Pfeiffer, Maximilian Alexander ; Hess, Christian (2022)
Application of Transient Infrared Spectroscopy To Investigate the Role of Gold in Ethanol Gas Sensing over Au/SnO2.
In: The Journal of Physical Chemistry C, 126 (8)
doi: 10.1021/acs.jpcc.1c10384
Artikel, Bibliographie
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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: | 2022 |
| Autor(en): | Pfeiffer, Maximilian Alexander ; Hess, Christian |
| Art des Eintrags: | Bibliographie |
| Titel: | Application of Transient Infrared Spectroscopy To Investigate the Role of Gold in Ethanol Gas Sensing over Au/SnO2 |
| Sprache: | Englisch |
| Publikationsjahr: | 21 Februar 2022 |
| Ort: | Washington, DC |
| Verlag: | ACS Publications |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | The Journal of Physical Chemistry C |
| Jahrgang/Volume einer Zeitschrift: | 126 |
| (Heft-)Nummer: | 8 |
| DOI: | 10.1021/acs.jpcc.1c10384 |
| Zugehörige Links: | |
| 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 |
| Fachbereich(e)/-gebiet(e): | 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Physikalische Chemie |
| Hinterlegungsdatum: | 23 Feb 2022 07:07 |
| Letzte Änderung: | 12 Dez 2024 11:47 |
| PPN: | 52455403X |
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| Suche nach Titel in: | TUfind oder in Google |
Verfügbare Versionen dieses Eintrags
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Application of Transient IR Spectroscopy to Investigate the Role of Gold in Ethanol Gas Sensing over Au/SnO₂. (deposited 06 Dez 2024 13:23)
- Application of Transient Infrared Spectroscopy To Investigate the Role of Gold in Ethanol Gas Sensing over Au/SnO2. (deposited 23 Feb 2022 07:07) [Gegenwärtig angezeigt]
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