Atomistic Descriptions of Gas-Surface Interactions on Tin Dioxide
Historically, in gas sensing literature, the focus on “mechanisms” has been on oxygen species chemisorbed (ionosorbed) from the ambient atmosphere, but what these species actually represent and the location of the adsorption site on the surface of the solid are typically not well described. Recent a...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-09-01
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| Series: | Chemosensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2227-9040/9/9/270 |
| _version_ | 1797519858234032128 |
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| author | Stefan Kucharski Chris Blackman |
| author_facet | Stefan Kucharski Chris Blackman |
| author_sort | Stefan Kucharski |
| collection | DOAJ |
| description | Historically, in gas sensing literature, the focus on “mechanisms” has been on oxygen species chemisorbed (ionosorbed) from the ambient atmosphere, but what these species actually represent and the location of the adsorption site on the surface of the solid are typically not well described. Recent advances in computational modelling and experimental surface science provide insights on the likely mechanism by which oxygen and other species interact with the surface of SnO<sub>2</sub>, providing insight into future directions for materials design and optimisation. This article reviews the proposed models of adsorption and reaction of oxygen on SnO<sub>2</sub>, including a summary of conventional evidence for oxygen ionosorption and recent operando spectroscopy studies of the atomistic interactions on the surface. The analysis is extended to include common target and interfering reducing gases, such as CO and H<sub>2</sub>, cross-interactions with H<sub>2</sub>O vapour, and NO<sub>2</sub> as an example of an oxidising gas. We emphasise the importance of the surface oxygen vacancies as both the preferred adsorption site of many gases and in the self-doping mechanism of SnO<sub>2</sub>. |
| first_indexed | 2024-03-10T07:48:44Z |
| format | Article |
| id | doaj.art-c3891f08d9e34b4f92736cff6b7b321b |
| institution | Directory Open Access Journal |
| issn | 2227-9040 |
| language | English |
| last_indexed | 2024-03-10T07:48:44Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Chemosensors |
| spelling | doaj.art-c3891f08d9e34b4f92736cff6b7b321b2023-11-22T12:28:57ZengMDPI AGChemosensors2227-90402021-09-019927010.3390/chemosensors9090270Atomistic Descriptions of Gas-Surface Interactions on Tin DioxideStefan Kucharski0Chris Blackman1Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UKDepartment of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UKHistorically, in gas sensing literature, the focus on “mechanisms” has been on oxygen species chemisorbed (ionosorbed) from the ambient atmosphere, but what these species actually represent and the location of the adsorption site on the surface of the solid are typically not well described. Recent advances in computational modelling and experimental surface science provide insights on the likely mechanism by which oxygen and other species interact with the surface of SnO<sub>2</sub>, providing insight into future directions for materials design and optimisation. This article reviews the proposed models of adsorption and reaction of oxygen on SnO<sub>2</sub>, including a summary of conventional evidence for oxygen ionosorption and recent operando spectroscopy studies of the atomistic interactions on the surface. The analysis is extended to include common target and interfering reducing gases, such as CO and H<sub>2</sub>, cross-interactions with H<sub>2</sub>O vapour, and NO<sub>2</sub> as an example of an oxidising gas. We emphasise the importance of the surface oxygen vacancies as both the preferred adsorption site of many gases and in the self-doping mechanism of SnO<sub>2</sub>.https://www.mdpi.com/2227-9040/9/9/270SnO<sub>2</sub>sensormechanismoperandospectroscopyadsorbates |
| spellingShingle | Stefan Kucharski Chris Blackman Atomistic Descriptions of Gas-Surface Interactions on Tin Dioxide Chemosensors SnO<sub>2</sub> sensor mechanism operando spectroscopy adsorbates |
| title | Atomistic Descriptions of Gas-Surface Interactions on Tin Dioxide |
| title_full | Atomistic Descriptions of Gas-Surface Interactions on Tin Dioxide |
| title_fullStr | Atomistic Descriptions of Gas-Surface Interactions on Tin Dioxide |
| title_full_unstemmed | Atomistic Descriptions of Gas-Surface Interactions on Tin Dioxide |
| title_short | Atomistic Descriptions of Gas-Surface Interactions on Tin Dioxide |
| title_sort | atomistic descriptions of gas surface interactions on tin dioxide |
| topic | SnO<sub>2</sub> sensor mechanism operando spectroscopy adsorbates |
| url | https://www.mdpi.com/2227-9040/9/9/270 |
| work_keys_str_mv | AT stefankucharski atomisticdescriptionsofgassurfaceinteractionsontindioxide AT chrisblackman atomisticdescriptionsofgassurfaceinteractionsontindioxide |