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Journal of Electroceramics

, Volume 13, Issue 1–3, pp 707–713 | Cite as

Selective Gas Detection of SnO2-TiO2 Gas Sensors

  • Won Jae Moon
  • Ji Haeng Yu
  • Gyeong Man Choi
Article

Abstract

The composite, consisting of two materials with different sensing temperatures, may show the selectivity for a particular gas. In this study, the microstructural and compositional effects on the electrical conductivity and the CO and the H2 gas sensing properties of SnO2-TiO2 composites were examined. SnO2-TiO2 composites in entire (0–100 mol%) composition range were fabricated in the form of porous pellet by sintering at 800C for 3 h. The effects of CuO-coating (or doping) on the electrical conductivity and the sensing properties to 200 ppm CO and H2 gases were examined.

With CuO-coating, SnO2-TiO2 composites showed the increased sensitivity to CO gas and a large difference in the sensing temperatures between CO and H2 gases. As a result, CuO-coated SnO2-TiO2 composites showed the selectivity for CO gas between 100C and 190C and the selectivity for H2 gas between 280C and 380C.

Keywords

SnO2 TiO2 CuO composite sensitivity selectivity 

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Won Jae Moon
    • 1
  • Ji Haeng Yu
    • 1
  • Gyeong Man Choi
    • 1
  1. 1.Department of Materials Science and EngineeringPohang University of Science and TechnologyHyoja-dongSouth Korea

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