可拉伸高电磁屏蔽石墨烯/PDMS复合膜的制备

Preparation of stretchable graphene/PDMS composite films with excellent electromagnetic performance

飞机、卫星等飞行器装载有多种关键电子元器件,易受强电磁场环境干扰;同时飞行器的部分结构在工作中需满足大形变、可拉伸等力学要求,因此高导电、可拉伸电磁屏蔽材料受到广泛关注。以氧化石墨烯为原料,通过流延法和高温石墨化处理制备了厚度为13.5μm的高导电柔性石墨烯薄膜(GP-4),其电导率和电磁屏蔽效能分别为6010 S/cm和68.4 dB。以预拉伸的波纹状聚二甲基硅烷(PDMS)为基底,制备了具有双层结构的GP-4/PDMS-50.5复合膜,轴向拉伸应变高达50.5%。当GP-4/PDMS-50.5复合膜轴向拉伸应变为50.5%及拉伸循环次数为500时,该复合膜仍能保持优异的导电性能和电磁屏蔽性能。其中,复合膜的电阻与GP-4薄膜基本一致,分别为1.04Ω和1.06Ω;复合膜的电磁屏蔽效能高达68.5 dB和67.7 dB。这些优良性能表明了GP-4/PDMS-50.5复合膜在柔性电子设备的电磁屏蔽领域具有巨大应用前景。

Aircraft,satellites and other aircraft with key electronic components,are susceptible to interference from strong electromagnetic field.And some structures of aircraft need to meet mechanical requirements such as large deformation and stretchability in work.Therefore,highly conductive and stretchable electromagnetic shielding materials have attracted widespread attention.Using graphene oxide as raw material and through casting method and high-temperature graphitization treatment,a highly conductive and flexible graphene film compressed with four layer porous fims(GP-4)with the thickness of 13.5μm was prepared,whose electrical conductivity and electromagnetic shielding efficiency were 6010 S/cm and 68.4 dB,respectively.Using polydimethylsilane(PDMS)as the base,GP-4/PDMS-50.5 composite film with stretchable bilayer structure was prepared,whose elongation was as high as 50.5%.When the axial tensile strain of the composite film is 50.5%and the number of stretching cycles is 500,the composite film could still maintain excellent conductivity and electromagnetic shielding performance.Among them,the resistance of the composite film is 1.04Ωand 1.06Ω,keeping constant with the GP-4 film almost.The electromagnetic shielding efficiency of the composite film is as high as 68.5 dB and 67.7 dB.These excellent properties indicate that GP-4/PDMS-50.5 composite film has great application prospects in the electromagnetic shielding field of flexible electronic devices.