SMOX Gas Sensor Characterization of Classical Polycrystalline SnO2 Materials at Room Temperature and Spectroscopic Analysis of Their Time Dependent Performance Degradation

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dc.contributor.advisor Weimar, Udo (Prof. Dr.)
dc.contributor.author Sackmann, André David
dc.date.accessioned 2025-07-09T13:16:20Z
dc.date.available 2025-07-09T13:16:20Z
dc.date.issued 2025-07-09
dc.identifier.uri http://hdl.handle.net/10900/167748
dc.identifier.uri http://nbn-resolving.org/urn:nbn:de:bsz:21-dspace-1677487 de_DE
dc.identifier.uri http://dx.doi.org/10.15496/publikation-109075
dc.description.abstract This work examines a specific aspect of gas sensing with metal oxide semiconductor materials – namely, their operation at temperatures well below the conventional 200°C – 400°C range. The benefits of an ideally unheated sensor are clear: minimal power consumption, elimination of the heating element (enabling further miniaturization), and reduced costs. Known drawbacks of an unheated sensor that must be addressed include slow response and recovery times, often lower signal strength, and long term stability issues. The metal oxides investigated are tin dioxide variants prepared at different calcination temperatures and functionalized with palladium and platinum. The methods employed include DC resistance measurements for sensor characterization, as well as “operando” techniques like infrared spectroscopy of the sensor surface. A progressive degradation of initially strong sensor responses to hydrogen and carbon monoxide was observed following the final thermal treatment. Spectroscopic measurements reveal rapid onset of water condensation on the surface and a long term transformation of the oxides into less reactive molecular species. Experiments using temperature modulated operating modes demonstrate the potential and advantages of operating a sensor below the typical 300 °C threshold, while mitigating degradation through regular heating phases. en
dc.language.iso en de_DE
dc.publisher Universität Tübingen de_DE
dc.rights ubt-podok de_DE
dc.rights.uri http://tobias-lib.uni-tuebingen.de/doku/lic_mit_pod.php?la=de de_DE
dc.rights.uri http://tobias-lib.uni-tuebingen.de/doku/lic_mit_pod.php?la=en en
dc.subject.ddc 500 de_DE
dc.subject.ddc 540 de_DE
dc.title SMOX Gas Sensor Characterization of Classical Polycrystalline SnO2 Materials at Room Temperature and Spectroscopic Analysis of Their Time Dependent Performance Degradation en
dc.type PhDThesis de_DE
dcterms.dateAccepted 2025-06-04
utue.publikation.fachbereich Chemie de_DE
utue.publikation.fakultaet 7 Mathematisch-Naturwissenschaftliche Fakultät de_DE
utue.publikation.noppn yes de_DE

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