High-repeatability macro-porous sponge piezoresistive pressure sensor with polydopamine/polypyrrole composite coating ba
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High‑repeatability macro‑porous sponge piezoresistive pressure sensor with polydopamine/polypyrrole composite coating based on in situ polymerization method Dilini S. W. Gunasekara1 · Yin He1,3,4 · Shu Fang1 · Liduan Zhao1 · Hao Liu1,3,4 · Li Liu2 Received: 30 April 2020 / Accepted: 31 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract 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. Keywords Poly-dopamine · Poly-pyrrole · Piezoresistive sensor · Macro-porous sponge · In situ polymerization
1 Introduction In recent years, flexible piezoresistive sensor with high sensitivity, high stability and wide pressure detection range, have been used as the core device of intelligent wearable Dilini S. W. Gunasekara and Yin He contributed equally to this work. * Hao Liu [email protected] * Li Liu [email protected] 1
School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
2
Beijing Institute of Fashion Technology, Beijing 100029, China
3
Institute of Smart Wearable Electronic Textiles, Tiangong University, Tianjin 300387, China
4
Key Laboratory of Advanced Textile Composite Materials, Ministry of Education of China, Tianjin 300387, China
systems. These devices have a huge application potential in such fields as medical detection and treatment, sports and fitness, lifestyle and entertainment and so on [1, 2]. Conducting polymers, due to their excellent physical and chemical properties, are preferred for sensitive materials with piezoresistive properties [3–5]. Under compressive stress, the contact between conductive particles becomes closer, forming new conductive paths [6]. Subsequently, upon re
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