Abstract Demands for electromagnetic interference (EMI) shielding materials with small thickness, lightweight, and flexibility have been increasing to satisfy rapid advances in flexible and wearable electronics. Various EMI shielding materials have been explored and improved to meet these requirements for assist in the miniaturization of electronic devices, but is still a challenging task. In this work, we describe a simple and effective strategy for the fabrication of flexible nanoporous silver (Ag) membranes with unprecedented high effectiveness for EMI shielding. The nanoporous Ag membranes were fabricated by sequential vacuum filtration of a dispersion containing bacterial cellulose and Ag nanoparticles, which were followed by a hot-pressing process. The membrane with nanoporous Ag thickness of 1.2 μm exhibits high EMI shielding effectiveness (SE) of ˜53 dB (99.9%) in 0.5 − 18.0 GHz and an unprecedented high absolute EMI SE of 85,462 dB·cm2 g–1, which could be attributed to the nanoporous structures leading to an increasing of multiple reflections of the electromagnetic waves. In addition, the nanoporous Ag membrane showed highly stable electro-mechanical durability and fast heat dissipation properties, enabling desired EMI shielding performance for the wide range applications.

中文翻译：

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具有前所未有的高效电磁干扰屏蔽的柔性纳米多孔银膜

摘要 为满足柔性和可穿戴电子产品的快速发展，对具有小厚度、轻质和柔韧性的电磁干扰 (EMI) 屏蔽材料的需求不断增加。已经探索和改进了各种 EMI 屏蔽材料来满足这些要求以帮助电子设备的小型化，但仍然是一项具有挑战性的任务。在这项工作中，我们描述了一种简单有效的策略，用于制造具有前所未有的高效 EMI 屏蔽的柔性纳米多孔银 (Ag) 膜。纳米多孔银膜是通过对含有细菌纤维素和银纳米颗粒的分散体进行连续真空过滤，然后进行热压工艺来制造的。纳米多孔银膜厚度为1。2 μm 在 0.5 - 18.0 GHz 中表现出约 53 dB (99.9%) 的高 EMI 屏蔽效率 (SE) 和前所未有的 85,462 dB·cm2 g-1 的高绝对 EMI SE，这可能归因于纳米多孔结构导致增加电磁波的多次反射。此外，纳米多孔银膜表现出高度稳定的机电耐久性和快速散热特性，为广泛的应用提供所需的 EMI 屏蔽性能。