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Graphene/ferroferric oxide composite material and preparation method and application thereof

A technology of ferroferric oxide and composite materials, applied in the field of materials, can solve problems such as poor terahertz absorption performance, poor dispersion uniformity, and high absorber density

Inactive Publication Date: 2020-01-10
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene-based absorbing components in most absorbers exist in the form of fillers, which are prone to problems such as poor dispersion uniformity and high absorber density.
And it is very easy to produce the problems of high refractive index in the terahertz frequency band, strong surface reflection, and poor terahertz absorption performance.
Therefore, most of the graphene-based absorbing materials reported so far are mainly concentrated in the centimeter wave band and have a narrow absorption frequency band and low absorption strength. It is difficult to cope with the increasingly complex and changeable electromagnetic environment in life and the joint detection of radars using different wave band electromagnetic wave technologies.

Method used

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  • Graphene/ferroferric oxide composite material and preparation method and application thereof
  • Graphene/ferroferric oxide composite material and preparation method and application thereof
  • Graphene/ferroferric oxide composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0139] 1) Weigh graphene oxide and iron triacetylacetonate powder in a container filled with ethanol according to the mass ratio of 1:1, and vigorously sonicate and stir to form a stable colloidal solution. Keep the concentration of graphene oxide in the mixed solution at 1.0mg / ml.

[0140] 2) Transfer the colloidal solution obtained above to a polytetrafluoroethylene lining, put the lining into a stainless steel reactor, and keep it warm at 200°C for 18 hours. After the reactor naturally cools down to room temperature, take out the graphite filled with ethanol ene / iron tetroxide gel-like material, and completely replace it with water system.

[0141] The step of replacing the ethanol in the graphene / ferric oxide gel-like material full of ethanol with water is: the gel-like material is successively placed in a series of mixed solutions of ethanol and water and finally placed in pure In water, wherein the ratio of water in the series of mixed solutions increases successively a...

Embodiment 2

[0149] 1) Weigh graphene oxide and iron triacetylacetonate powder in a container filled with ethanol according to the mass ratio of 1.5:1, and vigorously sonicate and stir to form a stable colloidal solution. Keep the concentration of graphene oxide in the mixed solution at 2.0mg / ml.

[0150] 2) Transfer the colloidal solution obtained above to a polytetrafluoroethylene lining, put the lining into a stainless steel reactor, keep it warm at 180°C for 12 hours, and take out the ethanol-filled graphite after the reactor naturally cools down to room temperature ene / iron tetroxide gel-like material, and completely replace it with water system.

[0151] 3) The above water system was gradually frozen to a solid state at -70°C.

[0152] 4) Freeze-dry the obtained solid composite of graphene / ferric oxide and ice at -20° C. for 120 h. Then the graphene / ferric oxide composite material is obtained.

[0153] 5) In an inert gas of argon, heat-treat the obtained above-mentioned graphene / i...

Embodiment 3

[0156] 1) Weigh graphene oxide and iron triacetylacetonate powder in a container filled with ethanol according to the mass ratio of 2:1, and vigorously sonicate and stir to form a stable colloidal solution. Keep the concentration of graphene oxide in the mixed solution at 0.75mg / ml.

[0157] 2) Transfer the colloidal solution obtained above to a polytetrafluoroethylene lining, put the lining into a stainless steel reactor, and keep it warm at 160°C for 16 hours. After the reactor naturally cools down to room temperature, take out the graphite filled with ethanol ene / iron tetroxide gel-like material, and completely replace it with water system.

[0158] 3) The above water system was gradually frozen to a solid state at -30°C.

[0159] 4) Freeze-dry the obtained solid composite of graphene / ferric oxide and ice at 5° C. for 150 h. Then the graphene / ferric oxide composite material is obtained.

[0160] 5) In an inert gas of argon, heat-treat the obtained above-mentioned graphen...

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Abstract

The invention provides a graphene / ferroferric oxide composite material which comprises reduced graphene oxide and ferroferric oxide nanoparticles and is of a three-dimensional porous structure. The invention further provides a preparation method of a graphene / ferroferric oxide composite material, the graphene / ferroferric oxide composite material prepared according to the preparation method and application of the graphene / ferroferric oxide composite material. In some embodiments, the graphene / ferroferric oxide composite material can be used as or used for preparing an electromagnetic wave shielding material or an electromagnetic wave absorbing material.

Description

technical field [0001] This application belongs to the field of materials. Specifically, the present application relates to a graphene / ferric oxide composite material, its preparation method and use. Background technique [0002] In recent years, the rapid changes in the field of science and technology have made life full of various electronic and electrical equipment for convenient living, and at the same time formed an increasingly complex electromagnetic environment, and the resulting more serious electromagnetic radiation and electromagnetic interference have greatly affected the human body. Health and proper functioning of electronic equipment. Among them, excessive electromagnetic radiation will interfere with the human body's metabolism, immunity, and reproductive system, and electromagnetic signal interference between equipment will cause confusion in communication and detection signals, and failure of related components of precision electronic and electrical equipm...

Claims

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Application Information

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IPC IPC(8): H05K9/00C09K3/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C09K3/00H05K9/0081
Inventor 黄毅陈永胜陈宏辉黄智宇
Owner NANKAI UNIV
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