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However, translating excited\u2010state processes into chemically responsive electronic function in conductive solids remains challenging, particularly under low\u2010energy red illumination. Herein, we report red light\u2010gated charge transfer in dye\u2010sensitized single\u2010walled carbon nanotube\u2013TiO\n                    <jats:sub>2<\/jats:sub>\n                    (SWCNT\u2013TiO\n                    <jats:sub>2<\/jats:sub>\n                    ) hybrids that enables trace oxygen detection. Immobilization of red\u2010absorbing squaraine sensitizers on TiO\n                    <jats:sub>2<\/jats:sub>\n                    domains embedded within a conductive SWCNT network reversibly generates a photostationary charge\u2010transfer state under 628\u00a0nm excitation. Despite the low photon energy of red light, the hybrid architecture supports interfacial electron injection into TiO\n                    <jats:sub>2<\/jats:sub>\n                    and hole accumulation in the nanotube scaffold, while remaining electronically dormant in the dark. Interception of photogenerated electrons by O\n                    <jats:sub>2<\/jats:sub>\n                    perturbs this light\u2010induced state and converts excited\u2010state redox chemistry into a chemiresistive signal with ppb\u2010level sensitivity. This capability enables continuous monitoring of oxygen depletion in a sealed headspace during food spoilage. Electron paramagnetic resonance spectroscopy, energy\u2010level alignment analysis, and charge\u2010carrier inversion experiments show that O\n                    <jats:sub>2<\/jats:sub>\n                    triggers light\u2010activated changes in SWCNT carrier density. These findings demonstrate that low\u2010energy optical excitation can gate chemical response in dye\u2010sensitized SWCNT\u2013TiO\n                    <jats:sub>2<\/jats:sub>\n                    hybrids, establishing a design strategy for temporally controlled sensing and photoresponsive electronic function.\n                  <\/jats:p>","DOI":"10.1002\/anie.6280554","type":"journal-article","created":{"date-parts":[[2026,10,11]],"date-time":"2026-10-11T02:41:26Z","timestamp":1791686486000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Red Light\u2010Gated Charge Transfer Enables Trace Oxygen Response in Dye\u2010Sensitized TiO\n                    <sub>2<\/sub>\n                    \u2013Carbon Nanotube Hybrids"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0579-1177","authenticated-orcid":false,"given":"Lionel","family":"Wettstein","sequence":"first","affiliation":[{"name":"Department of Chemistry and Applied Biosciences ETH Z\u00fcrich  Z\u00fcrich Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-3153-0652","authenticated-orcid":false,"given":"Aurelio C.","family":"Gasser","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Applied Biosciences ETH Z\u00fcrich  Z\u00fcrich Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-3330-2474","authenticated-orcid":false,"given":"Daniel","family":"K\u00e4ch","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Applied Biosciences ETH Z\u00fcrich  Z\u00fcrich 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