P1.0.9 Spectroscopic and electrical evidence of transition to nanostructured behaviour in SnO2
- Event
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany - Chapter
- P1.0 Metal Oxide-based Sensors
- Author(s)
- A. Giberti, V. Guidi, C. Malagù - Department of Physics, University of Ferrara (Italy)
- Pages
- 774 - 776
- DOI
- 10.5162/IMCS2012/P1.0.9
- ISBN
- 978-3-9813484-2-2
- Price
- free
Abstract
SnO2 sensors with two different average grain size showed diverse behaviors through electrical and spectroscopic characterizations. In the case of direct current electrical responses, the increase in conductance for the same temperature rise was, on average, about three times larger for larger grained samples. Impedance spectroscopic plots were obtained in dry air and were fitted with the same equivalent circuit for the two granulometries, showing important differences in the fitting parameters. The two techniques present interesting analogies for the same temperature variations. We interpreted this behaviour in terms of barrier modulation through gas chemisorption and oxygen indiffusion, also taking into account of tunneling contribution to conductivity.