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However, achieving high sensitivity and selectivity for real\u2010time applications remains challenging. In this study, a room\u2010temperature operated formaldehyde chemiresistor is developed by cerium dioxide\/indium oxide (CeO\n                    <jats:sub>2<\/jats:sub>\n                    \/In\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    ) nanocomposite for exclusive detection. The nanocomposite is synthesized using hydrothermal, forming CeO\n                    <jats:sub>2<\/jats:sub>\n                    nanospheres grown on In\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    nanocubes. This unique structure enhances the sensing capabilities of CeO\n                    <jats:sub>2<\/jats:sub>\n                    \/In\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    , allowing it to detect formaldehyde in the 1\u201350\u00a0ppm range, and a 0.157\u00a0ppm detection limit is earned. The sensor exhibits an impressive response of 175.05 at 50\u00a0ppm at room temperature and shows responsiveness to various other substances, for instance, methanol, ethanol, aniline, benzene, toluene, acetone, and ammonia. Additionally, the CeO\n                    <jats:sub>2<\/jats:sub>\n                    \/In\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    sensor demonstrated moderate to high selectivity, sensitivity, stability, speedy response\/recovery times, and resilience to humidity. This work presents a promising strategy for the detection of formaldehyde.\n                  <\/jats:p>","DOI":"10.1002\/smll.202410023","type":"journal-article","created":{"date-parts":[[2025,4,24]],"date-time":"2025-04-24T08:35:13Z","timestamp":1745483713000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Humidity\u2010Resistant CeO\n                    <sub>2<\/sub>\n                    \/In\n                    <sub>2<\/sub>\n                    O\n                    <sub>3<\/sub>\n                    Nanocomposite\u2010Based Chemiresistor for Selective Detection of Formaldehyde"],"prefix":"10.1002","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6028-0003","authenticated-orcid":false,"given":"Ajeet","family":"Singh","sequence":"first","affiliation":[{"name":"Nanomaterials and Sensors Research Laboratory (NMSRL) Department of Physics School of Physical &amp; Decision Science Babasaheb Bhimrao Ambedkar University  Lucknow UP 226025 India"},{"name":"Centro de Qu\u00edmica Estrutural Institute of Molecular Sciences Instituto Superior T\u00e9cnico Universidade de Lisboa  Av. Rovisco Pais 1 Lisboa 1049\u2010001 Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2414-9152","authenticated-orcid":false,"given":"Brij","family":"Mohan","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural Institute of Molecular Sciences Instituto Superior T\u00e9cnico Universidade de Lisboa  Av. Rovisco Pais 1 Lisboa 1049\u2010001 Portugal"}]},{"given":"Vijay","family":"Pratap","sequence":"additional","affiliation":[{"name":"Department of Physics Institute of Science Banaras Hindu University  Varanasi UP 221005 India"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9923-7328","authenticated-orcid":false,"given":"Wei","family":"Sun","sequence":"additional","affiliation":[{"name":"Hainan International Joint Research Center of Marine Advanced Photoelectric Functional Materials Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province College of Chemistry and Chemical Engineering Hainan Normal University  Haikou 571158 China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8323-888X","authenticated-orcid":false,"given":"Armando J. L.","family":"Pombeiro","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural Institute of Molecular Sciences Instituto Superior T\u00e9cnico Universidade de Lisboa  Av. 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