High-stability piezoresistive sensors are an important part of smart wearable systems. In this study, an in situ polymerization method was used to polymerize a layer of polydopamine (PDA) and poly-pyrrole (PPy) on the surface of the macro-porous sponge (MPS). The deposition of PDA was done using para toluene sulfonic acid (p-TSA), the pH of the solution being used to control the thickness of the PDA, that followed by PPy coating. The thin layer of PDA effects to give better adherent in-between MPS surface and PPy coating. The morphology, chemical composition, and pressure-sensing properties of the fabricated PDA/PPy pressure sensors have been widely investigated. The experimental results show that the PDA/PPy-MPS pressure sensor with the concentration of p-TSA is 0.05 M with PDA coating shows better performance in the pressure range of 1–10 kPa. The pressure sensor performance of PDA (0.05 M p-TSA)/PPy-MPS near 1000 pressure cycles related to average sensitivity, hysteresis, and non-linear errors are 7.20 ± 2.46 kPa−1, 13.51 ± 0.03%, and 3.30 ± 0.59%, respectively. The repeatability error of up and down near conductive signals are reported as 2.70 ± 0.93% and 2.25 ± 0.63%. Its minimum resistance is reported as 9.94 Ω when the pressure increased up to 119 kPa. The developed applications of PDA/PPy-MPS show promising ability to use as a pressure sensor and switching element in smart wearable devices.

中文翻译：

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基于原位聚合法的聚多巴胺/聚吡咯复合涂层高重复性大孔海绵压阻式压力传感器

高稳定性压阻传感器是智能可穿戴系统的重要组成部分。在本研究中，采用原位聚合方法在大孔海绵 (MPS) 表面聚合了一层聚多巴胺 (PDA) 和聚吡咯 (PPy)。PDA 的沉积是使用对甲苯磺酸 (p-TSA) 完成的，溶液的 pH 值用于控制 PDA 的厚度，然后是 PPy 涂层。PDA 薄层的作用是在 MPS 表面和 PPy 涂层之间提供更好的附着力。制备的 PDA/PPy 压力传感器的形态、化学成分和压力传感特性已得到广泛研究。实验结果表明，p-TSA 浓度为 0.05 M 的 PDA/PPy-MPS 压力传感器在 1-10 kPa 的压力范围内表现出更好的性能。PDA (0.05 M p-TSA)/PPy-MPS 的压力传感器性能在接近 1000 个压力循环时与平均灵敏度、滞后和非线性误差相关，分别为 7.20 ± 2.46 kPa-1、13.51 ± 0.03% 和 3.30 ± 0.59 ％， 分别。导电信号附近上下的重复性误差报告为 2.70 ± 0.93% 和 2.25 ± 0.63%。当压力增加到 119 kPa 时，其最小电阻报告为 9.94 Ω。PDA/PPy-MPS 的开发应用显示出在智能可穿戴设备中用作压力传感器和开关元件的潜力。导电信号附近上下的重复性误差报告为 2.70 ± 0.93% 和 2.25 ± 0.63%。当压力增加到 119 kPa 时，其最小电阻报告为 9.94 Ω。PDA/PPy-MPS 的开发应用显示出在智能可穿戴设备中用作压力传感器和开关元件的潜力。导电信号附近上下的重复性误差报告为 2.70 ± 0.93% 和 2.25 ± 0.63%。当压力增加到 119 kPa 时，其最小电阻报告为 9.94 Ω。PDA/PPy-MPS 的开发应用显示出在智能可穿戴设备中用作压力传感器和开关元件的潜力。