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NO2是一种有毒气体，能与空气中的其他有机化合物发生反应，造成空气污染并对人体有很大的危害。因此，需要一种气体传感器来检测NO2。然而，传统的NO2传感器很难在室温（25℃）下工作。本研究报告了SnS2/In2O3的室温（25℃）NO2气体传感。采用热注入法和水热法制备了In2O3量子点和SnS2纳米片。凭借SnS2独特的二维结构，在其上装饰In2O3，复合增强了其传感性能，产品采用X射线衍射（XRD）、扫描电子显微镜（SEM）、高分辨率透射电子显微镜（HR-TEM）和X射线光电子能谱仪（XPS）进行表征。结果表明，SnS2/In2O3传感器对1000 ppb NO2的响应为26.6，响应/恢复时间分别为146 s和243 s。由于异质结结构增加了活性位点的数量，加速了气体的传输，促进了电荷转移和气体解吸，提高了NO2气体传感性能。这种优异的传感性能在NO2检测中具有广阔的应用前景。
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关键词:
- 气体传感 /
- SnS2/In2O3 /
- NO2 /
- 室温
NO2 is a toxic gas that reacts with other organic compounds in the air, causing air pollution and posing a significant risk to humans. Therefore, a gas sensor is needed to detect NO2. However, conventional NO2 gas sensors are difficult to operate at room temperature (25℃). In this study, NO2 gas sensing by SnS2/In2O3 at room temperature (25℃) is reported. In2O3 quantum dots and SnS2 nanosheets were prepared by the hot-injection and hydrothermal methods. By virtue of the unique two-dimensional structure of SnS2, In2O3 was decorated on it, and the composite enhanced its sensing performance. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS). The results demonstrate that the composites prepared by 52% In2O3 exhibit the best sensing response. The fabricated sensor shows a response of 26.6 to 1000 ppb NO2, along with fast response and recovery times, respectively, at room temperature (25℃). Moreover, this sensor demonstrates excellent reproducibility and selectivity. The heterojunction structure increases the number of active sites and accelerates the gas transport, which promotes charge transfer and gas desorption to improve NO2 gas sensing performance. This excellent sensing performance has a great application prospect in NO2 detection.-
Keywords:
- Gas sensing /
- SnS2/In2O3 /
- NO2 /
- room temperature
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