Detection mechanism of TiO2-based ceramic H2 sensors
The H2-sensing mechanism of TiO2 thick-films, deposited on Al2O3 substrates by screen-printing, is described. The role of the catalytic activity of the electrode material on the sensor response was tested using Pt and Au electrodes. An impedance analyser (20 Hz-1 MHz) was used to monitor the film im...
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| Veröffentlicht in: | Journal of the European Ceramic Society 1999, Vol.19 (6-7), p.887-891 |
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| container_title | Journal of the European Ceramic Society |
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| creator | MATHER, G. C MARQUES, F. M. B FRADE, J. R |
| description | The H2-sensing mechanism of TiO2 thick-films, deposited on Al2O3 substrates by screen-printing, is described. The role of the catalytic activity of the electrode material on the sensor response was tested using Pt and Au electrodes. An impedance analyser (20 Hz-1 MHz) was used to monitor the film impedance before and after exposure to H2. Continuous monitoring of the film resistance was performed by dc measurements. The film resistance was measured as a function of temperature (500-650 C), time, and gas phase composition (air and 0-10% H2 in a N2-based gas stream). The equilibrium gas phase pO2 (monitored with a ZrO2-based oxygen sensor) was also used to identify the H2 detection mechanism of the films. 8 refs. |
| doi_str_mv | 10.1016/s0955-2219(98)00338-0 |
| format | Article |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | Analytical chemistry Chemistry Exact sciences and technology General equipment and techniques General, instrumentation Instruments, apparatus, components and techniques common to several branches of physics and astronomy Physics Sensors (chemical, optical, electrical, movement, gas, etc.) remote sensing |
| title | Detection mechanism of TiO2-based ceramic H2 sensors |
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