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首页> 外文期刊>RSC Advances >Flexible PEBAX/graphene electromagnetic shielding composite films with a negative pressure effect of resistance for pressure sensors applications
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Flexible PEBAX/graphene electromagnetic shielding composite films with a negative pressure effect of resistance for pressure sensors applications

机译：具有电阻负压效应的柔性PEBAX /石墨烯电磁屏蔽复合膜，适用于压力传感器应用

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摘要

In the current work, we fabricated flexible poly(ether- block -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.
机译：在当前的工作中，我们通过方便的熔融共混和压缩成型技术的组合，制造了柔性聚（醚嵌段酰胺）（PEBAX）/石墨烯复合膜。石墨烯含量会显着影响机械性能，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 vol％石墨烯的导电渗透阈值。通过引入4.45 vol％和8.91 vol％的石墨烯含量，复合膜的平均EMI可以分别达到16.6 dB和30.7 dB。更有趣的是，PEBAX /石墨烯复合材料在外部压力增加的刺激下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的减小导致了更多导电路径的形成。此外，这些复合材料在通过循环压力加载稳定后表现出良好的感测稳定性，可恢复性和可再现性。本研究为大规模制备弹性体NPC传感器和智能EMI屏蔽设备提供了指导。

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