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首页> 外文期刊>Journal of industrial and engineering chemistry >Flexible Nanoporous Silver Membranes with Unprecedented High Effectiveness for Electromagnetic Interference Shielding
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Flexible Nanoporous Silver Membranes with Unprecedented High Effectiveness for Electromagnetic Interference Shielding

机译：柔性纳米多孔银膜，具有前所未有的电磁干扰屏蔽效能

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摘要

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 mu m exhibits high EMI shielding effectiveness (SE) of (similar to)53 dB (99.9%) in 0.5 - 18.0 GHz and an unprecedented high absolute EMI SE of 85,462 dB.cm(2).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. (C) 2020 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：为了满足柔性和可穿戴电子产品的快速发展，人们对厚度小、重量轻、灵活性强的电磁干扰（EMI）屏蔽材料的需求不断增加。为了满足这些要求，人们已经探索并改进了各种EMI屏蔽材料，以帮助实现电子设备的小型化，但这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，用于制备具有前所未有的高EMI屏蔽效率的柔性纳米多孔银（Ag）膜。通过连续真空过滤含有细菌纤维素和银纳米颗粒的分散体，然后热压工艺制备纳米多孔银膜。厚度为1.2μm的纳米多孔银膜在0.5-18.0 GHz范围内显示出53 dB（99.9%）的高EMI屏蔽效能（SE），以及前所未有的85462 dB绝对EMI SE。厘米（2）。g（-1），这可能是由于纳米多孔结构导致电磁波的多次反射增加。此外，纳米多孔银膜显示出高度稳定的机电耐久性和快速的散热性能，能够实现广泛应用所需的EMI屏蔽性能。（C） 2020年，韩国工业和工程化学学会。由爱思唯尔B.V.出版。版权所有。

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