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Porous 2D metal oxide semiconductors (2D MOSs) with superior electrical and catalytic characteristics are deemed as promising materials for flexible gas sensors, especially for low\u2010concentration gas detection; however, the synthesis of high\u2010quality 2D MOSs remains challenging. In this study, 2D porous In\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    nanosheets with a high specific surface area (85.9 m\n                    <jats:sup>2<\/jats:sup>\n                    \/g) and a thickness of 4.0\u00a0nm are synthesized via a scalable micro\u2010explosion assisted caramelization reaction. The synthesis parameters affecting the formation of 2D porous metal oxide nanostructures are systematically studied, and a proposed growth mechanism is dominated by generating the sacrificial 2D carbon intermediate templates. Furthermore, flexible gas sensors are fabricated by depositing 2D porous In\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    nanosheets on polyimide substrates, which exhibit outstanding sensing performance with high sensitivity toward trace hydrogen sulfide (response value of 17.3 for 250 ppb) at 37 \u00b0C, excellent selectivity, and high stability. The sensor is further integrated into a wearable, flexible wireless sensing device, showing good reliability and great potential in detecting trace hydrogen sulfide in practical applications.\n                  <\/jats:p>","DOI":"10.1002\/smll.202505870","type":"journal-article","created":{"date-parts":[[2025,10,14]],"date-time":"2025-10-14T12:23:14Z","timestamp":1760444594000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Synthesis of 2D Porous Indium Oxide Nanosheets for Fabrication of High\u2010Performance Flexible Gas Sensors"],"prefix":"10.1002","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-4349-7233","authenticated-orcid":false,"given":"Jichun","family":"Li","sequence":"first","affiliation":[{"name":"Department of Chemistry Shanghai Stomatological Hospital &amp; School of Stomatology State Key Laboratory of Coatings for Advanced Equipment Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University  Shanghai 200433 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu","family":"Deng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Fiber Materials College of Materials Science and Engineering Donghua University  Shanghai 201620 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luyang","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Chemistry Shanghai Stomatological Hospital &amp; School of Stomatology State Key Laboratory of Coatings for Advanced Equipment Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University  Shanghai 200433 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yidan","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Chemistry Shanghai Stomatological Hospital &amp; School of Stomatology State Key Laboratory of Coatings for Advanced Equipment Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University  Shanghai 200433 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fengluan","family":"Jiang","sequence":"additional","affiliation":[{"name":"Department of Chemistry Shanghai Stomatological Hospital &amp; School of Stomatology State Key Laboratory of Coatings for Advanced Equipment Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University  Shanghai 200433 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meihua","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Chemistry Shanghai Stomatological Hospital &amp; School of Stomatology State Key Laboratory of Coatings for Advanced Equipment Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University  Shanghai 200433 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianfeng","family":"Xia","sequence":"additional","affiliation":[{"name":"Zhejiang Fulai New Materials, Co. Ltd.  Zhejiang 314103 P. R. 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