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However, single\u2010metal oxides exhibit limited sensitivity and selectivity due to insufficient active sites and weak catalytic activity. Although metal doping and noble\u2010metal decoration provide partial improvements, these strategies remain constrained by dopant instability, restricted compositional diversity, and high material costs of noble metals. High\u2010entropy materials offer an attractive platform for tuning structure and reactivity through large configurational entropy, which induces lattice distortion, diverse electronic coordination, and defect\u2010rich environments. Here, we present an ethanol (C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>5<\/jats:sub>\n                    OH) gas sensor based on high\u2010entropy oxide (HEO) nanostructures composed of In, Sn, Fe, Zn, and W. The HEO\u2010based sensor exhibits a higher response to ethanol than low\u2010 and medium\u2010entropy oxides and maintains fast kinetics, stable cycling, and reliable operation under humid conditions. Mechanistic analysis reveals that entropy\u2010driven shifts in the\n                    <jats:italic>d<\/jats:italic>\n                    \u2010band structure, the enrichment of oxygen vacancies, and increased chemisorbed oxygen strengthen the surface reaction pathway. These findings establish configurational entropy as an effective strategy for chemoresistive gas sensors with high reactivity and robust long\u2010term performance.\n                  <\/jats:p>","DOI":"10.1002\/advs.75724","type":"journal-article","created":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T13:04:57Z","timestamp":1779282297000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["A High\u2010Entropy Strategy for Chemoresistive Ethanol Sensors With Remarkably Rapid and Selective Response"],"prefix":"10.1002","volume":"13","author":[{"given":"Gi Baek","family":"Nam","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jin Ho","family":"Seo","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Youngmin","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hyuk Jin","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yeong Jae","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seon Ju","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"YunKyung","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hyeon\u2010Min","family":"Yu","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiwoo","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ji Hyeon","family":"Lim","sequence":"additional","affiliation":[{"name":"School of Chemical and Biological Engineering and the Institute of Chemical Process Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3415-9151","authenticated-orcid":false,"given":"Jiheon","family":"Lim","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4197-9070","authenticated-orcid":false,"given":"Jong Hun","family":"Kang","sequence":"additional","affiliation":[{"name":"School of Chemical and Biological Engineering and the Institute of Chemical Process Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5266-3795","authenticated-orcid":false,"given":"WooChul","family":"Jung","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University  Seoul Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jong Jin","family":"Jung","sequence":"additional","affiliation":[{"name":"Sentech Korea Corp.  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