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Compared to sensors utilizing unalkalized Ti3C2Tx, those employing alkalized Ti3C2Tx MXene exhibited enhanced sensitivity for NH3 detection at room temperature and a relative humidity of 40%. Both the concentration of NaOH and duration of alkalization significantly influenced sensor performance. Among the tested conditions, Ti3C2Tx MXene alkalized with a 5 M NaOH solution for 12 h exhibited optimal performance, with high response values of 100.3% and a rapid response\/recovery time of 73 s and 38 s, respectively. The improved sensitivity of NH3 detection can be attributed to the heightened NH3 adsorption capability of oxygen-rich terminals obtained through the alkalization treatment. This is consistent with the observed increase in the ratio of oxygen to fluorine atoms on the surface terminations of the alkalization-treated Ti3C2Tx. These findings suggest that the gas-sensing characteristics of Ti3C2Tx MXene can be finely tuned and optimized through a carefully tailored alkalization process, offering a viable approach to realizing high-performance Ti3C2Tx MXene gas sensors, particularly for NH3 sensing applications.<\/jats:p>","DOI":"10.3390\/nano14080680","type":"journal-article","created":{"date-parts":[[2024,4,16]],"date-time":"2024-04-16T11:13:02Z","timestamp":1713265982000},"page":"680","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Sensitivity-Enhanced, Room-Temperature Detection of NH3 with Alkalized Ti3C2Tx MXene"],"prefix":"10.3390","volume":"14","author":[{"given":"Yi","family":"Tan","sequence":"first","affiliation":[{"name":"School of Science, Hubei University of Technology, Wuhan 430068, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5307-0518","authenticated-orcid":false,"given":"Jinxia","family":"Xu","sequence":"additional","affiliation":[{"name":"School of Science, Hubei University of Technology, Wuhan 430068, China"},{"name":"Hubei Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System, Hubei University of Technology, Wuhan 430068, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9778-7695","authenticated-orcid":false,"given":"Qiliang","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Advanced Manufacturing and Robotics, College of Engineering, Peking University, Beijing 100871, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wanting","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Science, Hubei University of Technology, Wuhan 430068, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chong","family":"Lu","sequence":"additional","affiliation":[{"name":"School of Science, Hubei University of Technology, Wuhan 430068, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xingjuan","family":"Song","sequence":"additional","affiliation":[{"name":"School of Science, Hubei University of Technology, Wuhan 430068, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lingyun","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Science, Hubei University of Technology, Wuhan 430068, China"},{"name":"Hubei Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System, Hubei University of Technology, Wuhan 430068, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0708-828X","authenticated-orcid":false,"given":"Ying","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Science, Hubei University of Technology, Wuhan 430068, China"},{"name":"Hubei Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System, Hubei University of Technology, Wuhan 430068, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,4,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"110575","DOI":"10.1016\/j.measurement.2021.110575","article-title":"Recent advances in MXene-based sensors for Structural Health Monitoring applications: A review","volume":"189","author":"Grabowski","year":"2022","journal-title":"Measurement"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"100527","DOI":"10.1016\/j.mtphys.2021.100527","article-title":"Two-dimensional transition metal carbides and\/or nitrides (MXenes) and their applications in sensors","volume":"21","author":"Qin","year":"2021","journal-title":"Mater. 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