Flexible liquid metal (LM)-based composite materials with strain-undiminished electromagnetic interference (EMI) shielding effectiveness (SE) and multifunctional integration are attracting great attention due to the urgent need for flexible electronic and wearable devices. Herein, stretchable and translucent polydimethylsiloxane/LM composite mesh (PLM) is developed by introducing highly deformable LM filler into elastomer and constructing conductive mesh structures by cast molding and mechanical sintering, which shows strain-enhanced EMI SE without a significant decrease in light transmittance due to the contribution of stretch-induced enhanced conductivity, mesh densification, and orientation. The linear response of relative SE change with tensile strain allows the PLM to exhibit ideal EM sensing characteristics, superior to most reported stretchable EMI shields. The oriented mesh structure endows the stretched PLM with anisotropic EMI SE under rotation, revealing a feasible means to realize tunable SE in a tensile state. More importantly, the high conductivity and deformability of the LM network further provide the PLM with excellent and relatively stable Joule-heating performance when served as a stretchable Joule heater. This work offers a new strategy for developing multifunctional stretchable LM-based composites that can achieve strain-enhanced EMI SE and ideal EM sensing capability without significantly sacrificing the light transmittance and Joule-heating performances under stretching.

中文翻译：

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用于多功能电磁屏蔽/传感和焦耳加热的可拉伸半透明液态金属复合网

由于柔性电子和可穿戴设备的迫切需求，具有应变不减电磁干扰（EMI）屏蔽效能（SE）和多功能集成的柔性液态金属（LM）基复合材料引起了人们的高度关注。在此，通过在弹性体中引入高变形LM填料，并通过浇注成型和机械烧结构建导电网状结构，开发出可拉伸、半透明的聚二甲基硅氧烷/LM复合网状结构（PLM），该结构表现出应变增强的EMI SE，而不会因光透射率显着下降而出现问题。拉伸引起的增强导电性、网格致密化和取向的贡献。相对 SE 变化随拉伸应变的线性响应使 PLM 能够表现出理想的 EM 传感特性，优于大多数报道的可拉伸 EMI 屏蔽。定向网格结构赋予拉伸PLM在旋转下具有各向异性EMI SE，揭示了在拉伸状态下实现可调谐SE的可行方法。更重要的是，LM网络的高导电性和可变形性进一步为PLM在用作可拉伸焦耳加热器时提供了优异且相对稳定的焦耳加热性能。这项工作为开发多功能可拉伸 LM 基复合材料提供了一种新策略，该复合材料可以实现应变增强的 EMI SE 和理想的 EM 传感能力，而不会显着牺牲拉伸下的透光率和焦耳热性能。