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Claw-shaped flexible and low-impedance conductive polymer electrodes for EEG recordings: Anemone dry electrode

Science China(Technological Sciences) 2023年第1期66卷 255-266页

作者： SHI ZhongYan JIANG Bo LIANG ShiChao ZHANG JiangTao SUO DingJie WU JingLong CHEN DuanDuan PEI GuangYing YAN TianYi School of Life Science Bejing Institute of TechnologyBejing 100081China School of Medical Technology Beijing Institute of Technology Bejing 100081China

Electroencephalogram(EEG) signals provide important brain information in healthcare settings. Wet electrodes have several limitations, including their time-consuming preparation and no long-term acquisition, and dry electrodes have become a promising candidate. However, dry electrodes face several challenges related to signal quality, comfort, conductivity and cost.This study aims to develop and evaluate a novel dry electrode for EEG recordings. The electrode material properties are characterized by electrochemical, mechanical force, and skin measurements. The electrode performance is evaluated by comparing the impedance, signal-to-noise ratio(SNR), and EEG signal features of the proposed electrode with those of a wet electrode and two commercial dry electrodes. The dry electrode design is based on the biological structure of the sea anemone and demonstrates an improved scalp fit and reduced signal noise and motion artifacts. The electrode materials include advanced conducting polymers combined with thermoplastic elastomers(TPEs) and carbon nanotubes(CNTs), which exhibit good electrical conductivity, mechanical properties, and safety. A low-cost injection molding fabrication method is proposed. The dry electrodes show a scalp contact impedance of 7 kΩ at 20 Hz, which is lower than that of wet and commercial dry electrodes.Resting-state EEG and event-related potential signals collected by the anemone dry electrode achieved more than 90% similarity with signals acquired by wet electrodes. Thus, a low-cost, comfortable anemone dry electrode that exhibits excellent EEG recording performance is presented. The anemone dry electrode represents an important technological advance in material and structural design for EEG recording sensors.

关键词： dry electrodes electroencephalogram(EEG) ultra-conductive polymer scalp simulation flexible and low-impedance

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