Electrical impedance performance of metal dry bioelectrode with different surface coatings

Wei Liu, Wei Zhou, Shaoyu Liu, Chenying Zhang, Shuaishuai Huang, Yaoyao Li, Kwan San Hui

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To improve the electrical impedance performance of bioelectrodes, a novel metal dry bioelectrodes with different coating layers are developed with laser micromilling and electroplating technology. Based on the analysis of the coating layer on the bioelectrode surface, the effect of different coating layers on the electrical impedance performance of bioelectrodes is investigated. The results show that the silver content increases with electroplating time when the silver layer is coated on the bioelectrode surface. However, the decrease of silver layer weight is observed with much longer electroplating time, and the optimal electroplating time is 20 min. Compared with the uncoated bioelectrode, the bioelectrode coated with silver layer exhibits much lower impedance value and better impedance stability. Especially, when the silver-coated bioelectrode is subsequently coated with silver-silver chloride layer, the lowest impedance value and best impedance stability are obtained.
Original languageEnglish
Pages (from-to)515–523
JournalSensors and Actuators A: Physical
Early online date6 Dec 2017
Publication statusPublished - 1 Jan 2018


  • Dry bioelectrode
  • Laser micromilling
  • Electroplating technology
  • Silver layer
  • Silver/silver chloride layer

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