表面金属化对多孔材料电磁屏蔽性能的影响

Effect of Surface Metallization of Porous Materials on their EMI Shielding Performance

针对新型多孔柔性电磁屏蔽材料,从对两种不同的表面金属化方式入手,研究了表面金属化对多孔材料电磁屏蔽性能的影响。结果显示,电导率较高的海绵/银纳米线样品展现出更优秀的电磁屏蔽性能,其最高电磁屏蔽性能可达40dB。通过对材料电学性能的研究,结合平面波理论,对海绵/银纳米线和海绵/银纳米颗粒两组样品的不同电磁屏蔽性能给出了相应的原理解释:由于一维银纳米线的特殊柔性及导电性使得其构成连续导电网络,这相对于零维银纳米颗粒的岛状局域传导结构更易产生表面等离子体共振效应,从而有效反射电磁波。

Pointing at the new porous flexible electromagnetic shielding materials,this work studies the influence of surface metallization on the electromagnetic shielding performance of porous materials from two different surface metallization methods.The results showed that the sponge/silver nanowire samples with higher conductivity showed better electromagnetic shielding performance,with the highest electromagnetic shielding performance up to 40 dB.Based on the the electrical property measurement and the plane wave theory,we explained the reason that sponge/silver nanowires and sponge/silver nanoparticles showed different electromagnetic shielding performance.The special flexibility and conductivity of one-dimensional silver nanowires make it easily to form a continuous conductive network.Compared to zero-dimensional silver nanoparticles with local conduction structure,silver nanowires are more likely to occur the surface plasmon resonance effect,then effectively reflect electromagnetic waves.