prepared by the same preparation method as Embodiment 3. Its composition, dosage and process conditions are shown in Table 1:

[0033] Table 1 Summary of composition, dosage and process conditions of samples 3, 4, and 5 of the example

[0034] raw material Example 3 Example ...

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Abstract

The invention discloses a BiFeO3 / RGO composite wave-absorbing material and a preparation method thereof. The preparation method comprises the following steps: adding bismuth ferrite powder and hexadecyl trimethyl ammonium bromide into a graphene oxide aqueous solution together, stirring and ultrasonically dispersing uniformly, carrying out hydrothermal reaction on an obtained suspension, cooling to room temperature, washing and drying to obtain the reduced graphene oxide loaded bismuth ferrite particle composite material. The reduced graphene oxide loaded bismuth ferrite particle composite material has impedance matching and electromagnetic wave attenuation characteristics, is a good dielectric loss type stealth wave-absorbing material and has a good application prospect in the field of wave absorption.

Description

technical field [0001] The invention relates to a BFO / RGO composite material applicable to centimeter-wave absorption and millimeter-wave attenuation, and belongs to the technical field of stealth wave-absorbing materials. Background technique [0002] The development of science and technology has greatly changed people's lives. In recent years, electromagnetic waves have been widely used in many fields such as military affairs, medicine, and household appliances. However, electromagnetic pollution has become the fourth largest pollution after water pollution, air pollution and noise pollution, which has greatly damaged human health. At the same time, the rapid development of radar detection technology has led many countries to invest a lot of money and energy in the research of anti-detection technology, which has been applied in the military battlefield. As a novel and efficient means of defense and interference, microwave-absorbing materials perform well in both civil an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00C01B32/198C01G49/00
CPCC09K3/00C01G49/00C01B32/198C01P2004/03C01P2002/72
Inventor 叶明泉廖俊
Owner NANJING UNIV OF SCI & TECH
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