银-氯化银柔性脑电电极的制备及其评价  

Preparation and Evaluation of Flexible Silver-Silver Chloride EEG Electrodes

作　　者：秦路丹 李明哲[1] 李广利[1] 段晏文[1] 

机构地区：[1]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《分析科学学报》2016年第4期445-450,共6页Journal of Analytical Science

基　　金："十二五"国家科技支撑项目(No.2012BAI16B02)

摘　　要：本文采用丝网印刷技术制备了一种基于聚酰亚胺(PI)柔性塑料基片的Ag/AgCl脑电电极,并建立了一套系统评价柔性脑电电极性能的方法。评价方法主要包括扫描电镜(SEM)表征、电极电位/时间响应和稳定性测试、电化学阻抗测试、附着性测试。结果表明,该柔性电极表面为多孔结构,且与基底粘附性好;该电极呈现Ag/AgCl的电化学界面性质,其平衡电位为0.97±0.20mV,与Ag/AgCl粉末电极接近;且电极电位一致性和稳定性良好,最大极差电位不超过0.7mV,4h后电位漂移值在10μV/4min以内;经磨砂导电膏GT5处理后,电极-皮肤阻抗在5kΩ以内,满足脑电记录要求;相对于人体皮肤的高阻抗值,柔性电极-导电膏(GT20)的界面阻抗仅为166Ω·cm2。该评价方法系统、实用,可为制定相应国家标准提供技术参考。A PI-based flexible silver/silver chloride （Ag/AgCl） electrode has been developed by using screen printing technique, and a systemic method has also been established to evaluate the electrode performance. The flexible electrodes surface show porous structure and good adhesion. The electrodes presented typical Ag/AgCl dectrochemical interfacial properties,with the equilibrium potential of 0.97±0.20 mV,which was close to that of sintered Ag/AgCl reference electrode. Furthermore, the electrodes also exhibited good consistency and stability of electrode potential. The maximum potential variation did not exceed 0.7 mV and the shifting potential was less than 10 μV/4min after 4 h stabilization. Besides, the electrode-skin impedance was less than 5 kΩ after skin prepared with GT5 conductive gel,which met the requirements of EEG recording. Compared with the skin of high impedance, the electrode-conductive paste（GT20） interface impedance （166 Ω·cm^2） can be ignored. The proposed evaluation method is systemic and practical, supporting the development of new flexible EEG electrodes and providing the technical reference for corresponding national standards.

关 键 词：柔性脑电电极 电极-皮肤阻抗 脑电 生物电位测量 可穿戴设备 

分 类 号：O657.1[理学—分析化学]