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

doi:10.3724/SP.J.1077.2012.11695

Abstract

Abstract: Pt/TiO₂ thick film gas sensors were modified by dipping method in H₂PtCl₆ contained solution. In order to get different Pt/TiO₂surface 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.

Key words: TiO₂, surface state, steady-state resistance, response time

CLC Number:

TQ174

ZHANG Mao-Lin, YUAN Zhan-Heng, SONG Jian-Ping, ZHENG Che. Influence of Surface States on Gas Response Properties of Pt/TiO₂[J]. Journal of Inorganic Materials, 2012, 27(9): 928-932.

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

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