Flexible strain sensors with good linear sensitivity, mechanical compatibility with systems and robustness over repeated usages are very desirable in wearable electronics, smart textiles, and other multifunctional structures. To this end, carbon nanotube/polyvinyl alcohol (CNT/PVA) coated yarn with a core-sheath structure (inner pure CNT core and outer CNT-PVA sheath) was fabricated by dipping the aerogel-spun CNT yarn in various PVA solutions for a short period of time. The as-produced CNT/PVA coated yarn has an electrical conductivity of 447.1 S/cm and exhibits a linear piezoresistive response, with a high gauge factor (the ratio of electrical resistance change to strain change) of 2.36. Compared with the pure CNT yarn, the PVA coated yarn has an improved tensile strength by 71.8%, Young’s modulus by 157.3%, abrasion-resistance by 100%, and enhanced stability after cyclic loading. This demonstrates a promising strain sensor for system integration into flexible intelligent devices or other advanced composites.

在穿戴式电子产品，智能纺织品和其他多功能结构中，非常需要具有良好线性灵敏度，与系统的机械兼容性以及在反复使用后具有鲁棒性的柔性应变传感器。为此，通过将气凝胶纺成的CNT纱浸入各种PVA溶液中，制得具有芯鞘结构（内层纯CNT芯和外层CNT-PVA皮）的碳纳米管/聚乙烯醇（CNT / PVA）涂层纱线。时间短。制成的CNT / PVA涂层纱线的电导率为447.1 S / cm，并表现出线性的压阻响应，其高规格系数（电阻变化与应变变化之比）为2.36。与纯CNT纱线相比，PVA涂层纱线的拉伸强度提高了71.8％，杨氏模量提高了157.3％，耐磨性提高了100％，并提高了循环加载后的稳定性。这证明了一种有前途的应变传感器，可以将系统集成到灵活的智能设备或其他先进的复合材料中。