Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China; College of Science, China University of Petroleum (East China), Qingdao 266580, China.
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
J Hazard Mater. 2022 Feb 15;424(Pt D):127734. doi: 10.1016/j.jhazmat.2021.127734. Epub 2021 Nov 20.
Metal oxide semiconductor (MOSs) are attractive materials for the development of HS gas sensors. However, detecting HS with short response and recovery times while also lowering the limit of detection to sub-ppb levels remains a significant challenge. We therefore developed flower-like α-BiMoO microspheres for HS gas detection that provide fast response and recovery times (3 and 22 s, respectively, for 100 ppm HS), while also reducing the limit of detection to 1 ppb. The sensor performs well in terms of sensitivity, reproducibility, long-term stability, including humidity stability. X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations revealed that HS dissociates readily on the reduced α-BiMoO surface and that Mo plays a catalytic role, accelerating the rate of HS decomposition and enabling a fast response. Moreover, test strips containing α-BiMoO were also prepared, which enabled the naked eye detection of ppm-level HS gas at room temperature; a light-yellow to orange to brown color change occurs when exposed to HS, due to its conversion into stable sulfides. This work expands the application of α-BiMoO to HS gas sensing, and provides a strategy for the use of MOSs as sensor materials for the detection of other gases.
金属氧化物半导体（MOSs）是开发 HS 气体传感器的有吸引力的材料。然而，检测具有短响应和恢复时间的 HS，同时将检测限降低到亚 ppb 水平仍然是一个重大挑战。因此，我们开发了用于 HS 气体检测的花状α-BiMoO 微球，其响应和恢复时间分别为 3 和 22 s（对于 100 ppm 的 HS），同时将检测限降低到 1 ppb。该传感器在灵敏度、重现性、长期稳定性（包括湿度稳定性）方面表现良好。X 射线光电子能谱（XPS）和密度泛函理论（DFT）计算表明，HS 很容易在还原的α-BiMoO 表面上解离，并且 Mo 起到催化作用，加速 HS 分解的速率，从而实现快速响应。此外，还制备了含有α-BiMoO 的测试条，其能够在室温下肉眼检测到 ppm 级别的 HS 气体；当暴露于 HS 时，由于其转化为稳定的硫化物，颜色会从浅黄色变为橙色再变为棕色。这项工作将α-BiMoO 的应用扩展到 HS 气体传感领域，并为使用 MOSs 作为其他气体检测的传感器材料提供了一种策略。
