Printed liquid-metal electrodes track motion and heart signals

A printed flexible electrode combining the GaInSn liquid-metal alloy with copper powder achieved a reported signal-to-noise ratio of 19.5 dB while monitoring electrocardiograms during movement. This was a materials study, not a clinical trial, and the supplied evidence does not specify the number or characteristics of the human participants. The researchers developed the electrodes using a low-cost printing method that combines liquid metal with mixed metal particles.

Copper powder was incorporated into the GaInSn mixture, and the resulting electrodes were designed to adapt to deformation of the skin while remaining comfortable to wear. The study abstract reports that the flexible composite maintained good mechanical stability and a high signal-to-noise ratio. Mechanical testing assessed the stability of the electrode’s resistance response during repeated stretching.

At 10% strain, the fluctuation in the relative resistance change rate was 1.5% after 500 tensile cycles. This measurement indicates that the composite retained a comparatively consistent electromechanical response under the tested deformation conditions. The cycle test does not by itself establish lifetime durability, and the reported result applies specifically to the tested strain and loading protocol rather than to unrestricted use over an extended period.

Electrocardiogram monitoring was evaluated while the wearer sat still, squatted, stood and walked. The electrodes successfully monitored ECG status during these activities, showing that cardiac monitoring continued across several forms of body movement. Together, the results support the use of printed GaInSn–copper composites as adaptable electrodes for wearable sensing.

The measured 19.5 dB signal-to-noise ratio, the limited fluctuation after 500 stretching cycles and ECG monitoring during four activities form the principal experimental evidence. The available information does not establish diagnostic accuracy, equivalence to clinical ECG equipment, performance in a broad patient population or safety for long-term skin contact. Nor does it report results from cohort testing, comparisons with established electrodes, or assessments of factors such as sweating and prolonged unrestricted activity.

The work therefore demonstrates a promising materials platform under the reported laboratory conditions, while broader validation of sustained real-world use remains outside the evidence presented in the abstract.

Subject of Research: Printed GaInSn–copper flexible electrodes for wearable motion and electrocardiogram monitoring

Article Title: Liquid GaInSn alloy with copper powder composite flexible electrodes for monitoring body motion and electrocardiograms

Article References: Gao, J., Shao, N., Wei, L., Lin, J., Wang, H., Zhang, H., & Qin, H. (2026). Liquid GaInSn alloy with copper powder composite flexible electrodes for monitoring body motion and electrocardiograms. Journal of Materials Science, 61(40), 30904-30915. https://doi.org/10.1007/s10853-026-13622-x

Image Credits: AI Generated

DOI: 10.1007/s10853-026-13622-x

Keywords: GaInSn, liquid metal, copper composite, flexible electrodes, electrocardiography, wearable sensors, body-motion monitoring, printed electronics, Liquid, alloy, copper, powder