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However, their widespread adoption is constrained by complex fabrication, insufficient conformability, and suboptimal biocompatibility. Herein, we propose a poly(lipoic acid)\u2010based sprayable electronic tattoo (LS e\u2010tattoo) formulated from lipoic acid (LA), tannic acid (TA), and silver flakes. This strategy uses spray\u2010coating for rapid polymerization, followed by a Zn\n                    <jats:sup>2+<\/jats:sup>\n                    spray for curing. As a result, a conformal, breathable, biocompatible, and robust conductive network forms in situ on the skin within 3 min. The secondary\u2010cured LS e\u2010tattoo exhibits an ultralow contact impedance of 95 k\u03a9 at 50\u00a0Hz. The device also shows less than 1% resistance variation after 1,500 bending cycles, confirming its mechanical robustness. An integrated epidermal sensing system was further developed. This platform enables synchronous sweat chloride detection (12.5\u201370\u00a0mM,\n                    <jats:italic>R<\/jats:italic>\n                    <jats:sup>2<\/jats:sup>\n                    = 0.992). Concurrent measurements include body surface temperature (error &lt; 0.1\u00b0C) and skin hydration (\n                    <jats:italic>R<\/jats:italic>\n                    <jats:sup>2<\/jats:sup>\n                    = 0.998), while high\u2010fidelity electromyography signals (SNR: 14.4\u00a0dB) are acquired simultaneously. By combining in situ conformal integration with rapid on\u2010demand fabrication, this work offers a versatile platform for customized e\u2010skins.\n                  <\/jats:p>","DOI":"10.1002\/smll.75210","type":"journal-article","created":{"date-parts":[[2026,8,13]],"date-time":"2026-08-13T08:45:43Z","timestamp":1786610743000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["An In Situ Assembled, Sprayable Poly(Lipoic Acid) E\u2010Tattoo for Multimodal Health Monitoring"],"prefix":"10.1002","volume":"22","author":[{"given":"Feitong","family":"Ma","sequence":"first","affiliation":[{"name":"State Key Laboratory of Advanced Papermaking and Paper\u2010based Materials School of Light Industry and Engineering South China University of Technology  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruitong","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Papermaking and Paper\u2010based Materials School of Light Industry and Engineering South China University of Technology  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yongye","family":"Chen","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Papermaking and Paper\u2010based Materials School of Light Industry and Engineering South China University of Technology  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiahao","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Papermaking and Paper\u2010based Materials School of Light Industry and Engineering South China University of Technology  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guangliang","family":"Yu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Papermaking and Paper\u2010based Materials School of Light Industry and Engineering South China University of Technology  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoya","family":"An","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Spatial Datum  Zhengzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guangxue","family":"Chen","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Papermaking and Paper\u2010based Materials School of Light Industry and Engineering South China University of Technology  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2053-1813","authenticated-orcid":false,"given":"Junfei","family":"Tian","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Papermaking and Paper\u2010based Materials School of Light Industry and Engineering South China University of Technology  Guangzhou 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