抄録
Simultaneous surface modifications of SnO2 powder with Pt-loading and mesoporous SnO2 (m-SnO2) layer-coating have been conducted. The sensors fabricated with the powders prepared with the Pt-loading and subsequent modification with the m-SnO2 layer showed higher H2 response than the sensors fabricated with the reverse procedure sequence. Similar synergistic effects in sensing properties to CH4 and C2H5OH 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 SnO2 powder was found to be effective technique, which improves the gas-response properties of SnO2-based sensors.
