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    Durable conducting polymer electrodes pursue low impedance, antifouling, and electrochemical stress tolerance

    Year: 2023

    Authors: Bian, Yongjun; Pan, Qichao; Zhu, Yicheng; Liang, Jia; Zhang, Yuhan; Zhang, Yaqiong; Zhang, Shouyan; Qian, Sihao; Geng, Zhi; You, Zhengwei; Cieplak, Maciej; Sharma, Piyush S.; Zhang, Yaopeng; He, Yong; Zhu, Bo

    Keywords: 4-ethylenedioxythiophene); Bioelectrode; DOPA; Phosphorylcholine; Poly(3; Zwitterionic

    Conducting polymers are emerging as a very attractive type of electro-materials for bioelectronic devices, owing to their low impedance, high charge injection limit, and small modulus. However, the efforts to create stable and long-lasting conducting polymer electrodes are challenged by biofouling and the physical failure of electrodes. Here, we develop a durable conducting polymer electrode based on EDOT copolymers expressing zwitterionic phosphorylcholine and DOPA moieties, which enable low impedance communication, excellent protein/cell resistance, and long-term stable operation. This antifouling conducting PEDOT electrode shows much enhanced interfacial adhesion with substrates and cohesion in water than all the other tested PEDOT conducting polymers. Its wet lap shear strength with substrates is three times higher than the pristine PEDOT; it can tolerate 20 h of sonication treatment in water, while the three control PEDOT electrodes all start to collapse within minutes. We further find that the antifouling PEDOT can tightly integrate with diverse substrates (Au, ITO, and stainless steel); this strengthening approach works effectively for all the tested three hydrophilic PEDOTs. We finally demonstrate the robustness of the antifouling PEDOT on a homemade electrode array with a not compromised impedance after being electrically stimulated in the physiological environment for 24 h.
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