No abstract

No abstract

No abstract

A simple method for fabricating TiO 2 -based sensors of CO(g) is demonstrated: the oxidation of Ti-bearing foils. Metallic foils (35 m thick) were converted into free-standing, porous rutile foils (60 m thick) by exposure to O 2 (g) at 800°-965°C. The oxidized foils contained thin (0.5-1 m 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.