研制稳定可靠的氢气传感器件是发展氢能源安全检测技术的关键。针对半导体纳米线室温氢气传感器面临的基线漂移和疲劳失效问题，项目拟采用水热法生长取向和表面氧空位含量可调的正交相MoO3纳米线；利用球差校正透射电镜和气氛-加热样品台在原子尺度原位观测氢气对纳米线不同晶面和缺陷的作用，研究不同温湿度下纳米线表面原子结构和元素价态随氢气浓度的变化；结合第一性原理计算研究氢气的表面作用对纳米线表面电子结构的影响，探明真实工作条件下MoO3纳米线的氢气敏感机制，揭示纳米线微观结构和宏观氢敏性能的内在联系；设计并制备氢敏特性优异且稳定性良好的MoO3纳米线，组装纳米线有序阵列，研制性能稳定的半导体室温氢气传感器。项目的顺利实施，可为室温半导体氢气传感器的性能优化提供理论依据和实验基础，推动半导体氢气传感器在氢能安全检测领域的实际应用，对保障我国产氢用氢领域和未来氢能产业的安全发展具有重要意义。

Researches on stable and reilable hydrogen sensor is of great significance for the development of hydrogen energy safety monitoring techniques. Aiming at baseline-drifting and fatigue failure problem of semiconductor nanowire-based room-temperature hydrogen sensors, this project intends to synthesize orthorhombic MoO3 nanowires with different growth orientation and oxygen vacancy content by using hydrothermal method, and in-situ test the effect of hydrogen reaction on different facets and defects of the nanowires by using gas-involved Cs-correction transmission electron microscopy. The variation of micro-structure and element valence state of the nanowires with hydrogen concentration at different temperature and humidity conditions will be studied. The influence of hydrogen reaction on the nanowire surface on the electron structure will be studied by combining with the first principle calculation to reveal the mechanism of hydrogen sensing under real-time operation conditions, as well as the relationship between the microstructure and hydrogen sensing performance of the nanowires. Based on that, the MoO3 nanowires with outstanding hydrogen sensing properties and good stability will be designed and prepared, followed by the assembly of ordered nanowire arrays by using dielectrophoretic method, to develop the room-temperature semiconductor hydrogen sensors with fast and sensitive response as well as stable and reliable performance. The successful implementation of the project can provide theoretical and experimental information for the performance optimization of semiconductor room-temperature hydrogen sensors, which could promote their practical application in hydrogen safety monitoring fields and is of great significance for ensuring the safe development of China's traditional hydrogen production and application fields and the future hydrogen energy industry.