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However, accelerated surface oxidation of zero\u2010valent bismuth suppresses photoinduced charge transfer, limiting its practical application. Here we introduce metallic bismuth core\u2010shell nanoparticles produced by femtosecond laser ablation in acetone, featuring a crystalline Bi\u00b0 core encapsulated within a conformal amorphous carbon shell (\u223c5\u00a0nm thick), proved via TEM. XPS with depth profiling confirms that metallic bismuth dominates the nanoparticles\u2019 composition, with oxygen\u2010containing species confined to a thin, buried interfacial region. Optical absorption measurements show a broadband response across the visible range, with no oxide\u2010associated features. Under visible irradiation, these nanoparticles exhibit sustained photoinduced redox activity, leading to the formation of hydroxyl radicals, quantified using a coumarin fluorescence assay. Methylene blue degradation is used as a model reaction to investigate charge transfer pathways and wavelength dependence, supporting a dye\u2010sensitization\u2010assisted mechanism mediated by the Bi\n                    <jats:sup>0<\/jats:sup>\n                    surface. Repeated irradiation cycles preserve photoactivity, consistent with resistance to chemical deactivation under the tested conditions. The demonstrated design provides a basis for controlled redox activity relevant to photo\u2010assisted therapeutic approaches and related biomedical technologies.\n                  <\/jats:p>","DOI":"10.1002\/smll.75889","type":"journal-article","created":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T14:51:13Z","timestamp":1790088673000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Laser\u2010Synthesized Carbon\u2010Coated Elemental Bismuth Nanoparticles for Sustained Reactive Oxygen Species Generation Under Visible\u2010Light Irradiation"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5415-8749","authenticated-orcid":false,"given":"Pavel","family":"Bezrukov","sequence":"first","affiliation":[{"name":"School of Electrical and Computer Engineering Tel Aviv University  Tel Aviv Israel"},{"name":"Light\u2010Matter Interaction Center Tel Aviv University  Tel Aviv Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-2495-0026","authenticated-orcid":false,"given":"Sravan Sangeeth","family":"Surendran","sequence":"additional","affiliation":[{"name":"LP3 Aix Marseille University  Marseille France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrey","family":"Machnev","sequence":"additional","affiliation":[{"name":"Luddy School of Informatics, Computing, and Engineering Indiana University  Bloomington Indiana USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrei","family":"Pastukhov","sequence":"additional","affiliation":[{"name":"LP3 Aix Marseille University  Marseille France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8076-5235","authenticated-orcid":false,"given":"Alexander","family":"Gumennik","sequence":"additional","affiliation":[{"name":"Luddy School of Informatics, Computing, and Engineering Indiana University  Bloomington Indiana USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1549-7198","authenticated-orcid":false,"given":"Andrei","family":"Kabashin","sequence":"additional","affiliation":[{"name":"LP3 Aix Marseille University  Marseille France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9717-3682","authenticated-orcid":false,"given":"Pavel","family":"Ginzburg","sequence":"additional","affiliation":[{"name":"School of Electrical and Computer Engineering Tel Aviv University  Tel Aviv Israel"},{"name":"Light\u2010Matter Interaction Center Tel Aviv University  Tel Aviv Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,22]]},"reference":[{"key":"e_1_2_10_2_1","first-page":"0","volume-title":"Singlet Oxygen: Applications in Biosciences and Nanosciences","author":"Krumova 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