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

作     者：SHI ZhongYan JIANG Bo LIANG ShiChao ZHANG JiangTao SUO DingJie WU JingLong CHEN DuanDuan PEI GuangYing YAN TianYi 

作者机构：School of Life ScienceBejing Institute of TechnologyBejing 100081China School of Medical Technology Beijing Institute of TechnologyBejing 100081China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2023年第66卷第1期

页      面：255-266页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 0710[理学-生物学] 1002[医学-临床医学] 0809[工学-电子科学与技术（可授工学、理学学位）] 1001[医学-基础医学(可授医学、理学学位)] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. U20A20191  82202291  61727807  and 12104049)。 

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

摘      要：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.