Pfeiffer, Maximilian ; Hess, Christian (2024)
Application of Transient IR Spectroscopy to Investigate the Role of Gold in Ethanol Gas Sensing over Au/SnO₂.
In: The Journal of Physical Chemistry C, 2022, 126 (8)
doi: 10.26083/tuprints-00028243
Artikel, Zweitveröffentlichung, Postprint
 | Es ist eine neuere Version dieses Eintrags verfügbar. |
Kurzbeschreibung (Abstract)
Diffuse reflectance infrared Fourier transform (FT-IR) spectroscopy (DRIFTS) was used in combination with resistance measurements to study the mechanism of Au/SnO₂ during ethanol gas sensing and to elucidate the influence of gold on the sensor response. Time-resolved DRIFT spectra during ethanol gas sensing reveal significant differences between Au/SnO₂ and bare SnO₂ regarding the amount of C–H-containing adsorbates, which are less abundant on Au/SnO₂ because of their consumption by the adsorbed oxygen species. Modulation excitation DRIFT spectroscopy (ME-DRIFTS) was applied to Au/SnO₂ in comparison to bare SnO₂, enabling a distinction of the temporal behavior of different C–H-containing surface adsorbates such as acetate and formate. ME-DRIFTS reveals the presence of a new surface species at 2030–2060 cm⁻¹, not detected for unloaded SnO₂ and associated with CO adsorbed on negatively charged gold particles. X-ray photoelectron spectroscopy (XPS) and ultraviolet/visible (UV/vis) spectra confirm the presence of metallic gold, which makes an influence on the electronic properties of the SnO₂ sensor material unlikely. Based on our spectroscopic findings, we postulate a detailed ethanol gas-sensing mechanism and attribute the increase in the sensor response to an oxygen spillover from gold to the surface of tin oxide.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Pfeiffer, Maximilian ; Hess, Christian |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Application of Transient IR Spectroscopy to Investigate the Role of Gold in Ethanol Gas Sensing over Au/SnO₂ |
| Sprache: | Englisch |
| Publikationsjahr: | 6 Dezember 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 21 Februar 2022 |
| Ort der Erstveröffentlichung: | Washington, DC |
| Verlag: | American Chemical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | The Journal of Physical Chemistry C |
| Jahrgang/Volume einer Zeitschrift: | 126 |
| (Heft-)Nummer: | 8 |
| Kollation: | 31 Seiten |
| DOI: | 10.26083/tuprints-00028243 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/28243 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichungsservice |
| Kurzbeschreibung (Abstract): | Diffuse reflectance infrared Fourier transform (FT-IR) spectroscopy (DRIFTS) was used in combination with resistance measurements to study the mechanism of Au/SnO₂ during ethanol gas sensing and to elucidate the influence of gold on the sensor response. Time-resolved DRIFT spectra during ethanol gas sensing reveal significant differences between Au/SnO₂ and bare SnO₂ regarding the amount of C–H-containing adsorbates, which are less abundant on Au/SnO₂ because of their consumption by the adsorbed oxygen species. Modulation excitation DRIFT spectroscopy (ME-DRIFTS) was applied to Au/SnO₂ in comparison to bare SnO₂, enabling a distinction of the temporal behavior of different C–H-containing surface adsorbates such as acetate and formate. ME-DRIFTS reveals the presence of a new surface species at 2030–2060 cm⁻¹, not detected for unloaded SnO₂ and associated with CO adsorbed on negatively charged gold particles. X-ray photoelectron spectroscopy (XPS) and ultraviolet/visible (UV/vis) spectra confirm the presence of metallic gold, which makes an influence on the electronic properties of the SnO₂ sensor material unlikely. Based on our spectroscopic findings, we postulate a detailed ethanol gas-sensing mechanism and attribute the increase in the sensor response to an oxygen spillover from gold to the surface of tin oxide. |
| Freie Schlagworte: | Ethanol, Gold, Oxides, Oxygen, Sensors |
| Status: | Postprint |
| URN: | urn:nbn:de:tuda-tuprints-282434 |
| 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: | 06 Dez 2024 13:23 |
| Letzte Änderung: | 09 Dez 2024 12:49 |
| PPN: | |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
Verfügbare Versionen dieses Eintrags
- Application of Transient IR Spectroscopy to Investigate the Role of Gold in Ethanol Gas Sensing over Au/SnO₂. (deposited 06 Dez 2024 13:23) [Gegenwärtig angezeigt]
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum