Abstract
The trimethylamine sensing characteristics of various semiconductive metal oxides and the sensitivity enhancement by some noble metals have been investigated to develop a new type of fish freshness sensor. Among the oxides studied, TiO 2 exhibits the highest sensitivity, and the most pronounced enhancement is achieved with 0.5 wt.% Ru or 2.0 wt.%. It is found that the 0.5 wt.% Ru/TiO 2 sensor exhibits a large response to the actual gases produced by a Japanese saurel at an early stage of decomposition.
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