Pfeiffer, Maximilian Alexander ; Hess, Christian (2023)
Unraveling mechanistic differences in optical and electrical sensors: time-resolved operando UV-vis spectroscopy of P-type perovskite gas sensors.
In: The Journal of Physical Chemistry C, 127 (46)
doi: 10.1021/acs.jpcc.3c05195
Artikel, Bibliographie
Dies ist die neueste Version dieses Eintrags.
Kurzbeschreibung (Abstract)
To gain a deeper understanding of p-type chemiresistive and gasochromic sensor materials, LaFeO3 and SmFeO3 were investigated by using time-resolved operando UV–vis spectroscopy. A qualitative match in the electrical conductance and optical absorbance below the band edge was observed. The two properties are connected by changes in the electron hole concentration caused by the sensor surface reaction with ethanol, leading to a decrease in both conductance and free carrier absorption. Quantitative differences between the conductance and free carrier absorption behavior are explained based on surface effects caused by the surface band bending and surface adsorbates, which lead to significant changes in conductance but are only of minor importance for changes in the free carrier absorption. Our results demonstrate the potential of time-resolved operando UV–vis spectroscopy to develop a detailed mechanistic understanding of chemiresistive and gasochromic sensors by discriminating between surface and bulk effects and to combine their use for future gas sensor development.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Pfeiffer, Maximilian Alexander ; Hess, Christian |
| Art des Eintrags: | Bibliographie |
| Titel: | Unraveling mechanistic differences in optical and electrical sensors: time-resolved operando UV-vis spectroscopy of P-type perovskite gas sensors |
| Sprache: | Englisch |
| Publikationsjahr: | 9 November 2023 |
| Ort: | Washington, DC |
| Verlag: | ACS Publications |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | The Journal of Physical Chemistry C |
| Jahrgang/Volume einer Zeitschrift: | 127 |
| (Heft-)Nummer: | 46 |
| Kollation: | 7 Seiten |
| DOI: | 10.1021/acs.jpcc.3c05195 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | To gain a deeper understanding of p-type chemiresistive and gasochromic sensor materials, LaFeO3 and SmFeO3 were investigated by using time-resolved operando UV–vis spectroscopy. A qualitative match in the electrical conductance and optical absorbance below the band edge was observed. The two properties are connected by changes in the electron hole concentration caused by the sensor surface reaction with ethanol, leading to a decrease in both conductance and free carrier absorption. Quantitative differences between the conductance and free carrier absorption behavior are explained based on surface effects caused by the surface band bending and surface adsorbates, which lead to significant changes in conductance but are only of minor importance for changes in the free carrier absorption. Our results demonstrate the potential of time-resolved operando UV–vis spectroscopy to develop a detailed mechanistic understanding of chemiresistive and gasochromic sensors by discriminating between surface and bulk effects and to combine their use for future gas sensor development. |
| Freie Schlagworte: | Absorption, Atmospheric chemistry, Electrical conductivity, Ethanol, Sensors |
| Fachbereich(e)/-gebiet(e): | 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Physikalische Chemie |
| Hinterlegungsdatum: | 14 Nov 2023 06:35 |
| Letzte Änderung: | 09 Dez 2024 12:47 |
| PPN: | 513165258 |
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| Suche nach Titel in: | TUfind oder in Google |
Verfügbare Versionen dieses Eintrags
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Unraveling Mechanistic Differences in Optical and Electrical Sensors: Time-Resolved Operando UV–VIS Spectroscopy of p-Type Perovskite Gas Sensors. (deposited 06 Dez 2024 13:27)
- Unraveling mechanistic differences in optical and electrical sensors: time-resolved operando UV-vis spectroscopy of P-type perovskite gas sensors. (deposited 14 Nov 2023 06:35) [Gegenwärtig angezeigt]
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