Dan Meng, Li Ma, Lei Zhang, Xiaoguang San, Zongsheng Xie, Quan Jin, Jian Qi
{"title":"Oxygen vacancy and interface effect dual modulation of SnS<sub>2</sub>/SnO<sub>2</sub> heterojunction for boosting formaldehyde detection at low temperature.","authors":"Dan Meng, Li Ma, Lei Zhang, Xiaoguang San, Zongsheng Xie, Quan Jin, Jian Qi","doi":"10.1016/j.talanta.2025.127586","DOIUrl":null,"url":null,"abstract":"<p><p>Formaldehyde (HCHO) is a harmful volatile organic pollutant, which is commonly found in interior decoration and furniture products. Therefore, it is necessary to develop a gas sensor that can quickly and accurately detect formaldehyde for human health and environmental protection. In order to achieve this goal, in this work, SnS<sub>2</sub>/SnO<sub>2</sub> heterostructure was synthesized by in-situ sulfurization process on the basis of SnO<sub>2</sub> nanospheres, and its formaldehyde sensing performance was studied. After testing, it was found that the gas sensor based on SnS<sub>2</sub>/SnO<sub>2</sub> heterojunction has more excellent gas sensing performance than pure SnO<sub>2</sub> gas sensor at the same operating temperature (100 °C). Specifically, SnS<sub>2</sub>/SnO<sub>2</sub>-2 (Sn:S = 3:2) has the advantages of high sensitivity (4.01 at 0.1 ppm), excellent selectivity, low theoretical detection limit (13.26 ppb), good humidity resistance and long-term stability. The excellent sensing performance of SnS<sub>2</sub>/SnO<sub>2</sub> sensors for formaldehyde detection is mainly attributed to the n-n heterojunction formed by SnS<sub>2</sub> and SnO<sub>2</sub>, which generates a built-in electric field to accelerate the electron transport in the material, the higher oxygen vacancy sites adsorb a large number of reactive gas molecules to promote the oxidation of formaldehyde molecules, and the unique porous structure to promote the transmission and diffusion of gases and increase the surface area to provide more adsorption sites and reactive centers for gas molecules. Therefore, the construction of SnS<sub>2</sub>/SnO<sub>2</sub> heterostructures will be an effective way to develop next-generation formaldehyde gas sensors with higher sensing performance.</p>","PeriodicalId":435,"journal":{"name":"Talanta","volume":"286 ","pages":"127586"},"PeriodicalIF":5.6000,"publicationDate":"2025-05-01","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.2025.127586","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/1/13 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Formaldehyde (HCHO) is a harmful volatile organic pollutant, which is commonly found in interior decoration and furniture products. Therefore, it is necessary to develop a gas sensor that can quickly and accurately detect formaldehyde for human health and environmental protection. In order to achieve this goal, in this work, SnS2/SnO2 heterostructure was synthesized by in-situ sulfurization process on the basis of SnO2 nanospheres, and its formaldehyde sensing performance was studied. After testing, it was found that the gas sensor based on SnS2/SnO2 heterojunction has more excellent gas sensing performance than pure SnO2 gas sensor at the same operating temperature (100 °C). Specifically, SnS2/SnO2-2 (Sn:S = 3:2) has the advantages of high sensitivity (4.01 at 0.1 ppm), excellent selectivity, low theoretical detection limit (13.26 ppb), good humidity resistance and long-term stability. The excellent sensing performance of SnS2/SnO2 sensors for formaldehyde detection is mainly attributed to the n-n heterojunction formed by SnS2 and SnO2, which generates a built-in electric field to accelerate the electron transport in the material, the higher oxygen vacancy sites adsorb a large number of reactive gas molecules to promote the oxidation of formaldehyde molecules, and the unique porous structure to promote the transmission and diffusion of gases and increase the surface area to provide more adsorption sites and reactive centers for gas molecules. Therefore, the construction of SnS2/SnO2 heterostructures will be an effective way to develop next-generation formaldehyde gas sensors with higher sensing performance.
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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