氧气
X射线光电子能谱
化学计量学
气相
化学物理
化学
同步辐射
分析化学(期刊)
材料科学
化学工程
物理化学
环境化学
光学
工程类
物理
有机化学
作者
Stefan Kucharski,Pilar Ferrer,Federica Venturini,Georg Held,Alex S. Walton,Conor Byrne,James A. Covington,Sai Kiran Ayyala,Andrew M. Beale,Christopher S. Blackman
出处
期刊:Chemical Science
[The Royal Society of Chemistry]
日期:2022-01-01
卷期号:13 (20): 6089-6097
被引量:7
摘要
Conductometric gas sensors (CGS) provide a reproducible gas response at a low cost but their operation mechanisms are still not fully understood. In this paper, we elucidate the nature of interactions between SnO2, a common gas-sensitive material, and O2, a ubiquitous gas central to the detection mechanisms of CGS. Using synchrotron radiation, we investigated a working SnO2 sensor under operando conditions via near-ambient pressure (NAP) XPS with simultaneous resistance measurements, and created a depth profile of the variable near-surface stoichiometry of SnO2-x as a function of O2 pressure. Our results reveal a correlation between the dynamically changing surface oxygen vacancies and the resistance response in SnO2-based CGS. While oxygen adsorbates were observed in this study we conclude that these are an intermediary in oxygen transport between the gas phase and the lattice, and that surface oxygen vacancies, not the observed oxygen adsorbates, are central to response generation in SnO2-based gas sensors.
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