Highly flexible electromagnetic interference (EMI) shielding material with excellent shielding performance is of great significance to practical applications in next-generation flexible devices. However, most EMI materials suffer from insufficient flexibility and complicated preparation methods. In this study, we propose a new scheme to fabricate a magnetic Ni particle/Ag matrix composite ultrathin film on a paper surface. For a ~ 2-µm-thick film on paper, the EMI shielding effectiveness (SE) was found to be 46.2 dB at 8.1 GHz after bending 200,000 times over a radius of ~ 2 mm. The sheet resistance (R□) remained lower than 2.30 Ω after bending 200,000 times. Contrary to the change in R□, the EMI SE of the film generally increased as the weight ratio of Ag–Ni increased, in accordance with the principle that EMI SE is positively related to an increase in electrical conductivity. Desirable EMI shielding ability, ultrahigh flexibility, and simple processing provide this material with excellent application prospects.

中文翻译：

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基于超薄Ni/Ag复合材料的纸基高柔性电磁干扰屏蔽膜

具有优异屏蔽性能的高柔性电磁干扰（EMI）屏蔽材料对下一代柔性器件的实际应用具有重要意义。然而，大多数 EMI 材料都存在柔韧性不足和制备方法复杂的问题。在这项研究中，我们提出了一种在纸表面制造磁性镍颗粒/银基复合超薄膜的新方案。对于纸上约 2 µm 厚的薄膜，在约 2 mm 的半径内弯曲 200,000 次后，8.1 GHz 下的 EMI 屏蔽效率 (SE) 为 46.2 dB。弯曲 200,000 次后，薄层电阻 (R□) 仍低于 2.30 Ω。与 R□ 的变化相反，薄膜的 EMI SE 通常随着 Ag-Ni 重量比的增加而增加，根据 EMI SE 与电导率增加呈正相关的原理。理想的EMI屏蔽能力、超高的柔韧性和简单的加工工艺为这种材料提供了极好的应用前景。