Low-slip, corrosion-resistant double-layer spacer fabric biopotential dry electrodes for ECG surface monitoring

During dynamic measurements, single-layer fabric biopotential dry electrodes are prone to slip between the electrode and the skin, resulting in more measurement noise. The double-layer structure of the spacer fabric (SF) reduces the relative slip between the bottom of the electrodes and the skin, and obtains better signal quality. In this study, low-slip, corrosion-resistant ECG signal acquisition electrodes based on double-layer SF were developed by silver plating, chlorination and thiol treatment processes. The effects of electrode structure, chlorination time and thiol treatment time on electrode performance were investigated. Compared with the single-layer fabric, the slip at the bottom of the double-layer SF was reduced by 84.6 % at a pressure of 70 cN and a motion displacement of 10 mm. The corrosion inhibition efficiency of the electrode after the thiol-etching treatment was 70.8 %, and a stable ECG signal could still be obtained after etching with sodium sulfide solution.