Abstract
Mixed potential gadolinia-doped ceria (GDC)-based gas sensors using a double perovskite composite oxide (Sr2NiMoO6) were fabricated to detect ethanol. The influence of the sensing materials sintered at different temperatures on the sensor properties was investigated. The results showed that Sr2NiMoO6 annealed at 1000 °C was the most suitable sensing material for detecting ethanol due to its suitable micromorphology and high electrochemical catalytic activity. The sensor attached with Sr2NiMoO6-1000 °C displayed the highest sensitivity to 1–200 ppm ethanol at 550 °C, the response value ΔV was piecewise linearly with the logarithm of ethanol concentration, and the slopes were −8 and −51.3 mV/decade in the ranges of 1–10 ppm and 10–200 ppm ethanol, respectively. Moreover, the stability and sensing mechanism of the sensor were also investigated.
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