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This study develops a novel material\u2010driven gas sensor selectivity strategy by tailoring the surface energy of TiO\n                    <jats:sub>2\u2010<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>y<\/jats:sub>\n                    <\/jats:italic>\n                    (TO) and Ti\n                    <jats:sub>1\u2010<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>x<\/jats:sub>\n                    <\/jats:italic>\n                    Pt\n                    <jats:italic>\n                      <jats:sub>x<\/jats:sub>\n                    <\/jats:italic>\n                    O\n                    <jats:sub>2\u2010<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>y<\/jats:sub>\n                    <\/jats:italic>\n                    (TPO) nanosheet (NS) supports to control the morphology of decorated Au catalysts. Through precise modulation of the substrate surface energies of TO\/TPO NSs, the sizes and shapes of the Au catalysts can be engineered from nanoparticles (NPs) to micro\u2010sized sheets without significant changes in chemical composition. This morphological control enables the realization of molecular weight\u2010dependent gas selectivity, achieving enhanced detection of target gases, such as CO\n                    <jats:sub>2<\/jats:sub>\n                    , ethanol, benzene, and toluene, with molecular weights of 40 or higher. In contrast to conventional approaches reliant on passive material properties, this strategy leverages engineered material interfaces and catalyst morphologies to actively direct gas sensing behavior. Furthermore, these results overturn the conventional notion that smaller catalysts necessarily yield higher reactivity, demonstrating that catalyst size and shape, governed by substrate\u2010material interactions, can be key determinants of chemical reactivity. This finding provides a new pathway for the rational design of selective gas sensors through advanced materials engineering.\n                  <\/jats:p>","DOI":"10.1002\/smll.202509219","type":"journal-article","created":{"date-parts":[[2025,10,22]],"date-time":"2025-10-22T15:49:04Z","timestamp":1761148144000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Tuning Gas Sensor Selectivity via Morphological Engineering of Au Catalysts on TiO\n                    <sub>2<\/sub>\n                    \u2010based Nanosheets"],"prefix":"10.1002","volume":"21","author":[{"given":"Sol","family":"Han","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering Yonsei University  Seoul 03722 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong Whan","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering 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