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Transition metal carbides (TMCs), like Mo\n                    <jats:sub>2<\/jats:sub>\n                    C, are novel gas\u2010sensing materials attributed to high electronic conductivity and superior catalytic properties. Poor sensitivity and selectivity are big concerns in TMC\u2010based sensors due to their low specific surface area and fewer reactive sites. Partial oxidation of Mo\n                    <jats:sub>2<\/jats:sub>\n                    C offers the tuning of structural, chemical, and electronic properties. However, conventional techniques, annealing, and solution processing offer uncontrolled oxidation and lead to structural degradation. Herein, by using a temporally and spatially controlled picosecond (ps) pulsed laser, micropatterned Mo\n                    <jats:sub>2<\/jats:sub>\n                    C\u2010derived oxide (MoO\n                    <jats:sub>3<\/jats:sub>\n                    ) is developed at room temperature for highly efficient ammonia (NH\n                    <jats:sub>3<\/jats:sub>\n                    ) sensing. The uniformly decorated MoO\n                    <jats:sub>3<\/jats:sub>\n                    nanoclusters over Mo\n                    <jats:sub>2<\/jats:sub>\n                    C function as active centers for better NH\n                    <jats:sub>3<\/jats:sub>\n                    interaction and formation of discrete Schottky barriers (SBs) between materials, tuning the charge carrier transportation. The MoO\n                    <jats:sub>3<\/jats:sub>\n                    \/Mo\n                    <jats:sub>2<\/jats:sub>\n                    C sensor exhibited excellent selectivity toward NH\n                    <jats:sub>3<\/jats:sub>\n                    over other interfering gases like hydrogen, ethanol, and acetone. This sensor showed excellent sensitivity (351%\/100 parts per billion (ppb) NH\n                    <jats:sub>3<\/jats:sub>\n                    ) and long\u2010term stability. The Mo\n                    <jats:sub>2<\/jats:sub>\n                    C laser\u2010treated sensor has been successfully tested for monitoring food spoilage. Laser\u2010assisted engineering will provide a new avenue for designing highly efficient gas sensors.\n                  <\/jats:p>","DOI":"10.1002\/smtd.202501246","type":"journal-article","created":{"date-parts":[[2025,9,17]],"date-time":"2025-09-17T06:40:57Z","timestamp":1758091257000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Laser\u2010Assisted Mo\n                    <sub>2<\/sub>\n                    C\u2010Derived Patterned Oxide for Highly Selective Room Temperature Ammonia Sensor for Food Spoilage Monitoring"],"prefix":"10.1002","volume":"9","author":[{"given":"Radha","family":"Bhardwaj","sequence":"first","affiliation":[{"name":"Future Energy and Innovation Laboratory Central European Institute of Technology Brno University of Technology  Purky\u0148ova 123 Brno 61200 Czech Republic"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sujit","family":"Deshmukh","sequence":"additional","affiliation":[{"name":"Future Energy and Innovation Laboratory Central European Institute of Technology Brno University of Technology  Purky\u0148ova 123 Brno 61200 Czech Republic"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5846-2951","authenticated-orcid":false,"given":"Martin","family":"Pumera","sequence":"additional","affiliation":[{"name":"Future Energy and Innovation Laboratory Central European Institute of Technology Brno University of Technology  Purky\u0148ova 123 Brno 61200 Czech Republic"},{"name":"Department of Medical Research China Medical University Hospital China Medical University  No. 91 Hsueh\u2010Shih Road Taichung 40402 Taiwan"},{"name":"Department of Chemical and Biomolecular Engineering Yonsei University  50 Yonsei\u2010ro, Seodaemun\u2010gu Seoul 03722 South Korea"},{"name":"Faculty of Electrical Engineering and Computer Science VSB \u2013 Technical University of Ostrava  17. listopadu 2172\/15 Ostrava 70800 Czech 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