Yao Bin, Hong Wei, Chen Tianwu, Han Zhubing, Xu Xinwei, Hu Renchao, Hao Jianyu, Li Changhao, Li He, Perini Steven E, Lanagan Michael T, Zhang Sulin, Wang Qing, Wang Hong
State Key Laboratory for Mechanical Behavior of Materials, School of Material Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.
Adv Mater. 2020 Apr;32(14):e1907499. doi: 10.1002/adma.201907499. Epub 2020 Feb 20.
Polymer composites with electrically conductive fillers have been developed as mechanically flexible, easily processable electromagnetic interference (EMI) shielding materials. Although there are a few elastomeric composites with nanostructured silvers and carbon nanotubes showing moderate stretchability, their EMI shielding effectiveness (SE) deteriorates consistently with stretching. Here, a highly stretchable polymer composite embedded with a three-dimensional (3D) liquid-metal (LM) network exhibiting substantial increases of EMI SE when stretched is reported, which matches the EMI SE of metallic plates over an exceptionally broad frequency range of 2.65-40 GHz. The electrical conductivities achieved in the 3D LM composite are among the state-of-the-art in stretchable conductors under large mechanical deformations. With skin-like elastic compliance and toughness, the material provides a route to meet the demands for emerging soft and human-friendly electronics.
具有导电填料的聚合物复合材料已被开发为具有机械柔韧性、易于加工的电磁干扰（EMI）屏蔽材料。尽管有一些含有纳米结构银和碳纳米管的弹性体复合材料表现出适度的拉伸性，但其电磁干扰屏蔽效能（SE）会随着拉伸而持续下降。在此，报道了一种嵌入三维（3D）液态金属（LM）网络的高拉伸性聚合物复合材料，该材料在拉伸时电磁干扰SE大幅增加，在2.65 - 40 GHz的极宽频率范围内与金属板的电磁干扰SE相当。3D LM复合材料所实现的电导率在承受大机械变形的可拉伸导体中处于先进水平。该材料具有类似皮肤的弹性柔顺性和韧性，为满足新兴的柔软且对人体友好的电子产品的需求提供了一条途径。
