层层组装氧化石墨烯/聚吡咯涂层棉织物的电磁屏蔽性能

为制备高效吸波型电磁屏蔽织物,采用层层组装法在棉织物表面构筑氧化石墨烯/聚吡咯(GO/PPy)功能膜。借助傅里叶红外光谱仪和扫描电子显微镜对GO/PPy涂层织物的结构进行表征,通过万用表和矢量网络分析仪测试织物的导电性能和电磁屏蔽性能。结果表明:织物的阳离子化处理有利于氧化石墨烯和聚吡咯的沉积,适宜的GO质量浓度(0.4 g/L)有利于提升织物的电磁屏蔽效能;随着组装层数的增加,织物的电磁屏蔽性能增加,当组装层数为20时,织物的电磁屏蔽效能达到39.2 dB,可屏蔽99.98%的电磁能;织物对电磁波的吸收率始终大于50%,其主要的屏蔽机制为吸收而非反射。

Electromagnetic shielding properties of graphene oxide/polypyrrole coated cotton fabric with layer-by-layer assembling method

To study the influence of deposition of graphene oxide (GO)/polypyrrole (PPy) and their concentrations on electromagnetic shielding property of coated fabric, and obtain highly efficient wave-absorbing electromagnetic shielding properties, GO/PPy functional film was constructed on a cotton fabric using layer-by-layer assembling method.The GO/PPy coated fabric structure was characterized by Fourier infrared spectrometer and scanning electron microscope, and the electrical conductivity and electromagnetic shielding properties of the fabric were tested by multimeter and vector network analyzer.The results show that the cationic treatment of the fabric is beneficial for the deposition of GO and PPy. It was found that optimal GO concentration (0.4 g/L) is beneficial to improve the electromagnetic shielding effectiveness of the fabric, and that with the increase of the number of assembled layers, the electromagnetic shielding efficiency of the coated fabric increases. In particular, when the number of assembled layers was 20, the electromagnetic shielding efficiency of the fabric reached 39.2 dB, which can shield 99.98% of the electromagnetic energy. The absorptivity of electromagnetic wave is always more than 50%. The main shielding mechanism is absorption, followed by reflection.