Abstract
The effect of Au sputtered at the interface between the SnO2-disk sensing-electrode (SE) and a porous yttria-stabilized zirconia (YSZ) layer on the sensing characteristics of the mixed-potential type gas sensor was examined. The existence of Au at the SE/YSZ interface gave a significant increase in NH3 sensitivity, while the sensitivities to the other gases examined were largely decreased. This brought about an excellent NH3 selectivity. By evaluating polarization curves, the Au sputtering was confirmed to improve the cataltic activity to the anodic reaction of NH3, while drastically decreased that of C3H6.
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