在现场PL跟踪在基于NO2的气体传感器中氧气缺陷的演变和功能
Jinglong Bai1, Linfu Xie2, Chao Chen2
1School of Science, Lanzhou University of Technology, Lanzhou 730000, China.
ACS sensors
|August 7, 2025
概括
用Ho/Pr兴奋剂调节氧化物 (In2O3) 纳米片中的氧气缺陷,可显著增强NO2气体传感. 这项研究揭示了氧气空缺增加了传感器响应,而间歇氧气抑制了它,提高了性能和选择性.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 化学传感器 化学传感器
背景情况:
- 氧缺陷,如氧空缺 (VO••) 和间歇氧 (Oi′′),极大地影响金属氧化物半导体的气体感应特性.
- 在气体检测过程中了解这些缺陷的精确作用对于推进基于金属氧化物半导体 (MOS) 的气体传感器至关重要.
研究的目的:
- 研究氧缺陷在调节氧化物 (In2O3) 纳米板的气体感应性能方面的内在作用.
- 通过Ho/Pr兴奋剂增强In2O3的NO2气体传感能力,并将缺陷演变与传感器响应相关联.
主要方法:
- 通过热水方法合成原始的In2O3单晶多孔纳米板.
- 使用Ho/Pr单一和二进制兴奋剂对氧缺陷的调制.
- 实时跟踪氧气缺陷在气体反应过程中的演变,使用现场光发射 (PL).
- 对NO2检测的气体传感性能评估.
主要成果:
- 与原始的In2O3相比,与Ho/Pr合的In2O3气体传感器对10ppmNO2 (从8.5到37.5) 的反应显著增强,相比In2O3.
- 被杂的传感器显示了更低的功耗,更好的稳定性和更高的选择性.
- 在现场,PL证实氧气空缺 (VO•••) 促进了离子吸收氧气,而间歇性氧气 (Oi′′) 则抑制了它.
- 在传感器响应和氧气空缺度之间建立了直接的正相关性.
结论:
- Ho/Pr 兴奋剂有效调节了 In2O3纳米薄膜中的氧气缺陷,从而产生了优越的 NO2气体传感性能.
- 氧气空缺在气体感应机制中起着关键的促进作用,而间歇氧气则具有抑制作用.
- 这项工作提供了对缺陷工程金属氧化物气体传感器的基本见解,为改进设备设计和性能铺平了道路.
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