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To unleash their potential, there is a need for non\u2010equilibrium processes capable of stabilizing a large range of crystal phases outside thermodynamic equilibrium conditions by closely and flexibly controlling atomic reactant composition, spatial temperature distribution and residence time. Here, the capture of metastable pseudo\u2010binary metal oxides at room temperature is demonstrated with scalable combustion\u2010aerosol processes. By a combination of X\u2010ray diffraction, electron microscopy and on\u2010line flame characterization, the occurrence of metastable CoCu\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    is investigated with controlled crystal size (4\u201316\u00a0nm) over thermodynamically stable CuO and Co\n                    <jats:sub>3<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    . Immediate practical impact is demonstrated by exceptional sensing and stable catalytic performance for air pollutant detection (e.g., 15 parts\u2010per\u2010billion benzene) shown for, at least, 21 days. This approach can be extended to various binary, ternary and high entropy oxides with even more components. Also, secondary phases can be loaded on such metastable nanocrystals to access novel materials promising for actuators, energy storage or solar cells.\n                  <\/jats:p>","DOI":"10.1002\/adma.202408888","type":"journal-article","created":{"date-parts":[[2024,9,10]],"date-time":"2024-09-10T04:36:58Z","timestamp":1725943018000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Metastable CoCu\n                    <sub>2<\/sub>\n                    O\n                    <sub>3<\/sub>\n                    Nanocrystals from Combustion\u2010Aerosols for Molecular Sensing and Catalysis"],"prefix":"10.1002","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8775-1573","authenticated-orcid":false,"given":"Matteo","family":"D'Andria","sequence":"first","affiliation":[{"name":"Human\u2010Centered Sensing Laboratory Department of Mechanical and Process Engineering, ETH Zurich  Zurich CH\u20108092 Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-7639-1273","authenticated-orcid":false,"given":"Tiago","family":"Elias Abi\u2010Ramia Silva","sequence":"additional","affiliation":[{"name":"Human\u2010Centered Sensing Laboratory Department of Mechanical and Process Engineering, ETH Zurich  Zurich CH\u20108092 Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Edoardo","family":"Consogno","sequence":"additional","affiliation":[{"name":"Human\u2010Centered Sensing Laboratory Department of Mechanical and Process Engineering, ETH Zurich  Zurich CH\u20108092 Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5625-1536","authenticated-orcid":false,"given":"Frank","family":"Krumeich","sequence":"additional","affiliation":[{"name":"Laboratory of Inorganic Chemistry Department of Chemistry and Applied Biosciences ETH Zurich  Zurich CH\u20108093 Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4127-752X","authenticated-orcid":false,"given":"Andreas T.","family":"G\u00fcntner","sequence":"additional","affiliation":[{"name":"Human\u2010Centered Sensing Laboratory Department of Mechanical and Process Engineering, ETH Zurich  Zurich CH\u20108092 Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,9,10]]},"reference":[{"key":"e_1_2_9_1_1","doi-asserted-by":"publisher","DOI":"10.1039\/C2CS35072F"},{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/natrevmats.2017.75"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/natrevmats.2016.98"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.1228604"},{"key":"e_1_2_9_5_1","author":"G\u00fcntner A. 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