The effect of chlorine/argentum atomic ratios on electrochemical behaviors and signal acquisition abilities of embroidered electrodes for bio-potential signal measurement
Bio-potential dry electrode is an important part of smart garments or wearable devices for monitoring bio-potential signals. In this work, embroidered electrodes are developed by embroidering silver-plated yarns in woven fabric. Then, AgCl is electrochemically deposited on silver-plated yarns in the embroidered electrode, and the chlorine/argentum (Cl/Ag) atomic ratios can be adjusted by the chlorination time. Moreover, a novel active evaluation system of wearable bio-potential electrodes developed by our group is utilized to evaluate the performance of the embroidered electrodes, and two novel indexes (bio-potential phase shift and voltage amplitude attenuation) were presented for evaluating the performance of embroidered electrodes. Results show that the chlorination of silver-plated yarns can improve the performance of embroidered electrodes. The electrochemical behaviors and signal acquisition abilities of the embroidered electrodes can be affected by Cl/Ag atomic ratios. The embroidered electrodes with the Cl/Ag atomic ratios of 62% (E-90) have the lowest impedance (3364 ± 894 O), and their static open-circuit potential and dynamic open-circuit potential variation are all less than 7 mV. During the standard ECG signal test, E-90 shows the minimum bio-potential phase shift (0.011 s), voltage amplitude attenuation (11.768%), noise amplitude (0.025 mV), and maximum signal to noise (41 dB). The noise amplitude of human body ECG of E-90 is also the lowest (0.013 mV) and signal to noise is the maximum (40.996 dB). The embroidered electrodes have broad application prospects in long-term health-monitoring system.
This work received the financial support of the National Natural Science Foundation of China (Grant No. 51473122), Postdoctoral Science Foundation of China (Grant No. 2016M591390), and the Natural Science Foundation of Tianjin (Grant No. 18JCYBJC18500).
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Conflict of interest
The authors declare no conflicts of interest.
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