Elger, Ann-Kathrin ; Baranyai, Julian ; Hofmann, Kathrin ; Hess, Christian (2024)
Direct Operando Spectroscopic Observation of Oxygen Vacancies in Working Ceria-Based Gas Sensors.
In: ACS Sensors, 2019, 4 (6)
doi: 10.26083/tuprints-00028251
Artikel, Zweitveröffentlichung, Postprint
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Kurzbeschreibung (Abstract)
Metal-oxide semiconductors are of great interest for gas-sensing applications. We provide new insights into the mode of operation of ceria-based gas sensors during ethanol gas sensing using combined operando Raman–gas-phase FTIR spectroscopy. Visible Raman spectroscopy is employed to monitor the presence of oxygen vacancies in ceria via F₂g mode softening, while simultaneously recorded FTIR spectra capture the gas-phase composition. Such an experimental approach allowing the direct observation of oxygen vacancies in metal-oxide gas sensors has not been reported in the literature. By systematically varying the gas atmosphere and temperature, we can relate the sensor response to the spectroscopic signals, enabling us to obtain new fundamental insight into the functioning of metal-oxide semiconductor gas sensors, as well as their differences from heterogeneous catalysts.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Elger, Ann-Kathrin ; Baranyai, Julian ; Hofmann, Kathrin ; Hess, Christian |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Direct Operando Spectroscopic Observation of Oxygen Vacancies in Working Ceria-Based Gas Sensors |
| Sprache: | Englisch |
| Publikationsjahr: | 29 Oktober 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 22 Mai 2019 |
| Ort der Erstveröffentlichung: | Washington, DC |
| Verlag: | American Chemical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | ACS Sensors |
| Jahrgang/Volume einer Zeitschrift: | 4 |
| (Heft-)Nummer: | 6 |
| Kollation: | 16 Seiten |
| DOI: | 10.26083/tuprints-00028251 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/28251 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichungsservice |
| Kurzbeschreibung (Abstract): | Metal-oxide semiconductors are of great interest for gas-sensing applications. We provide new insights into the mode of operation of ceria-based gas sensors during ethanol gas sensing using combined operando Raman–gas-phase FTIR spectroscopy. Visible Raman spectroscopy is employed to monitor the presence of oxygen vacancies in ceria via F₂g mode softening, while simultaneously recorded FTIR spectra capture the gas-phase composition. Such an experimental approach allowing the direct observation of oxygen vacancies in metal-oxide gas sensors has not been reported in the literature. By systematically varying the gas atmosphere and temperature, we can relate the sensor response to the spectroscopic signals, enabling us to obtain new fundamental insight into the functioning of metal-oxide semiconductor gas sensors, as well as their differences from heterogeneous catalysts. |
| Freie Schlagworte: | oxygen vacancies, gas sensors, operando, ceria, gold, mechanisms |
| Status: | Postprint |
| URN: | urn:nbn:de:tuda-tuprints-282511 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Fachbereich(e)/-gebiet(e): | 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Physikalische Chemie |
| Hinterlegungsdatum: | 29 Okt 2024 13:34 |
| Letzte Änderung: | 30 Okt 2024 09:09 |
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