7.3.1 Operando spectroscopic study of the EtOH gas sensing mechanism of In2O3
- Event
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany - Chapter
- 7.3 Metal Oxide-based Gas Sensors VII
- Author(s)
- S. Sänze, C. Hess - Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt (Germany)
- Pages
- 613 - 615
- DOI
- 10.5162/IMCS2012/7.3.1
- ISBN
- 978-3-9813484-2-2
- Price
- free
Abstract
By using operando Raman spectroscopy, we studied the ethanol gas sensing mechanism of indium oxide. New Raman bands due to adsorbates at 937, 2868, 2939^cm-1 as well as changes of the Raman spectrum of the indium oxide sensor at 407, 3644 and 3658^cm-1 were detected. The adsorbates are identified as acetate and formate species and the changes of the indium oxide bands originate from reduced indium oxide. With FTIR gas-phase spectroscopy, the gas products of the EtOH sensing process were quantified and by measuring simultaneously the sensor resistance, we could correlate the sensing process to the spectroscopic changes.