Synergistic Effect of Pt-Loading and Mesoporous SnO_2 Layer-Coating on the Gas Sensing Properties of SnO_2 Thick Film Sensors
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Simultaneous surface modifications of SnO<sub>2</sub> powder with Pt-loading and mesoporous SnO<sub>2</sub> (m-SnO<sub>2</sub>) layer-coating have been conducted. The sensors fabricated with the powders prepared with the Pt-loading and subsequent modification with the m-SnO<sub>2</sub> layer showed higher H<sub>2</sub> response than the sensors fabricated with the reverse procedure sequence. Similar synergistic effects in sensing properties to CH<sub>4</sub> and C<sub>2</sub>H<sub>5</sub>OH were also observed at higher operating temperatures. However, such a synergistic effect was not observed when CO was employed as a sample gas. Thus, strict control of mesoporous structure and loading state of Pt microparticles on the surface of SnO<sub>2</sub> powder was found to be effective technique, which improves the gas-response properties of SnO<sub>2</sub>-based sensors.
- The Journal of the Institute of Electrical Engineers of Japan
The Journal of the Institute of Electrical Engineers of Japan 126(8), 492-493, 2006-08-01
The Institute of Electrical Engineers of Japan