Electromagnetic interference (EMI) shielding materials with high performance and low density are urgently needed with the rapid development of electronic communications. In this work, tuning solid–air interface of graphene paper was carried out to enhance multiple reflections of incident electromagnetic waves for high-performance EMI shielding. The large amount solid–air interface (57.8 m 2 g −1 ) endowed the porous graphene paper with a high EMI shielding effectiveness (SE) of 31.0 dB, 50% enhancement from its counterpart of solid graphene paper. This porous graphene paper also showed an ultralow density of 0.02 g cm −3 , an 18.5-fold decrease from its counterpart of solid graphene paper. Moreover, the EMI SE of obtained graphene papers exhibited proportional relationship with their specific surface area, further confirming the vital role of solid–air interface in the enhancement of EMI shielding. This work quantitatively demonstrates the significance of solid–air interface area for enhancing the EMI shielding performance and proposes an efficient guideline for the design of high-performance and low-density EMI shielding materials.

中文翻译：

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调整多孔石墨烯纸的固体-空气界面以增强电磁干扰屏蔽

随着电子通信的快速发展，迫切需要高性能、低密度的电磁干扰（EMI）屏蔽材料。在这项工作中，对石墨烯纸的固体-空气界面进行了调谐，以增强入射电磁波的多次反射，以实现高性能 EMI 屏蔽。大量的固体-空气界面 (57.8 m 2 g -1 ) 赋予多孔石墨烯纸 31.0 dB 的高 EMI 屏蔽效率 (SE)，比固体石墨烯纸的对应物提高了 50%。这种多孔石墨烯纸还显示出 0.02 g cm -3 的超低密度，与其对应的固体石墨烯纸相比降低了 18.5 倍。此外，所得石墨烯纸的 EMI SE 与其比表面积呈正比关系，进一步证实了固体-空气界面在增强 EMI 屏蔽方面的重要作用。这项工作定量地证明了固体-空气界面面积对于提高 EMI 屏蔽性能的重要性，并为高性能和低密度 EMI 屏蔽材料的设计提出了有效的指导方针。