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However, this approach is limited to iron oxide\u2010based ferromagnetic materials, which are unsuitable for H\n                    <jats:sub>2<\/jats:sub>\n                    S gas detection. Cobalt oxide is advantageous for H\n                    <jats:sub>2<\/jats:sub>\n                    S detection despite being intrinsically antiferromagnetic. The key challenge is thus inducing a net ferromagnetic moment in Co\n                    <jats:sub>3<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    for the fabrication of micropillar arrays, designed to enhance H\n                    <jats:sub>2<\/jats:sub>\n                    S gas sensitivity. Herein, a lithiation\u2010based galvanostatic reduction (LiGr) process synthesizes a material (LiGr\u2010Co) featuring a Co\n                    <jats:sub>3<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    \/CoO heterointerface, few\u2010nanometer\u2010scaled particles, and oxygen vacancies. The sub\u2010nanometer\u2010sized particles and oxygen vacancies significantly enhance H\n                    <jats:sub>2<\/jats:sub>\n                    S gas\u2010sensing performance by promoting the formation of short\u2010range order between Co\n                    <jats:sup>2+<\/jats:sup>\n                    and Co\n                    <jats:sup>3+<\/jats:sup>\n                    ions. Furthermore, the Co\n                    <jats:sub>3<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    \/CoO heterointerface provides the pathway to induce the desired magnetism, as a resulting crystallographic mistilt at the interface generates the required magnetic moment. The aligned LiGr\u2010Co (A\u2010LiGr\u2010Co) sensor, under a magnetic field during the spray coating process, showed improved efficiency in gas adsorption and electron transfer, leading to a reduction of the base resistance and an enhancement of gas\u2010sensing capabilities. A\u2010LiGr\u2010Co demonstrated a high response (\n                    <jats:italic>R<\/jats:italic>\n                    <jats:sub>g<\/jats:sub>\n                    \/\n                    <jats:italic>R<\/jats:italic>\n                    <jats:sub>a<\/jats:sub>\n                    ) of 39.7 at 5\u00a0ppm and high selectivity for H\n                    <jats:sub>2<\/jats:sub>\n                    S detection at 150\u00b0C.\n                  <\/jats:p>","DOI":"10.1002\/smll.73475","type":"journal-article","created":{"date-parts":[[2026,4,21]],"date-time":"2026-04-21T12:45:21Z","timestamp":1776775521000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Ferromagnetic Cobalt Oxide With Structural Distortion and Oxidation State Changes for Hydrogen Sulfide Gas Detection"],"prefix":"10.1002","volume":"22","author":[{"given":"Shin Joon","family":"Kang","sequence":"first","affiliation":[{"name":"School of Mechanical Engineering and Department of Smart Fab. Technology Sungkyunkwan University  Suwon Gyeonggi\u2010do Republic of Korea"},{"name":"Smart Sensor Research Center Korea Electronics Technology Institute (KETI)  Seongnam Gyeonggi\u2010do Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chang Yoon","family":"Kim","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering and Department of Smart Fab. Technology Sungkyunkwan University  Suwon Gyeonggi\u2010do Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min Chan","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Chemical Engineering Jeju National University Jeju Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sunhyeong","family":"Kwon","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering and Department of Smart Fab. Technology Sungkyunkwan University  Suwon Gyeonggi\u2010do Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joon\u2010Shik","family":"Park","sequence":"additional","affiliation":[{"name":"Smart Sensor Research Center Korea Electronics Technology Institute (KETI)  Seongnam Gyeonggi\u2010do Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hyung Mo","family":"Jeong","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering and Department of Smart Fab. 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