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Herein, a carbonization\u2013oxidation method is demonstrated using ultrasonic spray pyrolysis technique to realize platinum (Pt) single atom (SA) substitutional doping into SnO<jats:sub>2<\/jats:sub> (named PtSA\u2010SnO<jats:sub>2<\/jats:sub>). The substitutional doping strategy can obviously enhance gas\u2010sensing properties, and meanwhile decrease sensor resistance by two orders of magnitude (decreased from \u2248850 to \u22482 M\u03a9), which are attributed to the tuning of band gap and fermi\u2010level position, efficient single atom catalysis, and the raising of adsorption capability of formaldehyde, as validated by the state\u2010of\u2010the\u2010art characterizations, such as spherical aberration\u2010corrected scanning transmission electron microscopy (C<jats:sub>s<\/jats:sub>\u2010corrected STEM), in situ diffuse reflectance infrared Fourier transformed spectra (in situ DRIFT), CO temperature\u2010programmed reduction (CO\u2010TPR), and theoretical calculations. As a proof of concept, the developed PtSA\u2010SnO<jats:sub>2<\/jats:sub> sensor shows humidity\u2010independent (30\u201370% relative humidity) gas\u2010sensing performance in the selective detection of formaldehyde with high response, distinguishable selectivity (8&lt; <jats:italic>S<\/jats:italic><jats:sub>formaldehyde<\/jats:sub>\/<jats:italic>S<\/jats:italic><jats:sub>interferant<\/jats:sub> &lt;14), and ultra\u2010low detection limit (10 ppb). This work presents a generalized and facile method to design high\u2010performance metal oxides for chemical sensing of volatile organic compounds (VOCs).<\/jats:p>","DOI":"10.1002\/smll.202310465","type":"journal-article","created":{"date-parts":[[2024,2,17]],"date-time":"2024-02-17T04:23:30Z","timestamp":1708143810000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Imparting Chemiresistor with Humidity\u2010Independent Sensitivity toward Trace\u2010Level Formaldehyde via Substitutional Doping Platinum Single Atom"],"prefix":"10.1002","volume":"20","author":[{"given":"Ningyi","family":"Wang","sequence":"first","affiliation":[{"name":"State Laboratory on Integrated Optoelectronics College of Electronic Science and Engineering Jilin University  2699 Qianjin Street Changchun 130012 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