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Herein, we developed a Pt@ZIF-8\/Cu2O heterojunction sensor via a two-dimensional electrodeposition in-situ assembly strategy for sensitive H2S detection. This sensor exhibits superior room-temperature sensing performance: a remarkably high response of 8931 toward 10 ppm of H2S, an ultralow detection limit of 10 ppb (response \u223c0.61), and a 11.8-fold enhancement in response to 500 ppb H2S relative to pristine Cu2O. The exceptional sensing performance is attributed to the synergistic effects of the high-specific-surface-area structure, the catalytic activity of Pt nanoparticles, and optimized interfacial charge transfer at the heterojunction. Notably, as the relative humidity increases from 37 to 94%, the response time toward 5 ppm of H2S decreased by \u223c33% (from 330 to 220 s), while the response magnitude concurrently increases by \u223c117% (from 3183 to 6907). This humidity-induced performance improvement significantly enhances operational reliability in practical applications, thereby eliminating the requirement for complex humidity control systems. This unique phenomenon is associated with the [Zn\u2013OH]+ active sites within the ZIF-8 framework, which facilitate the adsorption of H2S molecules. More importantly, the sensor enables sensitively quantification of H2S concentrations in human exhaled breath, highlighting its great potential for noninvasive disease diagnosis.<\/jats:p>","DOI":"10.1021\/acs.analchem.6c02006","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T15:02:43Z","timestamp":1790175763000},"page":"28745-28756","source":"Crossref","is-referenced-by-count":0,"title":["Ultrasensitive\nExhaled H2S Sensor Enabled\nby Pt@ZIF-8\/Cu2O Heterostructures"],"prefix":"10.1021","volume":"98","author":[{"given":"Luan","family":"Fu","sequence":"first","affiliation":[{"name":"Linyi University , , ,","place":["Linyi, China, 276000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-3607-0679","authenticated-orcid":true,"given":"Lulu","family":"Du","sequence":"additional","affiliation":[{"name":"Linyi University , , ,","place":["Linyi, China, 276000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weizhong","family":"Tan","sequence":"additional","affiliation":[{"name":"Linyi University , , ,","place":["Linyi, China, 276000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zihao","family":"Liang","sequence":"additional","affiliation":[{"name":"Linyi University , , ,","place":["Linyi, China, 276000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5610-9775","authenticated-orcid":true,"given":"Xiaohui","family":"Shi","sequence":"additional","affiliation":[{"name":"Linyi University , , ,","place":["Linyi, China, 276000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-4848-0068","authenticated-orcid":true,"given":"Li","family":"Lv","sequence":"additional","affiliation":[{"name":"Linyi University , , ,","place":["Linyi, China, 276000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3506-881X","authenticated-orcid":true,"given":"Pinhua","family":"Zhang","sequence":"additional","affiliation":[{"name":"Linyi University , , ,","place":["Linyi, China, 276000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9379-5353","authenticated-orcid":true,"given":"Guangliang","family":"Cui","sequence":"additional","affiliation":[{"name":"Linyi University , , ,","place":["Linyi, China, 276000"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,23]]},"reference":[{"key":"2026100608080599900_cit1","doi-asserted-by":"publisher","first-page":"7144","DOI":"10.1021\/acssensors.5c02525","article-title":"Low-Temperature-Enhanced\nand Ultrasensitive Exhaled\nH2S Gas Sensor Based on Cu2O-CuFe2O4 Nanoarrays","volume":"10","author":"Tan","year":"2025","journal-title":"ACS Sens."},{"key":"2026100608080599900_cit2","doi-asserted-by":"publisher","first-page":"3952","DOI":"10.1021\/acssensors.3c01594","article-title":"Ultrasensitive Bio-H2S\nGas Sensor Based on Cu2O-MWCNT Heterostructures","volume":"8","author":"Lu","year":"2023","journal-title":"ACS Sens."},{"key":"2026100608080599900_cit3","doi-asserted-by":"publisher","first-page":"16907","DOI":"10.1021\/acsnano.0c05916","article-title":"Colorimetric Dye-Loaded Nanofiber\nYarn: Eye-Readable\nand Weavable Gas Sensing Platform","volume":"14","author":"Kim","year":"2020","journal-title":"ACS Nano"},{"key":"2026100608080599900_cit4","doi-asserted-by":"publisher","first-page":"2579","DOI":"10.1021\/acssensors.4c02989","article-title":"Oral Exhalation\nH2S Sensor Based on Cu2O\/ZnO Heterostructures","volume":"10","author":"Chen","year":"2025","journal-title":"ACS Sens."},{"key":"2026100608080599900_cit5","doi-asserted-by":"publisher","first-page":"197","DOI":"10.1016\/j.snb.2013.02.112","article-title":"Ppb H2S gas sensing characteristics of Cu2O\/CuO sub-microspheres\nat low-temperature","volume":"182","author":"Meng","year":"2013","journal-title":"Sensor Actuat. 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