To develop a new type of semiconductor gas sensors capable of testing freshness of fish, attempts were made enhance the sensitivity to trimethylamine(TMA) by modifying the carrier concentration of metal oxides by means of the valency control method. T...
To develop a new type of semiconductor gas sensors capable of testing freshness of fish, attempts were made enhance the sensitivity to trimethylamine(TMA) by modifying the carrier concentration of metal oxides by means of the valency control method. The TMA sensitivity of Cr_2O_3 was markedly improved by partial substitution with 5mol% Ti^4+ ions for the Cr^3+ sites. These facts suggest that the sensitivity can be enhanced by reducing the carrier concentration of the oxides.