Abstract
The sensitive composite material was prepared by loading Pt and La 2O 3 into ultrafine In 2O 3 matric material (8 nm) synthesized by microemulsion method. A highly selective ethanol gas sensor was developed based on hot-wire type gas sensor, which was sintered in a bead (0.8 mm in diameter) to cover a platinum wire coil (0.4 mm in diameter). The gas sensor was operated by a bridge electric circuit. The influences of La 2O 3 and Pt additives on C 2H 5OH sensing properties of In 2O 3-based gas sensor were discussed. The addition of La 2O 3 resulted in a prominent selectivity for C 2H 5OH, and the addition of Pt improved the response rate to C 2H 5OH without affecting the sensitivity. The temperature and humidity characteristics of the sensor output were also investigated. The selective sensor had low power consumption, significantly minor humidity and temperature dependence, high selectivity and prominent long-term stability.
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