Spirally Structured Conductive Composites for Highly Stretchable, Robust Conductors and Sensors
Spirally Structured Conductive Composites for Highly Stretchable, Robust Conductors and Sensors
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用于高度拉伸、坚固的导体和传感器的螺旋结构导电复合材料
DOI：
10.1021/acsami.7b06256
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发表时间：
2017
影响因子：
9.5
通讯作者：
Canhui Lu
中科院分区：
文献类型：
--
作者：
Xiaodong Wu;Yangyang Han;Xinxing Zhang;Canhui Lu
柔性和可拉伸的电子器件对于下一代设备是非常期望的。然而，传统导电复合材料的拉伸性和导电性从根本上难以联合收割机结合，这限制了它们的广泛应用，特别是作为可拉伸电子产品。在这里，我们通过一种简单且可扩展的结构方法创新性地开发了一类新的高度可拉伸且坚固的导电复合材料。简而言之，碳纳米管被喷涂到一个自粘性橡胶膜上，然后将污物完全卷起，在复合材料中形成一个多层结构。这种独特的层状结构打破了传统导电复合材料的拉伸性和导电性之间的典型权衡，更重要的是，抑制了应变下导电层中机械微裂纹的产生和扩展。受益于这种结构引起的优点，多层复合材料表现出高拉伸性和柔性，良好的导电稳定性和优异的鲁棒性，使复合材料能够用作高度可拉伸的导体（高达300%应变），用于监测细微和大型人类活动的多功能传感器，以及可穿戴电子产品的功能线。这种新颖而有效的方法不仅为可拉伸导体和传感器的制造提供了新的设计理念，而且还为其他可拉伸电子器件（如晶体管、发电机、人造肌肉等）的制造提供了新的设计理念。
Flexible and stretchable electronics are highly desirable for next generation devices. However, stretchability and conductivity are fundamentally difficult to combine for conventional conductive composites, which restricts their widespread applications especially as stretchable electronics. Here, we innovatively develop a new class of highly stretchable and robust conductive composites via a simple and scalable structural approach. Briefly, carbon nanotubes are spray-coated onto a self-adhesive rubber film, followed by rolling up the, filth completely to create a spirally layered structure within the composites. This unique spirally layered structure breaks the typical trade-off between stretchability and conductivity of traditional conductive composites and, more importantly, restrains the generation and propagation of mechanical microcracks in the conductive layer under strain. Benefiting from such structure-induced advantages, the spirally layered composites,exhibit high stretchability and flexibility, good conductive stability, and excellent robustness, enabling the composites to serve as highly stretchable conductors (up to 300% strain), versatile sensors for monitoring both subtle and large human activities, and functional threads for wearable electronics. This novel and efficient methodology provides a new design philosophy for manufacturing not only stretchable conductors and sensors but also other stretchable electronics, such as transistors, generators, artificial muscles, etc.