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Additionally, realizing high\u2010performance Ag\u2010based substrates faces a fundamental trade\u2010off between chemical stability and surface activity. To simultaneously resolve these geometric and chemical limitations, we present a stepwise interfacial engineering strategy to synthesize 3D hierarchical dual\u2010layer porous@smooth Au\u2010shelled Ag nanowires. This architecture decouples functional requirements: A hermetic smooth Au inner shell passivates the Ag core for long\u2010term stability, while the nanowire body serves as a structural scaffold for a porous Au outer shell. This design activates the entire 1D surface, creating a volumetric distribution of high\u2010density hotspots localized at the interparticle gaps. Consequently, the hierarchical nanowires exhibit exceptional sensitivity for model analytes, including malachite green, crystal violet, and methylene blue, with detection limits ranging from 10\n                    <jats:sup>\u221211<\/jats:sup>\n                    down to 10\n                    <jats:sup>\u221214<\/jats:sup>\n                    \u2009M. Notably, for malachite green the sensitivity approaches the single\u2010molecule regime. Finally, leveraging their high aspect ratio and mechanical flexibility, the nanowires demonstrate versatile utility in two distinct applications: enabling both stretchable SERS substrates for conformal sensing and colloidal dispersions for the rapid \u201cmix\u2010and\u2010measure\u201d fingerprinting of microplastics (PE, PP, PS, and PET).\n                  <\/jats:p>","DOI":"10.1002\/smsc.70401","type":"journal-article","created":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T05:52:28Z","timestamp":1789624348000},"source":"Crossref","is-referenced-by-count":0,"title":["Interfacial Engineering of Dual\u2010Layer Au\u2010Shelled Ag Nanowires: Decoupling Chemical Stability From Ultrasensitive Surface\u2010Enhanced Raman Spectroscopy Activity"],"prefix":"10.1002","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6774-5320","authenticated-orcid":false,"given":"Yuyang","family":"Li","sequence":"first","affiliation":[{"name":"Laboratory of Organic Electronics Department 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