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Extending the pressure sensing range of porous polypyrrole with multiscale microstructures.
Nanoscale ( IF 6.7 ) Pub Date : 2020-01-08 , DOI: 10.1039/c9nr08632c
Yunxia Li 1 , Changjun Jiang , Weihua Han
Affiliation  

Polymer-based piezoresistive sensors that combine the flexibility and stretchability of organic polymers have received considerable attention in flexible and wearable sensing systems. Generally, highly sensitive pressure sensors have a limited pressure sensing range, while pressure sensors with a wide pressure response range usually have limited pressure resolution. Herein, we used a polypyrrole (PPy) sponge with multiscale porous structures to extend the pressure sensing range of PPy-based piezoresistive sensors. The multiscale microstructures with different sizes will sink in sequence after increasing the external pressure and therefore exhibit a wide pressure response range. Our results show that the piezoresistive composite has a superior sensitivity of 28 kPa-1 and a broad stress range of 0-60 kPa. Moreover, the composite displays a stable, repeatable and durable performance over 16 000 cycles. It can be used to monitor diverse body part motions, including vocalization, pulse beating and joint bending. This work provides an effective strategy to extend the pressure sensing range of polymer-based piezoresistive sensors in the manner of structure design rather than modifying the intrinsic properties of active materials.

中文翻译:

扩展具有多尺度微结构的多孔聚吡咯的压力感测范围。

结合了有机聚合物的柔韧性和可拉伸性的基于聚合物的压阻传感器在柔性和可穿戴的传感系统中受到了广泛的关注。通常,高灵敏度压力传感器的压力感测范围有限,而压力响应范围较宽的压力传感器的压力分辨率通常有限。本文中,我们使用具有多尺度多孔结构的聚吡咯(PPy)海绵来扩展基于PPy的压阻传感器的压力感应范围。具有不同尺寸的多尺度微结构在增加外部压力后将依次沉没,因此呈现出较宽的压力响应范围。我们的结果表明,压阻复合材料具有28 kPa-1的出色灵敏度和0-60 kPa的宽应力范围。而且,复合材料显示出稳定的 在16000次循环中具有可重复和持久的性能。它可用于监视各种身体部位的运动,包括发声,脉搏跳动和关节弯曲。这项工作提供了一种有效的策略,可以以结构设计的方式扩展聚合物基压阻传感器的压力传感范围,而不是改变活性材料的固有特性。
更新日期:2020-01-08
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