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Nevertheless, current plasmonic EHS designs are hindered by high critical discoloration concentrations (CDCs), slow response times, and inconsistent discoloration behavior. Herein, we present a Fabry\u2010P\u00e9rot cavity\u2010type EHS composed of close\u2010packed Au@Pd@oxide core\u2010shell nanoparticles that operates via a hydrogen\u2010induced charge\u2010transfer (HICT) mechanism. Hydrogen exposure reduces of the oxide shell of Au@Pd@oxide and forms Au@Pd, transforming the plasmonic resonance from a gap mode to a charge\u2010transfer mode, resulting in a vivid, reliable color change. This design achieves an ultra\u2010low CDC of 0.1% H\n                    <jats:sub>2<\/jats:sub>\n                    , a rapid response time of 4 s, and robust performance across diverse environmental conditions, surpassing U.S. Department of Energy safety targets. This work establishes HICT as a novel strategy for active plasmon modulation and highlights cavity\u2010engineered plasmonic architectures as promising platforms for next\u2010generation hydrogen safety sensors.\n                  <\/jats:p>","DOI":"10.1002\/advs.77338","type":"journal-article","created":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T15:53:41Z","timestamp":1787846021000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Cavity\u2010Enhanced Eye\u2010Readable Detection of 0.1% H\n                    <sub>2<\/sub>\n                    via Active Modulation of Charge\u2010Transfer Plasmons"],"prefix":"10.1002","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7776-4071","authenticated-orcid":false,"given":"Xuemin","family":"Zhang","sequence":"first","affiliation":[{"name":"Department of Chemistry College of Sciences Northeastern University  Shenyang Liaoning People's Republic of 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