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Direct in situ spectroscopic evidence of the crucial role played by surface oxygen vacancies in the O2-sensing mechanism of SnO2
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Kucharski, Stefan, Ferrer, Pilar, Venturini, Federica, Held, Georg, Walton, Alex S., Byrne, Conor, Covington, James A., Ayyala, Sai Kiran, Beale, Andrew M. and Blackman, Chris (2022) Direct in situ spectroscopic evidence of the crucial role played by surface oxygen vacancies in the O2-sensing mechanism of SnO2. Chemical Science, 13 (20). pp. 6089-6097. doi:10.1039/d2sc01738e ISSN 2041-6520.
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WRAP-direct-in-situ-spectroscopic-evidence-crucial-role-played-surface-oxygen-vacancies-O2-sensing-mechanism-SnO2-Covington-2022.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution. Download (1790Kb) | Preview |
Official URL: https://doi.org/10.1039/d2sc01738e
Abstract
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.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QC Physics Q Science > QD Chemistry T Technology > TP Chemical technology |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | |||||||||
| SWORD Depositor: | Library Publications Router | |||||||||
| Library of Congress Subject Headings (LCSH): | Gas detectors -- Research, Oxygen, Synchrotron radiation, Stoichiometry | |||||||||
| Journal or Publication Title: | Chemical Science | |||||||||
| Publisher: | Royal Society of Chemistry | |||||||||
| ISSN: | 2041-6520 | |||||||||
| Official Date: | 28 May 2022 | |||||||||
| Dates: |
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| Volume: | 13 | |||||||||
| Number: | 20 | |||||||||
| Page Range: | pp. 6089-6097 | |||||||||
| DOI: | 10.1039/d2sc01738e | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Open Access (Creative Commons) | |||||||||
| Date of first compliant deposit: | 8 June 2022 | |||||||||
| Date of first compliant Open Access: | 9 June 2022 | |||||||||
| RIOXX Funder/Project Grant: |
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