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We report indium sulfide (In\n                    <jats:sub>2<\/jats:sub>\n                    S\n                    <jats:sub>3<\/jats:sub>\n                    ) flakes were grown via chemical vapor deposition (CVD) and functionalized with palladium (Pd) nanoparticles(NPs) to develop a high-performance chemiresistive H\n                    <jats:sub>2<\/jats:sub>\n                    S gas sensor. The pristine In\n                    <jats:sub>2<\/jats:sub>\n                    S\n                    <jats:sub>3<\/jats:sub>\n                    flakes have a porous microstructure with abundance of active sites, however the addition of Pd NPs improves the gas sensing response through enhancing charge transfer interactions along with providing catalytic spillover sites. The Pd-functionalized In\n                    <jats:sub>2<\/jats:sub>\n                    S\n                    <jats:sub>3<\/jats:sub>\n                    sensor demonstrated a increase in respone (1.4-fold) and selectivity towards H\n                    <jats:sub>2<\/jats:sub>\n                    S, attaining a sensing response of approximately 67.60% at 50 ppm concentration at 75 \u00b0C. The sensor demonstrated rapid kinetics with response and recovery times of 48 s and 260 s, respectively, and a remarkably low limit of detection of 59 ppb. Furthermore, the sensor confirmed high humidity tolerance up to 80% RH and excellent repeatability. Density functional theory calculations discovered an 8-fold increase in adsorption energy (\u22121.51 eV) and significant charge transfer (\u22120.086 e\n                    <jats:sup>-<\/jats:sup>\n                    ) upon Pd decoration, correlating the electronic sensitization of the Schottky barrier to the observed ppb-level sensitivity. With the use of first-principles calculations that explain the underlying sensing process, this work presents a practical strategy to develop efficient H\n                    <jats:sub>2<\/jats:sub>\n                    S gas sensors through the use of CVD-grown sulfide semiconductors with decoration of noble metal NPs.\n                  <\/jats:p>","DOI":"10.1088\/1361-6528\/ae7382","type":"journal-article","created":{"date-parts":[[2026,5,27]],"date-time":"2026-05-27T22:49:03Z","timestamp":1779922143000},"page":"245501","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Synergistic H\n                    <sub>2<\/sub>\n                    S sensing in Pd-functionalized In\n                    <sub>2<\/sub>\n                    S\n                    <sub>3<\/sub>\n                    flakes"],"prefix":"10.1088","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7192-0793","authenticated-orcid":true,"given":"Ashok","family":"Kumar","sequence":"first","affiliation":[{"name":"Indian Institute of Technology Jodhpur"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Raushan","family":"Kumar","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology Jodhpur"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4968-6352","authenticated-orcid":true,"given":"Akash Popat","family":"Gutal","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chaitanya B","family":"Auti","sequence":"additional","affiliation":[{"name":"School of Physical Sciences, Indian Institute of Technology Mandi"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amit","family":"Kumar","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology Jodhpur"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sumit","family":"Kumar","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology Jodhpur"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6197-1191","authenticated-orcid":true,"given":"Monika","family":"Kwoka-Czornik","sequence":"additional","affiliation":[{"name":"Electronics and Computer Science, Silesian University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1079-8592","authenticated-orcid":true,"given":"Pradeep","family":"Kumar","sequence":"additional","affiliation":[{"name":"School of Physical Sciences, Indian Institute of Technology Mandi"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4126-6206","authenticated-orcid":true,"given":"Manikandan","family":"Paranjothy","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5357-7300","authenticated-orcid":true,"given":"Mahesh","family":"Kumar","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology Jodhpur"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2026,6,15]]},"reference":[{"key":"nanoae7382bib1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ccr.2022.214752","type":"journal-article","article-title":"Metal oxide nanofibers based chemiresistive H2S gas sensors","volume":"471","author":"Shaik","year":"2022","journal-title":"Coord. 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