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Etude électrique et spectroscopique de l'influence de l'électrode sur les capteurs de gaz à base de SnO2

Abstract : The influence of the electrode nature on the performance of semiconducting metal oxide based gas sensors is recognized and experimentally proven. Here, for the first time we are providing clear spectroscopic evidence (DRIFTS) for the influence of the electrodes nature (Pt and Au) on the surface chemistry associated to CO detection with SnO2 thick film sensors. Our results show that the nature and concentration of the CO reaction intermediates (carbonates and carboxylates) depend on the presence and nature of the electrodes. Moreover, Thermodesorption measurements prove that the influence of the electrodes nature plays a key role on oxygen adsorption at the SnO2 surface. The result will be discussed in order to be useful for basic understanding of gas sensors.
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https://tel.archives-ouvertes.fr/tel-00348866
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Submitted on : Monday, December 22, 2008 - 3:06:54 PM
Last modification on : Friday, October 23, 2020 - 4:52:16 PM
Long-term archiving on: : Tuesday, June 8, 2010 - 6:06:29 PM

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  • HAL Id : tel-00348866, version 1

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Johan Bertrand. Etude électrique et spectroscopique de l'influence de l'électrode sur les capteurs de gaz à base de SnO2. Sciences de l'ingénieur [physics]. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2008. Français. ⟨tel-00348866⟩

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