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In this study, we report for the first time the construction of sequence\u2010controlled Janus COF films from lattice\u2010matched isoreticular COFs (COF\u2010366\/COF\u2010366\u2010OH). The intimate interfacial assembly and the energy\u2010level offset induce a built\u2010in electric field that drives electrons and holes to migrate directionally toward opposite sides across the entire film. This asymmetric charge distribution endows the two sides of the film with distinct redox activities, enabling switchable and highly sensitive detection of both oxidizing and reducing gases by simply flipping the film. Such a unique feature is unprecedented for a single film. Moreover, the response of Janus COF film surpasses that of single\u2010component counterparts by 5.2\u2010fold for NO\n                    <jats:sub>2<\/jats:sub>\n                    and 5.3\u2010fold for NH\n                    <jats:sub>3<\/jats:sub>\n                    . This work offers a general strategy for macroscopic directional carrier migration in COF films and paves a new route for advanced sensing materials.\n                  <\/jats:p>","DOI":"10.1002\/anie.2808034","type":"journal-article","created":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T04:55:22Z","timestamp":1790052922000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Janus Covalent Organic Framework Films With Macroscopic Directional Carrier Migration for Switchable Gas Sensing"],"prefix":"10.1002","author":[{"given":"Yong\u2010Jun","family":"Chen","sequence":"first","affiliation":[{"name":"State Key Laboratory of Structural Chemistry Fujian Provincial Key Laboratory of Materials and Techniques toward Hydrogen Energy Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences (CAS)  Fuzhou Fujian P. R. 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