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The tremendous potential of 2D heterointerfaces for gas sensing remains largely untapped as very few attempts have been made to strike this highly promising frontier. This work focuses on an ultrasensitive and fully recoverable ethanol gas sensor featuring SnS\/SnS<jats:sub>2<\/jats:sub> p\u2013n heterojunctions that operate effectively at room temperature (RT). The SnS\/SnS<jats:sub>2<\/jats:sub> heterostructure is found to enhance the response (<jats:italic>R<\/jats:italic>\n                  <jats:sub>g<\/jats:sub>\/<jats:italic>R<\/jats:italic>\n                  <jats:sub>a<\/jats:sub>) by a factor of 1.8 times that of pristine-SnS, having rapid response and recovery times of 6.1 sec (s) and 18.3 s to 500 ppm ethanol at RT. The SnS\/SnS<jats:sub>2<\/jats:sub> nanocomposite shows excellent stability of over 40 d, with superior reproducibility and selectivity, ensuring robust sensing performance with relatively minimal impact from relative humidity. The observed improvement can be primarily attributed to optimal electronic band alignment and specific synergistic properties of nanomaterials. The enhanced sensing performance results from improved electron transport, increased adsorption sites, and effective electron transfer from SnS to SnS<jats:sub>2<\/jats:sub> in the p\u2013n heterojunctions. The present work also proposes novel insights in terms of the strategic design of chemical sensing devices and exploits the synergies based on p\u2013n heterostructures with an electron accumulation layer.<\/jats:p>\n               <jats:p>\n                  <jats:inline-formula\/>\n               <\/jats:p>","DOI":"10.1088\/1361-6528\/ade4d2","type":"journal-article","created":{"date-parts":[[2025,7,4]],"date-time":"2025-07-04T06:49:51Z","timestamp":1751611791000},"page":"275502","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["SnS\/SnS<sub>2<\/sub> p\u2013n heterojunctions: accumulation layer-driven rapid and highly sensitive ethanol detection at room temperature"],"prefix":"10.1088","volume":"36","author":[{"given":"Sunil","family":"Kumar","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2563-3747","authenticated-orcid":true,"given":"Nitin K","family":"Puri","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2025,7,4]]},"reference":[{"key":"nanoade4d2bib1","doi-asserted-by":"publisher","first-page":"9607","DOI":"10.1039\/C5NR01499A","article-title":"A magnonic gas sensor based on magnetic nanoparticles","volume":"7","author":"Matatagui","year":"2015","journal-title":"Nanoscale"},{"key":"nanoade4d2bib2","doi-asserted-by":"publisher","first-page":"1960","DOI":"10.1038\/s41598-017-02150-z","article-title":"A gas sensor array for the simultaneous detection of multiple VOCs","volume":"7","author":"Zhang","year":"2017","journal-title":"Sci. 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