Zhao Biao, Zhang Xi, Deng Jiushuai, Zhang Chun, Li Yang, Guo Xiaoqin, Zhang Rui
Henan Key Laboratory of Aeronautical Materials and Application Technology, School of Material Science and Engineering, Zhengzhou University of Aeronautics Zhengzhou Henan 450046 China
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Land Resource Engineering, Kunming University of Science and Technology Kunming 650093 China
RSC Adv. 2020 Jan 8;10(3):1535-1543. doi: 10.1039/c9ra08679j. eCollection 2020 Jan 7.
In the current work, we fabricated flexible poly(ether--amide) (PEBAX)/graphene composite films by a combination of facile melt blending and compression molding technique. The graphene content significantly affects the mechanical properties, electrical conductivity and electromagnetic interference (EMI) shielding performance. An electrically conductive percolation threshold of 1.75 vol% graphene was obtained in the PEBAX/graphene composites. With the introduction of 4.45 vol%, and 8.91 vol% graphene content, the average EMI SE of composite films could reach 16.6 and 30.7 dB, respectively. More interestingly, the PEBAX/graphene composite exhibited a nearly-linear negative pressure coefficient (NPC) effect of resistance with increasing outer pressure stimulation, which was attributed to the formation of more conductive pathways caused by the decreased distance between adjacent graphene. In addition, these composites demonstrated good sensing stability, recoverability and reproducibility after stabilization by cyclic pressure loading. The current study provides guidelines for the large-scale preparation of elastomer NPC sensors and smart EMI shielding devices.
在当前工作中，我们通过简便的熔融共混和压缩成型技术相结合的方法制备了柔性聚（醚 - 酰胺）（PEBAX）/石墨烯复合薄膜。石墨烯含量显著影响其机械性能、电导率和电磁干扰（EMI）屏蔽性能。在PEBAX/石墨烯复合材料中获得了1.75体积％石墨烯的导电渗流阈值。随着石墨烯含量分别引入4.45体积％和8.91体积％，复合薄膜的平均EMI屏蔽效能（SE）可分别达到16.6 dB和30.7 dB。更有趣的是，随着外部压力刺激增加，PEBAX/石墨烯复合材料表现出近乎线性的电阻负压系数（NPC）效应，这归因于相邻石墨烯之间距离减小导致形成更多导电通路。此外，通过循环压力加载稳定后，这些复合材料表现出良好的传感稳定性、可恢复性和可重复性。当前研究为弹性体NPC传感器和智能EMI屏蔽装置的大规模制备提供了指导。
