Flexible and Ultrathin Waterproof Cellular Membranes Based on High-Conjunction Metal-Wrapped Polymer Nanofibers for Electromagnetic Interference Shielding.,Advanced Materials

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Flexible and Ultrathin Waterproof Cellular Membranes Based on High-Conjunction Metal-Wrapped Polymer Nanofibers for Electromagnetic Interference Shielding.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-03-29 , DOI: 10.1002/adma.201908496
Zhihui Zeng ₁ , Fuze Jiang _{1,

2} , Yang Yue _{1,

2} , Daxin Han ₃ , Luchan Lin ₁ , Shanyu Zhao ₁ , Yi-Bo Zhao _{1,

2} , Zhengyuan Pan _{1,

2,

4} , Congju Li ₅ , Gustav Nyström _{1,

6} , Jing Wang _{1,

2}

Affiliation

Ultrathin, lightweight, and flexible electromagnetic interference (EMI) shielding materials are urgently demanded to address EM radiation pollution. Efficient design to utilize the shields' microstructures is crucial yet remains highly challenging for maximum EMI shielding effectiveness (SE) while minimizing material consumption. Herein, novel cellular membranes are designed based on a facile polydopamine-assisted metal (copper or silver) deposition on electrospun polymer nanofibers. The membranes can efficiently exploit the high-conjunction cellular structures of metal and polymer nanofibers, and their interactions for excellent electrical conductivity, mechanical flexibility, and ultrahigh EMI shielding performance. EMI SE reaches more than 53 dB in an ultra-broadband frequency range at a membrane thickness of merely 2.5 µm and a density of 1.6 g cm-3 , and an SE of 44.7 dB is accomplished at the lowest thickness of 1.2 µm. The normalized specific SE is up to 232 860 dB cm2 g-1 , significantly surpassing that of other shielding materials ever reported. More, integrated functionalities are discovered in the membrane, such as antibacterial, waterproof properties, excellent air permeability, high resistance to mechanical deformations and low-voltage uniform heating performance, offering strong potential for applications in aerospace and portable and wearable smart electronics.

中文翻译：

基于高结合金属包裹的聚合物纳米纤维的柔性超薄防水细胞膜，用于电磁干扰屏蔽。

迫切需要超薄，轻巧和灵活的电磁干扰（EMI）屏蔽材料，以解决EM辐射污染问题。有效利用屏蔽的微结构进行设计至关重要，但要在最大程度地降低材料消耗的同时实现最大的EMI屏蔽效果（SE）仍然具有很高的挑战性。本文中，基于在电纺聚合物纳米纤维上的容易的聚多巴胺辅助的金属（铜或银）沉积来设计新颖的细胞膜。这些膜可以有效利用金属和聚合物纳米纤维的高结胞结构，以及它们之间的相互作用，从而具有出色的导电性，机械柔韧性和超高EMI屏蔽性能。EMI SE在膜厚仅为2的超宽带频率范围内达到53 dB以上。在最低厚度为1.2 µm时，可实现5 µm的密度和1.6 g cm-3的密度以及44.7 dB的SE。归一化的特定SE高达232860 dB cm2 g-1，大大超过了以往报道的其他屏蔽材料。此外，膜中还发现了集成功能，例如抗菌，防水性能，出色的透气性，对机械变形的高抵抗力以及低压均匀加热性能，为航空航天以及便携式和可穿戴智能电子产品提供了强大的潜力。

更新日期：2020-03-29

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