A simple method for fabricating TiO 2 ‐based sensors of CO( g ) is demonstrated: the oxidation of Ti‐bearing foils. Metallic foils (35 μm thick) were converted into free‐standing, porous rutile foils (60 μm thick) by exposure to O 2 ( g ) at 800°—965°C. The oxidized foils contained thin (0.5—1 μm thick), regularly spaced oxide layers oriented parallel to the external surface. The exposure of such porous foils to increasing concentrations of CO( g ) resulted in a monotonic increase in the steady‐state electrical resistance. Rutile foils sensitive to 50 ppm changes in CO( g ) content with response times of a few minutes were produced. The effects of oxidation conditions and copper doping on sensing performance are discussed.
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Gouma et al. (2000) studied this question.
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