College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, People's Republic of China.
Nanotechnology. 2024 May 23;35(32). doi: 10.1088/1361-6528/ad4158.
Flexible piezoresistive pressure sensors are gaining significant attention, particularly in the realm of flexible wearable electronic skin. Here, a flexible piezoresistive pressure sensor was developed with a broad sensing range and high sensitivity. We achieved this by curing polydimethylsiloxane (PDMS) on sandpaper, creating a PDMS film as the template with a micro-protrusion structure. The core sensing layer was formed using a composite of silver nanowires (AgNWs) and waterborne polyurethane (WPU) with a similar micro-protrusion structure. The sensor stands out with its exceptional sensitivity, showing a value of 1.04 × 10kPawith a wide linear range from 0 to 27 kPa. It also boasts a swift response and recovery time of 160 ms, coupled with a low detection threshold of 17 Pa. Even after undergoing more than 1000 cycles, the sensor continues to deliver stable performance. The flexible piezoresistive pressure sensor based on AgNWs/WPU composite film (AWCF) can detect small pressure changes such as pulse, swallowing, etc, which indicates that the sensor has great application potential in monitoring human movement and flexible wearable electronic skin.
柔性压阻压力传感器备受关注，尤其在柔性可穿戴电子皮肤领域。本研究制备了一种具有宽传感范围和高灵敏度的柔性压阻压力传感器。我们通过在砂纸上层压聚二甲基硅氧烷（PDMS），制得具有微凸起结构的 PDMS 薄膜作为模板。核心传感层由具有类似微凸起结构的银纳米线（AgNWs）和水性聚氨酯（WPU）复合材料构成。该传感器具有出色的灵敏度，在 0 至 27 kPa 的宽线性范围内的灵敏度值为 1.04×10kPaw，响应和恢复时间快，检测阈值低至 17 Pa。即使经过 1000 多次循环后，传感器仍能保持稳定的性能。基于 AgNWs/WPU 复合薄膜（AWCF）的柔性压阻压力传感器可检测到脉搏、吞咽等微小的压力变化，表明该传感器在监测人体运动和柔性可穿戴电子皮肤方面具有巨大的应用潜力。
