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CO Sensing with Tin Dioxide Sensors; Effect of Fabrication Technologyand Operation Conditions as Revealed by Diffuse Reflectance Infrared Fourier Transformed Spectroscopyand Conductance Measurements

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In this article a parameter determining the sensitivity and the reaction path of tin dioxide based sensors to CO are thoroughly reviewed. This includes operating temperature range (200–400 °C), interfering gases (water, oxygen), Pd surface doping and its technology (impregnation, colloidal adsorption) and annealing temperature (500 and 700 °C). It can be concluded that commonly observed surface species (alternatively or together) are monodentate carbonates and carboxylates. They are formed in direct reaction with ionosorbed oxygen. Therefore in order to increase the sensitivity to CO (and decrease cross sensitivity towards water) one has to deliver more reactive oxygen species by a proper approach to sensor preparation procedure.
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Document Type: Research Article

Publication date: December 1, 2008

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