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Chromism\u2010based sensors, known for their simplicity, portability, and real\u2010time detection capabilities, have faced limitations in EtOH sensing due to insufficient sensitivity, low selectivity, irreversibility, and low color perception. Herein, a groundbreaking solvato\/vapochromism\u2010based EtOH sensor utilizing a Cu\u2010based metal\u2013organic framework (MOF) thin film, Cu\u2010MOF\u201074, is reported. The conversion of Cu\u2010based ceramics to Cu\u2010MOF\u201074 facilitates the fabrication of solvato\/vapochromic MOF thin films with low light scattering, enabling effective colorimetric analysis. The Cu\u2010MOF\u201074 thin films demonstrate rapid and reversible solvato\/vapochromism upon the adsorption of guest molecules, including water and EtOH. This unique behavior allows for the precise and reliable detection of EtOH across the entire concentration range. Furthermore, a smartphone application is developed to detect EtOH concentrations, enabling rapid and convenient evaluation of EtOH levels. The findings represent a significant advancement in EtOH sensing technology, overcoming the limitations of traditional methods. The Cu\u2010MOF\u201074\u2010based sensor offers a versatile and reliable solution for various applications, including environmental monitoring, process control, and healthcare.<\/jats:p>","DOI":"10.1002\/smsc.202400634","type":"journal-article","created":{"date-parts":[[2025,2,22]],"date-time":"2025-02-22T03:49:21Z","timestamp":1740196161000},"source":"Crossref","is-referenced-by-count":4,"title":["Solvato\/Vapochromism\u2010Based Alcohol Sensing through Metal\u2013Organic Framework Thin Films with Coordinatively Unsaturated Metal Sites"],"prefix":"10.1002","volume":"5","author":[{"given":"Yuto","family":"Toki","sequence":"first","affiliation":[{"name":"Department of Materials Science Graduate School of Engineering Osaka Metropolitan University  1\u20101 Gakuen\u2010cho, Naka\u2010ku Sakai Osaka 599\u20108531 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2176-693X","authenticated-orcid":false,"given":"Kenji","family":"Okada","sequence":"additional","affiliation":[{"name":"Department of Materials Science Graduate School of Engineering Osaka Metropolitan University  1\u20101 Gakuen\u2010cho, Naka\u2010ku Sakai Osaka 599\u20108531 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2887-1452","authenticated-orcid":false,"given":"Arisa","family":"Fukatsu","sequence":"additional","affiliation":[{"name":"Department of Materials Science Graduate School of Engineering Osaka Metropolitan University  1\u20101 Gakuen\u2010cho, Naka\u2010ku Sakai Osaka 599\u20108531 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4224-4532","authenticated-orcid":false,"given":"Yuta","family":"Tsuji","sequence":"additional","affiliation":[{"name":"Faculty of Engineering Sciences Kyushu University  6\u20101, Kasuga\u2010koen, Kasuga Fukuoka 816\u20108580 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7273-1660","authenticated-orcid":false,"given":"Masahide","family":"Takahashi","sequence":"additional","affiliation":[{"name":"Department of Materials Science Graduate School of Engineering Osaka Metropolitan University  1\u20101 Gakuen\u2010cho, Naka\u2010ku Sakai Osaka 599\u20108531 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,2,22]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.18433\/jpps30572"},{"key":"e_1_2_9_3_1","first-page":"1","volume":"14","author":"Najiha A. 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