Gurlo, Alexander (2006)
Interplay between O2 and SnO2: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen.
In: ChemPhysChem, 7 (10)
doi: 10.1002/cphc.200600292
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Tin dioxide is the most commonly used material in commercial gas sensors based on semiconducting metal oxides. Despite intensive efforts, the mechanism responsible for gas-sensing effects on SnO2 is not fully understood. The key step is the understanding of the electronic response of SnO2 in the presence of background oxygen. For a long time, oxygen interaction with SnO2 has been treated within the framework of the “ionosorption theory”. The adsorbed oxygen species have been regarded as free oxygen ions electrostatically stabilized on the surface (with no local chemical bond formation). A contradiction, however, arises when connecting this scenario to spectroscopic findings. Despite trying for a long time, there has not been any convincing spectroscopic evidence for “ionosorbed” oxygen species. Neither superoxide ions O2−, nor charged atomic oxygen O,− nor peroxide ions O22− have been observed on SnO2 under the real working conditions of sensors. Moreover, several findings show that the superoxide ion does not undergo transformations into charged atomic oxygen at the surface, and represents a dead-end form of low-temperature oxygen adsorption on reduced metal oxide.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2006 |
| Autor(en): | Gurlo, Alexander |
| Art des Eintrags: | Bibliographie |
| Titel: | Interplay between O2 and SnO2: Oxygen Ionosorption and Spectroscopic Evidence for Adsorbed Oxygen |
| Sprache: | Englisch |
| Publikationsjahr: | 13 Oktober 2006 |
| Verlag: | Wiley |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | ChemPhysChem |
| Jahrgang/Volume einer Zeitschrift: | 7 |
| (Heft-)Nummer: | 10 |
| DOI: | 10.1002/cphc.200600292 |
| Kurzbeschreibung (Abstract): | Tin dioxide is the most commonly used material in commercial gas sensors based on semiconducting metal oxides. Despite intensive efforts, the mechanism responsible for gas-sensing effects on SnO2 is not fully understood. The key step is the understanding of the electronic response of SnO2 in the presence of background oxygen. For a long time, oxygen interaction with SnO2 has been treated within the framework of the “ionosorption theory”. The adsorbed oxygen species have been regarded as free oxygen ions electrostatically stabilized on the surface (with no local chemical bond formation). A contradiction, however, arises when connecting this scenario to spectroscopic findings. Despite trying for a long time, there has not been any convincing spectroscopic evidence for “ionosorbed” oxygen species. Neither superoxide ions O2−, nor charged atomic oxygen O,− nor peroxide ions O22− have been observed on SnO2 under the real working conditions of sensors. Moreover, several findings show that the superoxide ion does not undergo transformations into charged atomic oxygen at the surface, and represents a dead-end form of low-temperature oxygen adsorption on reduced metal oxide. |
| Freie Schlagworte: | charge transfer, oxygen, semiconductors, sensors, surface chemistry |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 20 Apr 2012 08:27 |
| Letzte Änderung: | 05 Mär 2013 10:00 |
| PPN: | |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum