Abstract With the noticeable growing rate of electronics, materials with good flexibility and high conductivity that can provide electromagnetic interference (EMI) shielding with minimal thickness are urgently needed. Here, for the first time, we demonstrate the potential of a non-woven composite film with unique core-shell and sandwich combined microstructure for EMI shielding. A 0.27-mm-thick reduced graphene oxide coated Fe3O4@SiO2@polypyrrole (FSPG) composite film exhibited an average EMI shielding effectiveness of 32 dB (specific EMI shielding effectiveness can be ∼ 12,608.4 dB cm2 g−1). This performance originates from the relative high electrical conductivity of FSPG films (0.71 S/cm) and multiple internal reflections from the interconnected core-shell and sandwich microstructure in the free-standing films. The mechanical flexibility offered by the FSPG films enable them to be considered as a new alternative material with efficient EMI shielding.

中文翻译：

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由还原氧化石墨烯覆盖的轻质、柔韧和坚固的核壳无纺布，用于高性能电磁干扰屏蔽

摘要 随着电子产品的显着增长，迫切需要具有良好柔韧性和高导电性的材料，能够以最小的厚度提供电磁干扰（EMI）屏蔽。在这里，我们首次展示了具有独特核壳和夹层组合微结构的非织造复合膜在 EMI 屏蔽方面的潜力。0.27 毫米厚的还原氧化石墨烯涂层 Fe3O4@SiO2@聚吡咯 (FSPG) 复合膜表现出平均 32 dB 的 EMI 屏蔽效率（特定的 EMI 屏蔽效率可以为 ~ 12,608.4 dB cm2 g-1）。这种性能源于 FSPG 薄膜的相对高电导率 (0.71 S/cm) 和自支撑薄膜中相互连接的核壳和夹层微结构的多次内部反射。