Noble Metal-Loaded WO<sub>3</sub>-Based Gases—The Gold Anomaly
Tungsten oxide is one of the most commonly used materials for metal oxide-based gas sensors. In order to tune the sensing behavior, small clusters of noble metals are often added to the surface of WO<sub>3</sub>. Previously, it has been found that in the case of oxidized metal clusters,...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-04-01
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| Series: | Proceedings |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2504-3900/97/1/206 |
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| Summary: | Tungsten oxide is one of the most commonly used materials for metal oxide-based gas sensors. In order to tune the sensing behavior, small clusters of noble metals are often added to the surface of WO<sub>3</sub>. Previously, it has been found that in the case of oxidized metal clusters, e.g., Rh and Pt additives, the Fermi-level pinning mechanism dominates. Unlike other noble metal surface clusters, gold seems to remain metallic under sensor operation. As a result, the behavior of WO<sub>3</sub>-based sensors was found to be significantly enhanced for all reducing gases and decreased for NO<sub>2</sub>. |
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| ISSN: | 2504-3900 |