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层层组装制备高性能电磁屏蔽织物
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摘要
纳米电磁屏蔽材料常与聚合物复合用于制备涂层抵抗电磁波的伤害。然而,现成制备方法却无法实现纳米材料结构对性能的优化。我们利用层层组装技术在羊毛织物表面制备聚吡咯/氧化石墨烯(PPy/GO)多层膜用于电磁波的屏蔽。导电高分子PPy的电磁屏蔽性能由于GO片层的引入得到了明显的改善,这种在纳米尺度上多层堆积导电/绝缘材料,不仅获得了可控的电磁屏蔽效能,也获产生了快速的热扩散速度。所制备的层层组装PPy/GO织物具有高效、轻质的特点。300 nm的膜在维持织物原有的柔韧、蓬松的特性的同时,实现了对电磁波高达99.7%的屏蔽。本文证实了纳米膜结构调控对电磁屏蔽性能的作用,并进一步拓展了一种简单、普适的制备高性能电磁屏蔽材料的方法。
Conductive coatings with nanofillers are widely used for electromagnetic interference(EMI) shielding,but the preparation methods have limited their performance improvement by optimizing structure.Herein,we present a step-by-step strategy to construct ultrathin coatings with multilayer structure for high-efficiency EMI shielding.Polypyrrole(PPy) and graphene oxide(GO),as the models of conductor and insulator,are alternately deposited on wool fabric for constructing the multilayer structured coating of GO/PPy.The GO/PPy coating retains the softness,flexibility and sponginess of wool fabric,and endows the fabric with excellent EMI shielding effectiveness,fast thermal dissipation,and desirable stability.More importantly,the simple and universal step-by-step process realizes the control of EMI shielding,which is of significance to the premeditated fabrication of EMI shielding materials.This work demonstrates advantages of nanostructure in EMI shielding and provides a new strategy for designing of high-performance shielding materials.
引文
[1]L.Zou,S.Zhang,X.Li,C.Lan,Y.Qiu and Y.Ma,Adv.Mater.Interfaces 2016,3,1500476.
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    [2]D.D.L.Chung,J.Mater.Eng.Perform.2000,9,350.
    [3]S.Kim,J.S.Oh,M.G.Kim,W.Jang,M.Wang,Y.Kim,H.W.Seo,Y.C.Kim,J.H.Lee,Y.Lee,J.D.Nam,ACS Appl.Mater.Interfaces 2014,6,17647.
    [4]W.L.Song,J.Wang,L.Z.Fan,Y.Li,C.Y.Wang and M.S.Cao,ACS Appl.Mater.Interfaces 2014,6,10516.

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