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 

机构地区：[1]School of Life Science,Bejing Institute of Technology,Bejing 100081,China [2]School of Medical Technology Beijing Institute of Technology,Bejing 100081,China

出　　处：《Science China(Technological Sciences)》2023年第1期255-266,共12页中国科学（技术科学英文版）

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

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.

关 键 词：dry electrodes electroencephalogram(EEG) ultra-conductive polymer scalp simulation flexible and low-impedance 

分 类 号：TN40[电子电信—微电子学与固体电子学]