Innovation Center for Textile Science and Technology , Donghua University , Shanghai 200051 , China.
ACS Appl Mater Interfaces. 2020 Jan 8;12(1):1597-1605. doi: 10.1021/acsami.9b19238. Epub 2019 Dec 27.
Nowadays, real-time human motion sensing and pulse monitoring can provide significant basis for health assessment and medical diagnosis. Nevertheless, it is still a big challenge to design a lightweight, flexible, and energy-sustainable pressure sensor with high sensitivity and breathability. Here, we fabricated a triboelectric all-fiber structured pressure sensor via a facile electrospinning technique. The constructed sensor textile holds a composite structure made up of a polyvinylidene fluoride/Ag nanowire nanofibrous membrane (NFM), an ethyl cellulose NFM, and two layers of conductive fabrics. This wearable device with high shape adaptability exhibited excellent sensing capability because of the introduced hierarchically rough structure on the nanofibers. The sensitivity can reach up to 1.67 and 0.20 V·kPa in the pressure range of 0-3 and 3-32 kPa, respectively. The fabricated sensor textile also showed a superior mechanical stability even after continuous operation of 7200 working cycles. This sensor textile was easily conformable on different desired body parts for dynamic motion sensing and real-time pulse monitoring. It can work in a self-powered manner to detect and quantify various human motions associated with joints, such as elbows, knees, and ankles. Additionally, it can be placed on the carotid artery to capture the pulse signals, serving as a reliable way to reflect the state of health. This work has great possibilities to promote the rapid advancement and broad applications of multifunctional pressure sensors and next-generation wearable electronics.
如今，实时人体运动感应和脉搏监测可为健康评估和医学诊断提供重要依据。然而，设计具有高灵敏度和透气性的轻量级、灵活和节能压力传感器仍然是一个巨大的挑战。在这里，我们通过简便的静电纺丝技术制造了一种摩擦电全纤维结构压力传感器。所构建的传感器纺织品具有由聚偏二氟乙烯/Ag 纳米线纳米纤维膜（NFM）、乙基纤维素 NFM 和两层导电织物组成的复合结构。由于在纳米纤维上引入了分层粗糙结构，这种具有高形状适应性的可穿戴设备表现出出色的传感能力。在 0-3 kPa 和 3-32 kPa 的压力范围内，灵敏度分别达到了 1.67 和 0.20 V·kPa。即使经过 7200 个工作循环的连续运行，所制造的传感器纺织品也表现出卓越的机械稳定性。这种传感器纺织品可以轻松贴合在不同需要的身体部位上，用于动态运动感应和实时脉搏监测。它可以以自供电的方式工作，以检测和量化与关节（如肘部、膝盖和脚踝）相关的各种人体运动。此外，它可以放置在颈动脉上以捕获脉搏信号，是反映健康状况的可靠方法。这项工作有可能促进多功能压力传感器和下一代可穿戴电子产品的快速发展和广泛应用。
