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However, their widespread deployment is limited by the high economic and environmental costs of gold\u2010based conductors and the single\u2010use nature of ultrathin devices. To address these challenges, a cost\u2010effective, silver\u2010based ultrathin stretchable electrode is developed by systematically tuning the mechanical stiffness and chemical polarity of polymeric substrates. Through a deep investigation into the silver embedment mechanism and crack evolution dynamics under stretch, we established the critical structure\u2010property relationships governing electromechanical performance. This yielded an optimized ultrathin stretchable electrode (7.6\u00a0\u00b5m) with a skin\u2010mimetic modulus (1.35 \u00b1 0.03\u00a0MPa), low sheet resistance (9.26 \u03a9\/sq), and robust cyclic stability (resistance change of \u223c1.7 after 5000 cycles). The resulting device achieves conformal skin contact, enabling low\u2010artifact ECG monitoring over 24 h. Furthermore, integrating a robust adhesive ion\u2010gel interface allows the electrode to effectively suppress motion artefacts during vigorous physical activity. It sustains a high signal\u2010to\u2010noise ratio (SNR) of 29.27 \u00b1 1.24\u00a0dB during 13\u00a0km\/h running, significantly outperforming commercial Ag\/AgCl electrodes that exhibit severe motion artifacts. This strategy, merging cost\u2010effective manufacturing with superior dynamic signal fidelity, provides a scalable and practical paradigm for ubiquitous low\u2010cost health monitoring systems.<\/jats:p>","DOI":"10.1002\/smll.76175","type":"journal-article","created":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T12:56:01Z","timestamp":1791550561000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Cost\u2010Effective Ultrathin SEBS\u2010Ag Electrodes of Substrate\u2010Regulated Microcracks for Robust Skin Electrophysiology"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-2548-5479","authenticated-orcid":false,"given":"Jintong","family":"Ai","sequence":"first","affiliation":[{"name":"Sauvage Laboratory for Smart Materials School of Integrated Circuits Harbin Institute of Technology (Shenzhen)  Shenzhen 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