{"title":"UV-activated gas sensor based on ordered mesoporous ZnO-TiO<sub>2</sub> heterogeneous composites for trace NO<sub>2</sub> detection at room temperature.","authors":"Yuan-Yuan Guo, Xiao-Hong Zheng, Liang-Bo Bo, Zi-Qi Gu, Cheng Zhang, Yu-Feng Liu","doi":"10.1016/j.talanta.2024.127415","DOIUrl":null,"url":null,"abstract":"<p><p>The growing modern industry has promoted the development of gas sensors for environmental monitoring and safety checks. However, the traditional chemical resistance gas sensor still has some disadvantages such as high power consumption and limited detection, mainly due to the lack of charge transfer ability of sensing materials. In this paper, an ordered UV-activated gas sensor with mesoporous ZnO/TiO<sub>2</sub> nanotube composite was prepared by precisely controlling the growth of ZnO on the inner wall of TiO<sub>2</sub> nanotube. Based on the synergistic effect of Knudsen diffusion, photoactivation, and in situ heterojunction amplification, the charge transfer performance under room temperature of ZnO/TiO<sub>2</sub> nanotube composites is improved. Compared to TiO<sub>2</sub> nanotube sensor, the ZnO/TiO<sub>2</sub> sensor has a 10-fold enhanced response to NO<sub>2</sub>, and the detection limit is as low as 50 ppb. Moreover, we studied the performance of ZnO/TiO<sub>2</sub> sensor on NO<sub>2</sub> in campus, street entrance and chemical plant, and comparing with commercial sensor, found that the detection error and detection limit of our sensor is lower, which proves the sensor has great application prospect in practical detection. This work provides a successful method for in-situ construction of ordered mesoporous materials and gives a solution for the design of advanced photoelectric gas sensors.</p>","PeriodicalId":435,"journal":{"name":"Talanta","volume":"285 ","pages":"127415"},"PeriodicalIF":5.6000,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Talanta","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1016/j.talanta.2024.127415","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2024/12/22 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The growing modern industry has promoted the development of gas sensors for environmental monitoring and safety checks. However, the traditional chemical resistance gas sensor still has some disadvantages such as high power consumption and limited detection, mainly due to the lack of charge transfer ability of sensing materials. In this paper, an ordered UV-activated gas sensor with mesoporous ZnO/TiO2 nanotube composite was prepared by precisely controlling the growth of ZnO on the inner wall of TiO2 nanotube. Based on the synergistic effect of Knudsen diffusion, photoactivation, and in situ heterojunction amplification, the charge transfer performance under room temperature of ZnO/TiO2 nanotube composites is improved. Compared to TiO2 nanotube sensor, the ZnO/TiO2 sensor has a 10-fold enhanced response to NO2, and the detection limit is as low as 50 ppb. Moreover, we studied the performance of ZnO/TiO2 sensor on NO2 in campus, street entrance and chemical plant, and comparing with commercial sensor, found that the detection error and detection limit of our sensor is lower, which proves the sensor has great application prospect in practical detection. This work provides a successful method for in-situ construction of ordered mesoporous materials and gives a solution for the design of advanced photoelectric gas sensors.
期刊介绍：
Talanta provides a forum for the publication of original research papers, short communications, and critical reviews in all branches of pure and applied analytical chemistry. Papers are evaluated based on established guidelines, including the fundamental nature of the study, scientific novelty, substantial improvement or advantage over existing technology or methods, and demonstrated analytical applicability. Original research papers on fundamental studies, and on novel sensor and instrumentation developments, are encouraged. Novel or improved applications in areas such as clinical and biological chemistry, environmental analysis, geochemistry, materials science and engineering, and analytical platforms for omics development are welcome.
Analytical performance of methods should be determined, including interference and matrix effects, and methods should be validated by comparison with a standard method, or analysis of a certified reference material. Simple spiking recoveries may not be sufficient. The developed method should especially comprise information on selectivity, sensitivity, detection limits, accuracy, and reliability. However, applying official validation or robustness studies to a routine method or technique does not necessarily constitute novelty. Proper statistical treatment of the data should be provided. Relevant literature should be cited, including related publications by the authors, and authors should discuss how their proposed methodology compares with previously reported methods.
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