Zhou Lanjuan, Niu Chang, Wang Tian, Zhang Hao, Jiao Gongao, Zhang Dongzhi
State Key Laboratory of Chemical Safety, College of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China.
Nanomaterials (Basel). 2024 Dec 27;15(1):25. doi: 10.3390/nano15010025.
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) demonstrates significant potential for application in SO gas detection. However, the performance of pure TiO is limited. In this study, TiO nanospheres and MoSe nanosheets were synthesized using a hydrothermal method, and the gas-sensing properties of TiO/MoSe nanostructures for SO detection were investigated. The TiO/MoSe composites (with a TiO-to-MoSe 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/MoSe sensor exhibited high sensitivity to SO; the response to 100 ppm of SO 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 adsorption capacity of the TiO/MoSe composite can be attributed to the formation of an n-n heterojunction and the unique microstructural features of TiO/MoSe. Therefore, the TiO/MoSe sensor represents a promising candidate for rapid SO detection, providing a theoretical foundation for the development and application of high-performance SO sensors.
随着空气污染日益严重，监测对人类健康和生态环境都构成风险的有害气体已成为研究的焦点。二氧化钛（TiO₂）在SO₂气体检测中显示出巨大的应用潜力。然而，纯TiO₂的性能有限。在本研究中，采用水热法合成了TiO₂纳米球和MoSe₂纳米片，并研究了TiO₂/MoSe₂纳米结构对SO₂的气敏性能。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）和X射线衍射（XRD）对TiO₂/MoSe₂复合材料（TiO₂与MoSe₂的体积比为2:1）进行了表征。TiO₂/MoSe₂传感器对SO₂表现出高灵敏度；对100 ppm SO₂的响应高达59.3，响应和恢复时间显著缩短（15 s/13 s），并且具有优异的重复性、选择性和长期稳定性。实验结果表明，TiO₂/MoSe₂复合材料对SO₂吸附能力的增强可归因于n-n异质结的形成以及TiO₂/MoSe₂独特的微观结构特征。因此，TiO₂/MoSe₂传感器是快速检测SO₂的有前途的候选者，为高性能SO₂传感器的开发和应用提供了理论基础。
