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Wearable strain sensor based on highly conductive carbon nanotube/polyurethane composite fibers

机译：基于高导电碳纳米管/聚氨酯复合纤维的可穿戴应变传感器

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摘要

Highly conductive and stretchable fibers have recently attracted increasing attention owing to their potential for application in flexible wearable electronics. Carboxylated carbon nanotubes (c-CNTs) are coated onto flexible fibers as a convenient way of fabricating wearable strain sensors. However, the conductivity of a c-CNT is reduced due to the destruction of the graphitized structure of the CNT during carboxylation. It still remains a significant challenge to endow c-CNT composite fibers with high conductivity. In this study, highly conductive fibers were prepared by coating metal ion-linked c-CNTs onto polyurethane (PU) fibers in order to improve the electron transport rate between the c-CNTs. The metal-coordination junctions formed by Fe2+ ions and carboxyl significantly enhanced the conductivity of the PU/CNT@Fe2+ fibers (up to 72 S m(-1)). The high conductivity is the result of coordination junctions with strong electronic state coupling facilitating electron transport, which was proved by density functional theory calculations. The resulting coordination effect enhanced the interaction between the c-CNTs, which made the conductive network more flexible. The strain sensor based on PU/CNT@Fe2+ fibers exhibited high sensitivity (gauge factor = 36 at 50% strain), a large strain range, inconspicuous drift and durability. The fibrous strain sensor was successfully used to monitor joint movement and facial expression.
机译：由于其在柔性可佩戴电子产品中的应用可能性，高导电和可伸展的纤维最近引起了越来越多的关注。羧化碳纳米管（C-CNT）涂覆到柔性纤维上，作为制造可佩戴耐磨菌株传感器的方便方式。然而，由于羧化期间CNT的石墨化结构破坏，C-CNT的电导率降低。赋予具有高导电性的C-CNT复合纤维仍然是一个重要的挑战。在该研究中，通过将金属离子连接的C-CNT涂覆到聚氨酯（PU）纤维上来制备高导电纤维，以改善C-CNT之间的电子传输速率。由Fe2 +离子和羧基形成的金属配位结显着增强了PU / CNT @ Fe2 +纤维的电导率（高达72秒（-1））。高导电性是具有强型电子传输的强电子状态耦合的协调结的结果，其通过密度泛函理论计算证明。由此产生的协调效果增强了C-CNT之间的相互作用，这使得导电网络更加灵活。基于PU / CNT @ Fe2 +纤维的应变传感器表现出高灵敏度（仪表因子= 36，50％菌株，应变范围大，漂移不显眼和耐用性。纤维应变传感器成功地用于监测关节运动和面部表情。

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