碳纳米管含量对碳纳米管-纤维素复合材料电磁屏蔽性能的影响

Effect of Carbon Nanotube Content on Electromagnetic Interference Shielding Performance of Carbon Nanotube-Cellulose Composite Materials

以石墨化处理的碳纳米管为导电填料、纤维素纤维为基体,用真空抽滤法制备碳纳米管-纤维素纤维复合材料,用扫描电子显微镜、四探针电阻仪、矢量网络分析仪等手段对其进行了表征,研究了碳纳米管含量对碳纳米管-纤维素复合材料电磁屏蔽性能的影响。结果表明,样品的形状和电阻可控,具有良好的柔韧性、导电性能和电磁屏蔽性能。碳纳米管吸附于纤维上,构成了良好的导电网络。在碳纳米管加载量由10%提高到71%的过程中,碳纳米管复合纸的电导率和屏蔽性能明显提高,电导率由9.92 S/m提高为216.3 S/m,在175 MHz-1600 MHz频段屏蔽效能由15d B提高为45d B。

Composite sheets of carbon nanotubes-cellulose fibers were made by suction filtration method with cellulose fibers as matrix and graphitized CNTs as electroconductive agent. The products were characterized by scanning electron microscopy, shielding effectiveness, four-point probes, and while the effect of carbon nanotube content on the EMI shielding performance of the prepared composite sheets was investigated. The results show that the shape and conductivity is controllable for the compos- ite sheets, which then exhibits good flexibility, electrical conductivity and EMI shielding effectiveness. CNTs were adsorbed on the cellulose fibers and formed a continuously interconnected conductive network. With the increasing amount of CNTs from 10% to 71%, the conductivity of the composite sheets increased from 9.92 S/m to 216.3S/m and correspondingly their EMI shielding effectiveness increased from 15dB to 45dB in the frequency range 175 MHz-1600 MHz.