There is usually a tough trade-off between the mechanical property and the shielding performance in electromagnetic interference shielding (EMI) materials, especially for those ultrathin and porous film-based devices. Herein, we report an ultrathin and flexible RGO/CNF@Ag–Fe3O4 (RGCF) porous film for EMI shielding application by a vacuum-assisted filtration method and a hydrazine-induced foaming process. The RGCF-3 porous film exhibits outstanding mechanical properties with a tensile strength of 175.5 MPa. As expected, the EMI shielding effectiveness of the lightweight RGCF-3 porous film (21.0 dB) is much higher than that of the compact film (10.4 dB), due to the improved efficient wave attenuation within the cellular space. Therefore, the flexible and lightweight RGCF porous film with applicable EMI shielding and superior mechanical strength is highly promising for applications in wearable electronics.

中文翻译：

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一种具有优异机械强度的高柔性和多孔石墨烯基混合薄膜，可有效屏蔽电磁干扰

电磁干扰屏蔽 (EMI) 材料的机械性能和屏蔽性能之间通常存在艰难的权衡，尤其是对于那些基于超薄和多孔膜的设备。在此，我们通过真空辅助过滤方法和肼诱导发泡工艺报告了一种用于 EMI 屏蔽应用的超薄柔性 RGO/CNF@Ag-Fe3O4（RGCF）多孔膜。RGCF-3 多孔膜表现出优异的机械性能，拉伸强度为 175.5 MPa。正如预期的那样，由于蜂窝空间内的有效波衰减得到改善，轻型 RGCF-3 多孔膜的 EMI 屏蔽效率 (21.0 dB) 远高于致密薄膜 (10.4 dB)。所以，