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Preparation method for highly-oriented electromagnetic shielding membrane by assembling graphene and metal layer by layer

An electromagnetic shielding film and layer-by-layer assembly technology, applied in the direction of graphene, magnetic/electric field shielding, non-metallic elements, etc., can solve the problems of reducing the effectiveness of graphene, failing to achieve composite effects, and failing to achieve assembly, etc., to achieve electromagnetic shielding Good effect, improved absorption and conduction performance, shielding frequency bandwidth effect

Active Publication Date: 2016-07-06
ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the existing preparation methods have the following problems: first, the so-called graphene film is not a real graphene assembly film, but a graphite film, which greatly reduces the effectiveness of graphene; second, the current graphene metal Composite membranes cannot be perfectly assembled, just coating a layer of metal on the surface cannot achieve the desired composite effect; third, its continuous large-scale preparation is still a big challenge

Method used

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  • Preparation method for highly-oriented electromagnetic shielding membrane by assembling graphene and metal layer by layer
  • Preparation method for highly-oriented electromagnetic shielding membrane by assembling graphene and metal layer by layer
  • Preparation method for highly-oriented electromagnetic shielding membrane by assembling graphene and metal layer by layer

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Embodiment 1

[0029] Example 1: Preparation of Graphene Oxide without Fragmentary Super Large Sheets

Embodiment 1-1

[0031] (1) Slowly add potassium permanganate into the rapidly stirring concentrated sulfuric acid at -10°C. After fully dissolving, add graphite, stir slowly at 60 rpm for 2 hours, then stop stirring. Reaction 6h, obtain the graphite oxide crystal of wide distribution respectively; As figure 1 As shown, there are more fragments in the graphite oxide wafers obtained under the two temperatures, which makes its corresponding graphene oxide also have a lot of fragments ( figure 2 ).

[0032] (2) The reaction solution obtained in step 1 is diluted with concentrated sulfuric acid (the dilution factor can be any multiple, and the present embodiment is diluted about 10 times), and the graphite oxide crystals are filtered out with a titanium alloy mesh sieve with a 150um aperture (140 mesh) (Reaction solution recovery), and slowly pour into rapidly stirred ice water relative to 10 times the volume of the filtered product, leave standstill for 2h, slowly add H 2 o2 , to remove the ex...

Embodiment 1-2

[0035] Slowly add potassium permanganate into the rapidly stirring concentrated sulfuric acid at -10°C. After fully dissolving, add graphite, stir slowly at 60 rpm for 2 hours, stop stirring, and react at low temperature (0°C) for 48 hours to obtain Reaction solution; the reaction solution is diluted with the concentrated sulfuric acid with mass fraction more than 98% and the dilute sulfuric acid with mass fraction of 10% respectively, then graphite oxide crystals are filtered out (reaction solution recovery) with the titanium alloy mesh screen of 150um aperture, and Slowly pour into rapidly stirred ice water 10 times the volume of the filtered product, let it stand for 2h, and slowly add H 2 o 2 , to remove excess potassium permanganate in the reaction, add an appropriate amount of hydrochloric acid until the flocculent graphite oxide disappears, and then filter out the graphite oxide wafers with a titanium alloy mesh sieve; slowly shake and wash the shaker to obtain the reac...

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Abstract

The invention discloses a preparation method for a highly-oriented electromagnetic shielding membrane by assembling graphene and metal layer by layer. The method comprises the following steps of preparing a graphene oxide gel membrane from oversized fragment-free graphene oxide, freezing the graphene oxide gel membrane, and introducing the frozen graphene oxide gel membrane into a high-temperature furnace for high-temperature thermal treatment at 3,000 DEG C, thus acquiring an oriented graphene aerogel membrane with high heat conduction, electrical conduction and ultralight weight; depositing metal on the surface of a graphene sheet layer in the graphene aerogel membrane by chemical electroplating to obtain the electromagnetic shielding membrane taking a graphene membrane as a substrate and formed by stacking the grapheme and metal layer by layer; and pressing the graphene aerogel and metal composite membrane with high pressure to obtain the graphene and metal composite membrane. The graphene and metal composite membrane prepared according to the method has the advantages of high conductivity and wide absorption bandwidth, the thickness and the size both can be adjusted, a microstructure is regular, and the graphene and metal composite membrane has wide application prospect in the field of electromagnetic shielding and wave absorption.

Description

technical field [0001] The invention relates to a method for preparing an electromagnetic shielding film, in particular to a method for preparing an electromagnetic shielding film assembled with highly oriented graphene metal layers. Background technique [0002] The interference of electronic components to the outside world is called EMI (Electromagnetic Interference). With the development of information and communication equipment, electronic and electrical products tend to be multi-functional and miniaturized, the number of portable electronic products is increasing rapidly, and electromagnetic wave pollution in the environment is also becoming more and more serious, which not only causes various instrument function failures and system errors, but also easily harms the human body. make an impact. Traditional battery shielding materials are based on metals, which have the disadvantages of high material density, easy corrosion, and narrow absorption band. Therefore, requi...

Claims

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Application Information

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IPC IPC(8): H05K9/00C01B31/04
CPCC01B2204/22C01B2204/32H05K9/0088
Inventor 高超彭蠡孙海燕杨清
Owner ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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