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Broadband adjustable graphene electromagnetic wave absorbing material and preparation method thereof

An absorbing material, graphene technology, applied in the direction of electrical components, magnetic/electric field shielding, antennas, etc., can solve the problems that cannot satisfy the active adjustable electromagnetic wave absorption performance and the limitation of the use range, and achieve excellent comprehensive performance. High antioxidant, anti-oxidation effect

Active Publication Date: 2021-01-01
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] None of the above existing technologies can well satisfy the actively adjustable electromagnetic wave absorption performance, so the scope of use is limited. The development can well meet the requirements of active adjustable, and it is necessary to achieve the adjustment of the electromagnetic wave absorption frequency in the X-band

Method used

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  • Broadband adjustable graphene electromagnetic wave absorbing material and preparation method thereof
  • Broadband adjustable graphene electromagnetic wave absorbing material and preparation method thereof
  • Broadband adjustable graphene electromagnetic wave absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) Through the improved Hummer's method, using natural graphite flakes as raw materials, small pieces of graphene oxide (SGO) were prepared by controlling the size of natural flake graphite, the amount of oxidant, the reaction temperature, the oxidation time and the subsequent centrifugation process to control the size. ), with a size of 40–50 μm (SGO).

[0047] 2) First, dissolve 250 mg of graphene oxide in ethanol, and then prepare a 18cm*18cm square polytetrafluoroethylene mold, slowly drop the graphene oxide dispersion into the mold, and spin-coat the graphene oxide The dispersion liquid is evenly distributed in the mold, so that the thickness of the graphene oxide film is about 15 μm, and then put into an oven for drying at 60° C., and two graphene oxide films are prepared by the same method.

[0048] 3) Lithium perchlorate (LiClO 4 ), and polymethyl methacrylate (PMMA) in acetonitrile solvent, heated at 50°C and mixed evenly, poured the mixed solution into a 18cm...

Embodiment 2

[0061] 1) Through the improved Hummer's method, using natural graphite flakes as raw materials, small pieces of graphene oxide (SGO) were prepared by controlling the size of natural flake graphite, the amount of oxidant, the reaction temperature, the oxidation time and the subsequent centrifugation process to control the size. ), with a size of 40–50 μm (SGO).

[0062] 2) First, dissolve 400 mg graphene oxide in ethanol, then prepare a 18cm*18cm square polytetrafluoroethylene mold, slowly drop the graphene oxide dispersion into the mold, and spin coat the graphene oxide The dispersion liquid is evenly distributed in the mold, so that the thickness of the graphene oxide film is about 30 μm, and then put into an oven for drying at 60° C., and two graphene oxide films are prepared by the same method.

[0063] 3) Add lithium bistrifluoromethylsulfonylamide (LiTSFI) and polyethylene oxide (PEO) into acetonitrile solvent, heat at 50°C and mix well, pour the mixed solution into a 18c...

Embodiment 3

[0072]1) Through the improved Hummer's method, using natural graphite flakes as raw materials, small pieces of graphene oxide (SGO) were prepared by controlling the size of natural flake graphite, the amount of oxidant, the reaction temperature, the oxidation time and the subsequent centrifugation process to control the size. ), with a size of 40–50 μm (SGO).

[0073] 2) First, dissolve 250 mg of graphene oxide in ethanol, and then prepare a 18cm*18cm square polytetrafluoroethylene mold, slowly drop the graphene oxide dispersion into the mold, and spin-coat the graphene oxide The dispersion liquid is evenly distributed in the mold, so that the thickness of the graphene oxide film is about 15 μm, and then placed in an oven for drying at 60 ° C, and two graphene oxide films are prepared by the same method.

[0074] 3) Add lithium bistrifluoromethylsulfonylamide (LiTSFI) and polyethylene oxide (PEO) into acetonitrile solvent, heat at 50°C and mix well, pour the mixed solution int...

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Abstract

The invention relates to a broadband adjustable graphene electromagnetic wave absorbing material and a preparation method thereof. The preparation method comprises the following steps: preparing fourkinds of single-layer graphene oxide with different sizes, and then reducing the graphene oxide; attaching the reduced graphene oxide to a conductive medium to form a first electromagnetic wave absorption interlayer; preparing a graphene thin film as a surface electrode by adopting a chemical vapor deposition method, and preparing an oxide thin film as a dielectric layer on the graphene thin filmby adopting an electron beam evaporation coating method to form a second layer of wave-absorbing sandwich structure; fusing a semiconductor oxide and a conductive polymer to form a third layer of wave-absorbing sandwich structure; and forming a three-dimensional structure graphene oxide wave-absorbing material as a fourth layer of wave-absorbing structure through hydrothermal reaction. Different voltages are given to the top-layer graphene and the bottom-layer graphene, so that the absorption performance of electromagnetic waves is regulated and controlled. The invention aims to prepare the efficient, stable and adjustable electromagnetic wave absorbing material by using a simple method, and the purpose of active adjustability is achieved for different environments.

Description

technical field [0001] The invention relates to a broadband tunable graphene electromagnetic wave absorbing material and a preparation method thereof, specifically an adjustable electromagnetic wave absorbing structure. Multilayer broadband tunable graphene electromagnetic wave absorbing materials are selected to study multilayer wave absorbing structures and devices in The voltage-impedance response characteristic under the condition of applied load voltage realizes the function of amplitude modulation and frequency modulation. Background technique [0002] The rapid development of modern radio technology and radar detection technology has greatly improved the ability of the aircraft detection system to search and track targets. Traditional combat weapon systems are increasingly threatened, and stealth technology has become an effective means to improve weapon survival and defense, especially in-depth strike capabilities. For the ever-changing environment on the battlefiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00H01Q17/00
CPCH05K9/0071H05K9/0088H01Q17/007
Inventor 黄毅蔡志灏马文乐
Owner NANKAI UNIV
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