Abstract Flexible strain sensors have exhibited emerging prospects in bioelectronics due to the ubiquitous health-related strain in biosystems. However, most of the existing flexible strain sensors are plagued by their sensitivity and sensing range trade-off. In this study, we designed a microstructured MXene/polyurethane fibrous membrane (m-MXene FM) with porous network structure and tunable micropatterns (including microcracks and microwrinkles), and demonstrated its superior strain sensing properties. The microcracks can serve as stable mechanical weak points to enhance the sensitivity, while the highly porous network as well as the microwrinkle patterns can buffer the strain loading on individual fibers under large deformations, thus offering wide sensing range. The as-prepared m-MXene FM is highly stretchable and conductive and shows extremely high gauge factor of 1000 and wide sensing range up to 120%. Furthermore, both the sensitivity and sensing range can be facilely tailored through adjusting the micropatterns. This work provides a scalable strategy to fabricate highly sensitive strain sensors with customizable sensing properties suitable for a range of applications in health monitoring.

中文翻译：

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用于具有超宽和可调传感范围的高灵敏度应变传感的微结构 MXene/聚氨酯纤维膜

摘要 由于生物系统中无处不在的与健康相关的应变，柔性应变传感器在生物电子学中展现出新兴的前景。然而，大多数现有的柔性应变传感器都受到其灵敏度和传感范围权衡的困扰。在这项研究中，我们设计了一种具有多孔网络结构和可调微图案（包括微裂纹和微皱纹）的微结构 MXene/聚氨酯纤维膜（m-MXene FM），并展示了其优越的应变传感性能。微裂纹可以作为稳定的机械薄弱点来提高灵敏度，而高度多孔的网络以及微皱图案可以缓冲大变形下单根纤维上的应变载荷，从而提供宽广的传感范围。所制备的 m-MXene FM 具有高度可拉伸性和导电性，并显示出 1000 的极高应变系数和高达 120% 的宽传感范围。此外，灵敏度和感应范围都可以通过调整微图案轻松定制。这项工作提供了一种可扩展的策略来制造具有可定制传感特性的高灵敏度应变传感器，适用于健康监测的一系列应用。