Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
Center for Materials Research, SUSTech (Jiaxing) Research Institute, Jiaxing 314011, China.
ACS Sens. 2024 Aug 23;9(8):3979-3985. doi: 10.1021/acssensors.4c00749. Epub 2024 Aug 2.
Metal oxide gas sensors (MOGS), crucial components in monitoring air quality and detecting hazardous gases, are well known for their poisoning effects when exposed to certain gas molecules, such as hydrogen sulfide. Surprisingly, our research reveals that high-temperature HS treatment leads to an enhancement effect rather than response decay. This study investigates the time-decaying response enhancement, being attributed to the formation of metal sulfide and metal sulfate on the metal oxide's surface, enhancing the electronic sensitization. Such an enhancement effect is demonstrated for various gases, including CO, CHCHOH, CH, HCHO, and NH. Additionally, the impacts of HS treatment on the response and recovery time are also observed. Surface compositional analysis are conducted with X-ray photoelectron spectroscopy. A proposed mechanism for the enhancement effect is elaborated, highlighting the role of electronic sensitization and the sulfide-sulfate component. This research offers valuable insights into the potential applications of metal oxide sensors in sulfide-presented harsh environments in gas sensing, encouraging future exploration of optimized sensor materials, operation temperature, and the development of hydrogen sulfide poisoning-resistant and higher sensitivity MOGS.
金属氧化物气体传感器（MOGS）是监测空气质量和检测有害气体的关键组件，众所周知，它们在暴露于某些气体分子（如硫化氢）时会产生中毒效应。令人惊讶的是，我们的研究表明，高温 HS 处理会导致增强效应而不是响应衰减。本研究调查了时间衰减响应增强的现象，这归因于金属氧化物表面上金属硫化物和金属硫酸盐的形成，增强了电子敏化作用。这种增强效应在各种气体中都得到了证明，包括 CO、CHCHOH、CH、HCHO 和 NH。此外，还观察了 HS 处理对响应和恢复时间的影响。通过 X 射线光电子能谱进行了表面成分分析。阐述了增强效应的机理，强调了电子敏化和硫化物-硫酸盐成分的作用。这项研究为金属氧化物传感器在气体传感中存在硫化物的恶劣环境中的潜在应用提供了有价值的见解，鼓励未来探索优化的传感器材料、操作温度，以及开发抗硫化氢中毒和更高灵敏度的 MOGS。
