A reversible gel-free electrode for continuous noninvasive electrophysiological signal monitoring

作者：Liu, Qing; Zhou, Jie; Yang, Liangtao^*; Xie, Jiajia; Guo, Chenhui; Li, Zimo; Qi, Jun; Shi, Shuo; Zhang, Zhilin; Yang, Hui; Hu, Jinlian; Wu, Jinglong; Zhang, Yi^*

来源：Journal of Materials Chemistry C, 2023, 11(26): 8866-8875.

DOI：10.1039/d3tc00948c

• PEDOTPSS
• POLYMER
• SOLVENT
• SURFACE

Continuous and accurate acquisition of electrophysiological signals is critical in health monitoring and disease diagnosis. However, degradation of electrophysiological electrodes can occur during long-term and continuous monitoring, leading to poor signal quality. Herein, we report a reversible and continuously monitored gel-free sponge electrode, which was prepared by vacuuming melamine resin sponge (MS) and an aqueous solution consisting of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS), poly(vinyl alcohol) (PVA), and ethylene glycol (EG). The electrode exhibits a low contact impedance of 3.5 k omega and excellent mechanical stability with 10 000 cycles of compression. Additionally, the electrode possesses a long shelf life and the ability to recover its initial electrical performance. Therefore, they enable continuous surface electromyography (sEMG) signal monitoring for 8 hours and have an excellent durability of up to 6 months. The signal-to-noise ratio (SNR) of this gel-free sponge electrode (9.82 dB) is higher than that of the commercial gel electrode (7.92 dB). Finally, we verified that these achieved dry or semi-dry electrodes can accurately detect biopotential signals, including electrocardiogram (ECG), electroencephalogram (EEG), and electrooculogram (EOG). This study provides a pathway to design a reversible, long-lasting, high-quality gel-free electrode for electrophysiological signal monitoring.

• 单位
  中国科学院; y