Fiber‐based strain sensors are considered to be an important part of smart wearables due to their flexible performance, lightness, and easily processing into various structures. However, the low sensitivity of fiber‐based strain sensors has limited their real‐life applications for detecting human movements. In this work, a poly(styrene‐butadiene‐styrene) (SBS)/multi‐walled carbon nanotube (MWCNTs) core–sheath fiber (SSCCSF) strain sensor is fabricated via a simple and facile coaxial wet‐spinning method. The cross‐sectional morphology, the mechanical properties, and the electromechanical performance of the SSCCSFs are investigated. Scanning electron microcopy results show that SSCCSFs have a bean‐like cross‐section with SBS as the core and SBS/MWCNTs as the sheath. Electromechanical performance evaluation confirms that the SSCCSF show a high sensitivity in a broad working range (gauge factor = 25832.77 at 41.5% strain) and excellent durability (5000 cycles at 10% strain). Furthermore, the SSCCSF displays outstanding sensing performance for detecting large motions in human movements including hand joint bending (such as knuckles and wrists) and subtle motions in physiological activities, involved in swallowing behavior, breathing, and pulse beat. This study demonstrates the potential application of SSCCSFs for wearable electronics with activity monitoring sensors.

中文翻译：

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基于芯鞘纤维的可穿戴式应变传感器，具有高拉伸性和灵敏度，可检测人体运动

基于光纤的应变传感器由于其灵活的性能，轻巧的特性以及易于加工成各种结构的特性，被认为是智能可穿戴设备的重要组成部分。但是，基于光纤的应变传感器的低灵敏度限制了其在现实中用于检测人体运动的应用。在这项工作中，通过一种简单，方便的同轴湿纺方法制造了聚（苯乙烯-丁二烯-苯乙烯）（SBS）/多壁碳纳米管（MWCNTs）芯鞘纤维（SSCCSF）应变传感器。研究了SSCCSFs的横截面形态，力学性能和机电性能。扫描电子显微镜结果表明，SSCCSFs的横截面呈豆形，以SBS为核心，SBS / MWCNT为鞘。机电性能评估证实，SSCCSF在较宽的工作范围内（41.5％应变时的应变系数= 25832.77）显示出高灵敏度，并具有出色的耐用性（在10％应变时具有5000个循环）。此外，SSCCSF具有出色的感测性能，可检测人体运动中的大动作，包括手关节弯曲（如指关节和腕部）和生理活动中的细微动作，这些动作涉及吞咽行为，呼吸和搏动。这项研究证明了SSCCSF在具有活动监测传感器的可穿戴电子产品中的潜在应用。SSCCSF具有出色的传感性能，可检测人体运动中的大动作，包括手关节弯曲（如指关节和腕部）和生理活动中的微妙动作，这些动作涉及吞咽行为，呼吸和搏动。这项研究证明了SSCCSF在具有活动监测传感器的可穿戴电子产品中的潜在应用。SSCCSF具有出色的传感性能，可检测人体运动中的大动作，包括手关节弯曲（如指关节和腕部）和生理活动中的微妙动作，这些动作涉及吞咽行为，呼吸和搏动。这项研究证明了SSCCSF在具有活动监测传感器的可穿戴电子产品中的潜在应用。