Liu Yanjiao, Xu Jingjing, Li Yunxia, Nie Yu, Kang Hong, Han Weihua
School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, China.
School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070, China.
Nanoscale. 2025 Aug 15;17(32):18583-18592. doi: 10.1039/d5nr01414j.
Flexible pressure sensors have attracted significant attention as key components of smart wearable devices. Achieving both high sensitivity and a wide mechanical response range remains a major challenge. Here, we present an innovative flexible pressure sensor fabricated using silicon mold impression-transfer and electrospinning technologies. The sensor comprises two main components: a polydimethylsiloxane (PDMS) micro-pyramid array coated with silver nanowires as the electrode layer and a multi-layer porous nanofiber network formed by alternating polyacrylonitrile nanofibers and silver nanowires, serving as the sensing layer. The stepwise deformation of the PDMS micro-pyramidal array and the porous nanofiber network under pressure enables a wide mechanical response range while maintaining high sensitivity. Compared to flat-pattern designs, the micro-pyramid array significantly enhances sensitivity, achieving an ultra-wide detection range of 0-1600 kPa, a fast response time of 40 ms, a recovery time of 70 ms, and excellent durability over 2000 cycles. Furthermore, through Cell Counting Kit-8 (CCK-8) tests and live-dead cell staining experiments, we have verified the good biocompatibility of this novel sensor, providing safety assurance for subsequent applications. This work demonstrates a strategy for developing flexible, light weight, biocompatible, highly sensitive, and wide-range piezoresistive sensors by rationally designing micro-pyramid and multilayer nanofiber structures, demonstrating significant potential for medical applications, including human motion monitoring and bite force detection.
柔性压力传感器作为智能可穿戴设备的关键部件已引起了广泛关注。同时实现高灵敏度和宽机械响应范围仍然是一个重大挑战。在此，我们展示了一种采用硅模压印转移和静电纺丝技术制造的创新型柔性压力传感器。该传感器包括两个主要组件：一个涂有银纳米线作为电极层的聚二甲基硅氧烷（PDMS）微金字塔阵列，以及一个由聚丙烯腈纳米纤维和银纳米线交替形成的多层多孔纳米纤维网络，用作传感层。PDMS微金字塔阵列和多孔纳米纤维网络在压力下的逐步变形能够实现宽机械响应范围，同时保持高灵敏度。与平面图案设计相比，微金字塔阵列显著提高了灵敏度，实现了0 - 1600 kPa的超宽检测范围、40 ms的快速响应时间、70 ms的恢复时间以及超过2000次循环的优异耐久性。此外，通过细胞计数试剂盒 - 8（CCK - 8）测试和活死细胞染色实验，我们验证了这种新型传感器具有良好的生物相容性，为后续应用提供了安全保障。这项工作展示了一种通过合理设计微金字塔和多层纳米纤维结构来开发柔性、轻质、生物相容、高灵敏度和宽范围压阻传感器的策略，在包括人体运动监测和咬力检测在内的医学应用中显示出巨大潜力。
