TiO<sub>2</sub> Nanosphere/MoSe<sub>2</sub> Nanosheet-Based Heterojunction Gas Sensor for High-Sensitivity Sulfur Dioxide Detection
With the growing severity of air pollution, monitoring harmful gases that pose risks to both human health and the ecological environment has become a focal point of research. Titanium dioxide (TiO<sub>2</sub>) demonstrates significant potential for application in SO<sub>2</sub&g...
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MDPI AG
2024-12-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/15/1/25 |
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| author | Lanjuan Zhou Chang Niu Tian Wang Hao Zhang Gongao Jiao Dongzhi Zhang |
| author_facet | Lanjuan Zhou Chang Niu Tian Wang Hao Zhang Gongao Jiao Dongzhi Zhang |
| author_sort | Lanjuan Zhou |
| collection | DOAJ |
| description | With the growing severity of air pollution, monitoring harmful gases that pose risks to both human health and the ecological environment has become a focal point of research. Titanium dioxide (TiO<sub>2</sub>) demonstrates significant potential for application in SO<sub>2</sub> gas detection. However, the performance of pure TiO<sub>2</sub> is limited. In this study, TiO<sub>2</sub> nanospheres and MoSe<sub>2</sub> nanosheets were synthesized using a hydrothermal method, and the gas-sensing properties of TiO<sub>2</sub>/MoSe<sub>2</sub> nanostructures for SO<sub>2</sub> detection were investigated. The TiO<sub>2</sub>/MoSe<sub>2</sub> composites (with a TiO<sub>2</sub>-to-MoSe<sub>2</sub> volume ratio of 2:1) were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). The TiO<sub>2</sub>/MoSe<sub>2</sub> sensor exhibited high sensitivity to SO<sub>2</sub>; the response to 100 ppm of SO<sub>2</sub> reached as high as 59.3, with a significantly shorter response and recovery time (15 s/13 s), as well as excellent repeatability, selectivity, and long-term stability. The experimental results suggest that the enhanced SO<sub>2</sub> adsorption capacity of the TiO<sub>2</sub>/MoSe<sub>2</sub> composite can be attributed to the formation of an n-n heterojunction and the unique microstructural features of TiO<sub>2</sub>/MoSe<sub>2</sub>. Therefore, the TiO<sub>2</sub>/MoSe<sub>2</sub> sensor represents a promising candidate for rapid SO<sub>2</sub> detection, providing a theoretical foundation for the development and application of high-performance SO<sub>2</sub> sensors. |
| format | Article |
| id | doaj-art-294c1c4d65894b57be8caa8a469b6525 |
| institution | Kabale University |
| issn | 2079-4991 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj-art-294c1c4d65894b57be8caa8a469b65252025-01-10T13:19:17ZengMDPI AGNanomaterials2079-49912024-12-011512510.3390/nano15010025TiO<sub>2</sub> Nanosphere/MoSe<sub>2</sub> Nanosheet-Based Heterojunction Gas Sensor for High-Sensitivity Sulfur Dioxide DetectionLanjuan Zhou0Chang Niu1Tian Wang2Hao Zhang3Gongao Jiao4Dongzhi Zhang5State Key Laboratory of Chemical Safety, College of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaState Key Laboratory of Chemical Safety, College of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaState Key Laboratory of Chemical Safety, College of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaState Key Laboratory of Chemical Safety, College of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaState Key Laboratory of Chemical Safety, College of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaState Key Laboratory of Chemical Safety, College of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaWith the growing severity of air pollution, monitoring harmful gases that pose risks to both human health and the ecological environment has become a focal point of research. Titanium dioxide (TiO<sub>2</sub>) demonstrates significant potential for application in SO<sub>2</sub> gas detection. However, the performance of pure TiO<sub>2</sub> is limited. In this study, TiO<sub>2</sub> nanospheres and MoSe<sub>2</sub> nanosheets were synthesized using a hydrothermal method, and the gas-sensing properties of TiO<sub>2</sub>/MoSe<sub>2</sub> nanostructures for SO<sub>2</sub> detection were investigated. The TiO<sub>2</sub>/MoSe<sub>2</sub> composites (with a TiO<sub>2</sub>-to-MoSe<sub>2</sub> volume ratio of 2:1) were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). The TiO<sub>2</sub>/MoSe<sub>2</sub> sensor exhibited high sensitivity to SO<sub>2</sub>; the response to 100 ppm of SO<sub>2</sub> reached as high as 59.3, with a significantly shorter response and recovery time (15 s/13 s), as well as excellent repeatability, selectivity, and long-term stability. The experimental results suggest that the enhanced SO<sub>2</sub> adsorption capacity of the TiO<sub>2</sub>/MoSe<sub>2</sub> composite can be attributed to the formation of an n-n heterojunction and the unique microstructural features of TiO<sub>2</sub>/MoSe<sub>2</sub>. Therefore, the TiO<sub>2</sub>/MoSe<sub>2</sub> sensor represents a promising candidate for rapid SO<sub>2</sub> detection, providing a theoretical foundation for the development and application of high-performance SO<sub>2</sub> sensors.https://www.mdpi.com/2079-4991/15/1/25SO<sub>2</sub> sensorhydrothermal methodTiO<sub>2</sub>/MoSe<sub>2</sub> compositesheterojunction |
| spellingShingle | Lanjuan Zhou Chang Niu Tian Wang Hao Zhang Gongao Jiao Dongzhi Zhang TiO<sub>2</sub> Nanosphere/MoSe<sub>2</sub> Nanosheet-Based Heterojunction Gas Sensor for High-Sensitivity Sulfur Dioxide Detection Nanomaterials SO<sub>2</sub> sensor hydrothermal method TiO<sub>2</sub>/MoSe<sub>2</sub> composites heterojunction |
| title | TiO<sub>2</sub> Nanosphere/MoSe<sub>2</sub> Nanosheet-Based Heterojunction Gas Sensor for High-Sensitivity Sulfur Dioxide Detection |
| title_full | TiO<sub>2</sub> Nanosphere/MoSe<sub>2</sub> Nanosheet-Based Heterojunction Gas Sensor for High-Sensitivity Sulfur Dioxide Detection |
| title_fullStr | TiO<sub>2</sub> Nanosphere/MoSe<sub>2</sub> Nanosheet-Based Heterojunction Gas Sensor for High-Sensitivity Sulfur Dioxide Detection |
| title_full_unstemmed | TiO<sub>2</sub> Nanosphere/MoSe<sub>2</sub> Nanosheet-Based Heterojunction Gas Sensor for High-Sensitivity Sulfur Dioxide Detection |
| title_short | TiO<sub>2</sub> Nanosphere/MoSe<sub>2</sub> Nanosheet-Based Heterojunction Gas Sensor for High-Sensitivity Sulfur Dioxide Detection |
| title_sort | tio sub 2 sub nanosphere mose sub 2 sub nanosheet based heterojunction gas sensor for high sensitivity sulfur dioxide detection |
| topic | SO<sub>2</sub> sensor hydrothermal method TiO<sub>2</sub>/MoSe<sub>2</sub> composites heterojunction |
| url | https://www.mdpi.com/2079-4991/15/1/25 |
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