{"title":"Development of a high property acetone sensor based on TiO2 core-shell spheres and their sensing mechanism analysis","authors":"Bao-Quan Yang, Xiao-Li Cheng, Xin Zhao, Xian-Fa Zhang, Chuan-Yu Guo, Li-Hua Huo, Ting-Ting Wang, Chao-Bo Huang, Zoltán Major, Ying-Ming Xu","doi":"10.1007/s12598-024-02991-4","DOIUrl":null,"url":null,"abstract":"<p>Acetone is a common volatile organic compound that can cause harm to human health when inhaled in small amounts. Therefore, the development of fast response and low detection limit acetone sensors becomes crucial. In this study, a core-shell spherical TiO<sub>2</sub> sensor with a rich pore structure was designed. This sensor exhibited excellent sensing properties, including higher responsiveness (100 ppm acetone, <i>R</i><sub>a</sub>/<i>R</i><sub>g</sub> = 80), lower detection limit (10 ppb) and short response time (8 s). The problem is that the sensing mechanism between TiO<sub>2</sub> and acetone is not thoroughly analyzed. To gain further insight, the interaction process of TiO<sub>2</sub> core-shell spheres and acetone under varying oxygen content environments was investigated by dynamic testing, X-ray photoelectron spectroscopy, in-situ Fourier transform infrared spectroscopy and gas chromatography-mass spectrometry. The research results show that acetone not only adsorbs on the surface of the material and reacts with adsorbed oxygen, but also undergoes catalytic oxidation reaction with TiO<sub>2</sub> core-shell spheres. Significantly, in high oxygen content environments, acetone undergoes oxidation to form intermediates such as acids and anhydrides that are difficult to desorpt on the surface of the material, thus prolonging the recovery time of the sensor. The discovery of this sensing process will provide some guidance for the design of acetone sensing materials in the future. Meanwhile, this also imparts valuable references and insights for the investigation of the mechanism and application of other sensitive metal oxide materials.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\n","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"8 1","pages":""},"PeriodicalIF":9.6000,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Rare Metals","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s12598-024-02991-4","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Acetone is a common volatile organic compound that can cause harm to human health when inhaled in small amounts. Therefore, the development of fast response and low detection limit acetone sensors becomes crucial. In this study, a core-shell spherical TiO2 sensor with a rich pore structure was designed. This sensor exhibited excellent sensing properties, including higher responsiveness (100 ppm acetone, Ra/Rg = 80), lower detection limit (10 ppb) and short response time (8 s). The problem is that the sensing mechanism between TiO2 and acetone is not thoroughly analyzed. To gain further insight, the interaction process of TiO2 core-shell spheres and acetone under varying oxygen content environments was investigated by dynamic testing, X-ray photoelectron spectroscopy, in-situ Fourier transform infrared spectroscopy and gas chromatography-mass spectrometry. The research results show that acetone not only adsorbs on the surface of the material and reacts with adsorbed oxygen, but also undergoes catalytic oxidation reaction with TiO2 core-shell spheres. Significantly, in high oxygen content environments, acetone undergoes oxidation to form intermediates such as acids and anhydrides that are difficult to desorpt on the surface of the material, thus prolonging the recovery time of the sensor. The discovery of this sensing process will provide some guidance for the design of acetone sensing materials in the future. Meanwhile, this also imparts valuable references and insights for the investigation of the mechanism and application of other sensitive metal oxide materials.
期刊介绍：
Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.
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