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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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/15/1/25 |
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| Summary: | 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. |
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| ISSN: | 2079-4991 |