Anisotropic magnetic liquid metal film for wearable wireless electromagnetic sensing and smart electromagnetic interference shielding
Anisotropic magnetic liquid metal film for wearable wireless electromagnetic sensing and smart electromagnetic interference shielding
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用于可穿戴无线电磁传感和智能电磁干扰屏蔽的各向异性磁性液态金属薄膜
DOI：
10.1016/j.nanoen.2021.106700
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发表时间：
2022-02
期刊：
影响因子：
17.6
通讯作者：
Xiaofang Liu
中科院分区：
文献类型：
--
作者：
Ruiqi Zhu;Zhenyang Li;Gao Deng;Yuanhang Yu;Jianglan Shui;Ronghai Yu;Caofeng Pan;Xiaofang Liu
能够合理利用电磁能量、防止电磁污染的智能可穿戴电磁（EM）功能材料对未来信息社会具有重要意义，但其设计和制备仍具有挑战性。本文以磁场诱导各向异性结构的磁性液态金属液滴填充弹性体为基础，制备了一种多功能电磁响应膜，该薄膜可以在循环拉伸过程中可逆地构建导电网络并调节非均质界面。这种薄膜可以承受高达600%的拉伸应变，并显示出拉伸增强的导电性。其电磁干扰屏蔽效能（SE）随着拉伸的增加而显著增加，相对SE变化量（δ SE/SE0）与拉伸应变呈线性响应。该薄膜的屏蔽效能（在400%应变下达到404 dB mm-1的超高值）和应变灵敏度优于其他可拉伸电磁功能材料。更有趣的是，该薄膜通过连续拉伸在电磁波传输和屏蔽之间快速切换，从而实现了可切换的电磁干扰屏蔽功能。此外，它还可以用于可穿戴式电磁传感器，通过记录电磁波强度的变化来无线监测人体的运动。
Smart and wearable electromagnetic (EM) functional materials that can reasonably use EM energy and prevent EM pollution are of great significance to the future information society, but their design and preparation are still challenging. Here, a multifunctional EM response film is prepared based on a magnetic liquid metal droplet-filled elastomer with magnetic field-induced anisotropic structure, which can reversibly construct conductive network and tune heterogeneous interface during cyclic stretching. This film can withstand up to 600% tensile strain and shows stretching-enhanced electrical conductivity. Its EM interference shielding effectiveness (SE) significantly increases with stretching, and the relative SE change (Delta SE/SE0) shows a linear response to the tensile strain. The specific shielding effectiveness (an ultrahigh value of 404 dB mm-1 at 400% strain) and strain sensitivity of the film outperform other stretchable EM functional materials. More interestingly, this film exhibits rapid switching between EM wave transmission and shielding through continuous stretching, which enables an off/on switchable EM interference shielding function. Furthermore, it can be used in a wearable EM sensor to wirelessly monitor human movements by recording changes of EM wave intensity.
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