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This work introduces a novel Au\/Pt-decorated SnS\n                    <jats:sub>2<\/jats:sub>\n                    heterostructure for exhaled NO\n                    <jats:sub>2<\/jats:sub>\n                    detection, representing the new study to explore its role in lung disease diagnostics. It demonstrates ppb level NO\n                    <jats:sub>2<\/jats:sub>\n                    detection, a key biomarker for asthma and COPD, enabling early and differentiation of lung conditions by providing quantitative analysis of trace-level gases, which are often elevated in inflamed airways. While two-dimensional (2D) SnS\n                    <jats:sub>2<\/jats:sub>\n                    offers strong potential as a sensing platform, prior studies relied mainly on density functional theory (DFT) based gas sensing. Here, we present unprecedented integration of DFT and machine learning (ML) to investigate the gas sensing performance of pristine and Au\/Pt-decorated SnS\n                    <jats:sub>2<\/jats:sub>\n                    monolayers. DFT analysis revealed enhanced adsorption and charge transfer upon noble-metal decoration, with Pt\u2013SnS\n                    <jats:sub>2<\/jats:sub>\n                    showing optimal characteristics for asthma and COPD detection. Five ML models were trained on DFT and experimental-derived descriptors to rapidly predict the sensing behaviour of multiple gases, including NO\n                    <jats:sub>2<\/jats:sub>\n                    , among which XGBoost achieving\n                    <jats:italic>R<\/jats:italic>\n                    <jats:sup>2<\/jats:sup>\n                    = 0.9961. Both ML and DFT methods consistently identified NO\n                    <jats:sub>2<\/jats:sub>\n                    as the most sensitive analyte. This novel DFT\u2013ML synergy not only validates fundamental adsorption mechanisms but also provides a scalable pathway for accelerated screening and design of high-performance gas sensors. Our findings establish a new prototype for integrating ML with first-principles simulations in the design of next-generation 2D material-based sensing devices.\n                  <\/jats:p>","DOI":"10.1088\/1361-6528\/ae8672","type":"journal-article","created":{"date-parts":[[2026,7,6]],"date-time":"2026-07-06T22:48:14Z","timestamp":1783378094000},"page":"295101","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["DFT and machine learning investigation of Au\/Pt-decorated SnS\n                    <sub>2<\/sub>\n                    monolayers for asthma and COPD diagnosis"],"prefix":"10.1088","volume":"37","author":[{"given":"Kaustubh","family":"Kulshreshtha","sequence":"first","affiliation":[{"name":"Netaji Subhas University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daksh","family":"Bansal","sequence":"additional","affiliation":[{"name":"Netaji Subhas University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-9631-1377","authenticated-orcid":true,"given":"Manasvi","family":"Raj","sequence":"additional","affiliation":[{"name":"Netaji Subhas University of Technology"},{"name":"Bagmane Tech Park"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8740-6737","authenticated-orcid":true,"given":"Neeraj","family":"Goel","sequence":"additional","affiliation":[{"name":"Netaji Subhas University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2026,7,23]]},"reference":[{"key":"nanoae8672bib1","first-page":"1","type":"book","article-title":"Chronic respiratory diseases: an introduction and need for novel drug delivery approaches","author":"Shukla","year":"2020"},{"key":"nanoae8672bib2","doi-asserted-by":"publisher","DOI":"10.1016\/j.eclinm.2023.101936","type":"journal-article","article-title":"Global burden of chronic respiratory diseases and risk factors, 1990\u20132019: an update from the global burden of disease study 2019","volume":"59","author":"Momtazmanesh","year":"2023","journal-title":"EClinicalMedicine"},{"key":"nanoae8672bib3","doi-asserted-by":"publisher","first-page":"679","DOI":"10.1080\/17476348.2022.2011221","type":"journal-article","article-title":"Diagnostic value of fractional exhaled nitric oxide in differentiating the asthma-COPD overlap from COPD: a systematic review and meta-analysis","volume":"16","author":"Zhang","year":"2022","journal-title":"Expert Rev. 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