Characterizing the Impedance Properties of Dry E-Textile Electrodes Based on Contact Force and Perspiration

Author:

Ravichandran Vignesh1ORCID,Ciesielska-Wrobel Izabela2ORCID,Rumon Md Abdullah al1ORCID,Solanki Dhaval1,Mankodiya Kunal1ORCID

Affiliation:

1. Department of Electrical, Computer and Biomedical Engineering, University of Rhode Island, Kingston, RI 02881, USA

2. Department of Textiles, Fashion Merchandising and Design, University of Rhode Island, Kingston, RI 02881, USA

Abstract

Biopotential electrodes play an integral role within smart wearables and clothing in capturing vital signals like electrocardiogram (ECG), electromyogram (EMG), and electroencephalogram (EEG). This study focuses on dry e-textile electrodes (E1–E6) and a laser-cut knit electrode (E7), to assess their impedance characteristics under varying contact forces and moisture conditions. Synthetic perspiration was applied using a moisture management tester and impedance was measured before and after exposure, followed by a 24 h controlled drying period. Concurrently, the signal-to-noise ratio (SNR) of the dry electrode was evaluated during ECG data collection on a healthy participant. Our findings revealed that, prior to moisture exposure, the impedance of electrodes E7, E5, and E2 was below 200 ohm, dropping to below 120 ohm post-exposure. Embroidered electrodes E6 and E4 exhibited an over 25% decrease in mean impedance after moisture exposure, indicating the impact of stitch design and moisture on impedance. Following the controlled drying, certain electrodes (E1, E2, E3, and E4) experienced an over 30% increase in mean impedance. Overall, knit electrode E7, and embroidered electrodes E2 and E6, demonstrated superior performance in terms of impedance, moisture retention, and ECG signal quality, revealing promising avenues for future biopotential electrode designs.

Funder

National Science Foundation

Publisher

MDPI AG

Subject

Clinical Biochemistry,General Medicine,Analytical Chemistry,Biotechnology,Instrumentation,Biomedical Engineering,Engineering (miscellaneous)

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