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Influence of Surface States on Gas Response Properties of Pt/TiO2

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Author(s): ZHANG Mao-Lin, YUAN Zhan-Heng, SONG Jian-Ping, ZHENG Che

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 27;
Issue: 9;
Start page: 928;
Date: 2012;
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Keywords: TiO2; surface state; steady-state resistance; response time

ABSTRACT
Pt/TiO2 thick film gas sensors were modified by dipping method in H2PtCl6 contained solution. In order to get different Pt/TiO2 surface states, the thick films were treated with different process. Microstructural and morphological characteristics were investigated by XRD and SEM. The resistance-oxygen partial pressure relationship was used to calculate activation energy (E) of this film. Steady-state resistance and dynamic response of the sensor exposed to H2/O2 were tested, separately. The results indicated that the steady-state resistance which affected by spill-over effect arose from the Pt distribution states. However, the response time was associated with the activation energy (E). Sensors with lower activation energy exhibited a faster rate of response when the magnitude of response was approximately uniform.

Tango Jona
Tangokurs Rapperswil-Jona

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