CB/PVDF干式柔性生物电势电极的制备及性能研究

Preparation and performance study of CB/PVDF dry flexible bioelectric potential electrode

干式柔性生物电势电极不需要导电介质就能与皮肤表面直接贴合进行生物电检测,且能避免凝胶电极失水造成的信号质量降低等问题,可以完美地替代传统湿电极进行人体健康监护。本研究将炭黑(CB)和聚偏氟乙烯(PVDF)进行复合,制备了CB/PVDF柔性电极,电阻率最低可达0.3Ω·cm。研究了CB含量对极化电位的影响,发现CB含量为35%(质量分数)的电极的极化电位最为稳定。对人体进行生物电采集,所得心电信号稳定,能够清晰地辨别P波、QRS波群以及T波等心电特征信号,且信号质量优于失水后的银/氯化银凝胶电极,表明CB/PVDF干式柔性生物电势电极可以替代银/氯化银凝胶电极,用于长期人体生物电信号监测。

The dry flexible bioelectric potential electrode can be directly fitted to the skin surface without conducting medium for bioelectric detection and avoid signal quality degradation caused by water loss of gel electrode,so it can perfectly replace the traditional wet electrode for human health monitoring.In this research,CB/PVDF flexible electrode is prepared with carbon black(CB)and poly(vinylidene fluoride)(PVDF)composite,whose resistivity minimum is 0.3Ω·cm.The influence of CB content on polarization potential is studied,and it is found that the electrode with CB content of 35 wt%has the most stable polarization potential.Collection of bioelectricity to human body shows that the ECG signal is stable and able to clearly distinguish between P wave,QRS complex and T wave characteristics of ECG signals,and the signal quality is better than Ag/AgCl gel electrode after filtration.CB/PVDF dry type flexible biopotential can replace Ag/AgCl gel electrode,and be used the biological electrical signal monitoring for a long time.