Micro‐Texturized and Ultra‐Soft Dry Electrode for Motion‐Artifact Tolerant and Long‐Term Stable Wearable Electrophysiological Monitoring

ABSTRACT Accurate and robust acquisition of electrophysiological signals is essential for wearable healthcare and human–machine interface applications. However, conventional wet electrodes are limited by motion artifacts and insufficient long‐term stability, while many dry electrodes lack adequate skin adhesion and mechanical compliance. Here, we present a carbon black (CB)–polydimethylsiloxane (PDMS) composite‐based dry electrode featuring a micro‐textured surface (R _a ≈ 1 µm), low modulus (∼216 kPa), and strong adhesive strength (∼15.68 kPa), conformally integrated onto a stretchable metallic interconnector with an optimized serpentine geometry (235° curvature angle). This architecture achieves high performance without fabrication complexity by leveraging spontaneously formed micro‐textures to promote mechanical interlocking for robust skin adhesion, thereby ensuring low interfacial impedance (∼165.2 kΩ·cm ² at 100 Hz) and enabling long‐term electrical and mechanical stability. To demonstrate real‐world applicability, we developed a wireless, miniaturized electrocardiogram (ECG) system integrated with an inertial measurement unit (IMU). The system achieved significantly higher signal‐to‐noise ratios (SNR) than commercial devices across diverse activities (16.82–26.19 dB vs. 4.98–13.8 dB) and maintained an SNR of 21.07 dB after 24 h of continuous monitoring. These results highlight the potential of the proposed electrode system as a scalable and practical solution for high‐fidelity, long‐term biosignal acquisition in wearable electronics.