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Hierarchically Structured Self-Healing Sensors with Tunable Positive/Negative Piezoresistivity

机译：具有可调正/负压阻的分层结构自愈传感器

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摘要

It is a challenge to manufacture flexible sensors that possess easily distinguishable biomotion signals, strong response reliability, and excellent self-healing capability. Herein, a self-healing sensor with tunable positiveegative piezoresistivity is designed by the construction of hierarchical structure connected through supramolecular metal-ligand coordination bonds. The developed sensors can be integrated with the human body to detect multiple tiny signals, such as pronunciation, coughing, and deep breathing. Interestingly, the nanostructured elastomer sensor with and without a flexible yarn electrode shows negative and positive current signals, respectively, making it easy to be identify. Furthermore, it exhibits very fast (2 min), autonomous, and repeatable self-healing ability with high-healing efficiency (88.6% after the third healing process). The healed samples still possess flexibility, high sensitivity, and accurate detection capability, even after bending over 10 000 cycles. The excellent biomimetic self-healing performance combined with the tunable piezoresistivity make it promising for next-generation wearable electronics.
机译：制造具有易于区分的生物运动信号，强大的响应可靠性和出色的自愈能力的柔性传感器是一个挑战。在此，通过构造通过超分子金属-配体配位键连接的分级结构，设计了具有可调正/负压阻的自愈传感器。先进的传感器可以与人体集成在一起，以检测多个微小信号，例如发音，咳嗽和深呼吸。有趣的是，带有和不带有柔性纱线电极的纳米结构弹性体传感器分别显示负电流信号和正电流信号，因此易于识别。此外，它表现出非常快的（2分钟），自主的和可重复的自我修复能力，并且具有很高的修复效率（第三次修复过程后为88.6％）。修复的样品即使弯曲超过1万次循环后仍具有灵活性，高灵敏度和准确的检测能力。出色的仿生自我修复性能以及可调节的压阻性使其成为下一代可穿戴电子产品的有希望的。

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