材料科学
标度系数
导电体
可穿戴计算机
耐久性
可穿戴技术
纤维
应变计
功率(物理)
拉伤
光电子学
复合材料
计算机科学
制作
嵌入式系统
医学
替代医学
物理
病理
量子力学
内科学
作者
Won Kyung Min,Chihyeong Won,Dong Hyun Kim,Sanghyeon Lee,Jusung Chung,Sungjoon Cho,Taeyoon Lee,Hyun Jae Kim
标识
DOI:10.1002/adma.202303556
摘要
Abstract Recently, one of the primary concerns in e‐textile‐based healthcare monitoring systems for chronic illness patients has been reducing wasted power consumption, as the system should be always‐on to capture diverse biochemical and physiological characteristics. However, the general conductive fibers, a major component of the existing wearable monitoring systems, have a positive gauge‐factor (GF) that increases electrical resistance when stretched, so that the systems have no choice but to consume power continuously. Herein, a twisted conductive‐fiber‐based negatively responsive switch‐type (NRS) strain‐sensor with an extremely high negative GF (resistance change ratio ≈ 3.9 × 10 8 ) that can significantly increase its conductivity from insulating to conducting properties is developed. To this end, a precision cracking technology is devised, which could induce a difference in the Young's modulus of the encapsulated layer on the fiber through selective ultraviolet‐irradiation treatment. Owing to this technology, the NRS strain‐sensors can allow for effective regulation of the mutual contact resistance under tensile strain while maintaining superior durability for over 5000 stretching cycles. For further practical demonstrations, three healthcare monitoring systems (E‐fitness pants, smart‐masks, and posture correction T‐shirts) with near‐zero standby power are also developed, which opens up advancements in electronic textiles by expanding the utilization range of fiber strain‐sensors.
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