Department of Electrical and Electronics Engineering, Chung-Ang University, Seoul 06974, Korea.
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Korea.
Sensors (Basel). 2020 Nov 18;20(22):6588. doi: 10.3390/s20226588.
For wearable health monitoring systems and soft robotics, stretchable/flexible pressure sensors have continuously drawn attention owing to a wide range of potential applications such as the detection of human physiological and activity signals, and electronic skin (e-skin). Here, we demonstrated a highly stretchable pressure sensor using silver nanowires (AgNWs) and photo-patternable polyurethane acrylate (PUA). In particular, the characteristics of the pressure sensors could be moderately controlled through a micro-patterned hole structure in the PUA spacer and size-designs of the patterned hole area. With the structural-tuning strategies, adequate control of the site-specific sensitivity in the range of 4783 kPa and in the sensing range from 0.1 to 20 kPa was achieved. Moreover, stacked AgNW/PUA/AgNW (APA) structural designed pressure sensors with mixed hole sizes of 10/200 µm and spacer thickness of 800 µm exhibited high sensitivity (171.5 kPa) in the pressure sensing range of 020 kPa, fast response (100110 ms), and high stretchability (40%). From the results, we envision that the effective structural-tuning strategy capable of controlling the sensing properties of the APA pressure sensor would be employed in a large-area stretchable pressure sensor system, which needs site-specific sensing properties, providing monolithic implementation by simply arranging appropriate micro-patterned hole architectures.
对于可穿戴健康监测系统和软机器人，可拉伸/柔性压力传感器由于其广泛的潜在应用，如人体生理和活动信号的检测以及电子皮肤（e-skin），一直受到关注。在这里，我们使用银纳米线（AgNWs）和光可图案化的聚氨酯丙烯酸酯（PUA）展示了一种高可拉伸压力传感器。特别是，通过 PUA 间隔物中的微图案化孔结构和图案化孔区域的尺寸设计，可以适度控制压力传感器的特性。通过结构调整策略，可以在 4783 kPa 的范围内对特定位置的灵敏度进行适当控制，在 0.120 kPa 的传感范围内也可以实现这一效果。此外，堆叠的 AgNW/PUA/AgNW（APA）结构设计的压力传感器，具有 10/200 µm 的混合孔尺寸和 800 µm 的间隔物厚度，在 020 kPa 的压力传感范围内表现出高灵敏度（171.5 kPa）、快速响应（100~110 ms）和高拉伸性（40%）。从结果可以看出，我们设想的有效结构调整策略能够控制 APA 压力传感器的传感特性，将应用于需要特定位置传感特性的大面积可拉伸压力传感器系统中，通过简单地布置适当的微图案化孔结构，可以实现单片式实现。
