RGONs@Fe3O4/WPU超细纤维合成革的制备及其电磁屏蔽性能

Preparation and electromagnetic shielding performance of RGONs@Fe3O4/WPU superfine fiber synthetic leather

以氧化石墨烯(GO)、FeSO4和FeCl3为原料,采用共沉淀法制备了还原氧化石墨烯纳米片RGONs@Fe3O4杂化纳米片,用物理共混-平板刮涂法得到了一种新型RGONs@Fe3O4/水性聚氨酯(WPU)超细纤维合成革。利用Raman、XPS、XRD、SEM、TEM等对RGONs@Fe3O4杂化纳米片进行了表征。考察了RGONs@Fe3O4/WPU超细纤维合成革的电、磁特性及电磁屏蔽效能,并讨论了其屏蔽机理。结果表明,当n(GO)∶n(Fen+)=1∶10时〔其中,Fen+为n(Fe2+)∶n(Fe3+)=1.00∶1.75的铁盐〕,纳米Fe3O4粒子均匀沉积在RGONs片层表面,该复合结构有效减弱了RGONs片与片之间的π-π堆叠效应。随着RGONs@Fe3O4杂化纳米片含量的增加,RGONs@Fe3O4/WPU超细纤维合成革的电磁屏蔽性能明显提升,当RGONs@Fe3O4杂化纳米片添加量为5%(以WPU质量计,下同)时,RGONs@Fe3O4/WPU超细纤维合成革在8.2~12.4 GHz频率范围内的电磁屏蔽系数(EMI SE)可以达到36dB,比RGONs/WPU超细纤维合成革提高约40%。RGONs@Fe3O4杂化纳米片的表面效应及电、磁双损耗特性是协同增强RGONs@Fe3O4/WPU超细纤维合成革电磁屏蔽性能的关键机制。

Reduced graphene oxide(RGONs)@Fe3O4 hybrid nanosheets were prepared by coprecipitation method from graphene oxide(GO),FeSO4 and Fe Cl3.A new type of RGONs@Fe3O4/waterborne polyurethane(WPU)superfine fiber synthetic leather was obtained by physical blending and doctor-blading method.RGONs@Fe3O4 hybrid nanosheets were characterized by Raman,XPS,XRD,SEM and TEM.The electrical and magnetic characteristics and electromagnetic shielding efficiency of RGONs@Fe3O4/WPU superfine fiber synthetic leather were investigated.And the shielding mechanism was discussed.The results showed that under the condition of n(GO):n(Fen+)=1:10[Fen+is a mixture with n(Fe2+):n(Fe3+)=1.00:1.75],Fe3O4 nanoparticles were deposited uniformly on the surface of RGONs sheets,the composite structure effectively reduced theπ-πstacking effect among RGONs nanosheets.With the increase of the dosage of RGONs@Fe3O4 hybrid nanosheets,the electromagnetic characteristics of RGONs@Fe3O4/WPU superfine fiber synthetic leather obviously improved.When the dosage of RGONs@Fe3O4 was 5%(based on the mass of WPU,the same below),the electromagnetic shielding coefficient(EMI SE)of RGONs@Fe3O4/WPU superfine fiber synthetic leather in the frequency range of 8.2~12.4 GHz could reach 36 dB,which was about 40%higher than that of RGONs/WPU superfine fiber synthetic leather.The surface effect and electrical and magnetic double loss characteristics of the RGONs@Fe3O4 hybrid nanosheets is the key to enhance the electromagnetic shielding performance of the composite leather.