In this paper, research on a CO catalytic gas sensor based on nano-crystalline perovskite oxide NdFeO 3 designed for exhaust gas measurement is presented. Nano-crystalline oxide NdFeO 3 was synthesized by a sol–gel citrate technique. The gas sensing characteristics of this sensor were investigated in the concentration range of CO between 0 and 5 vol.% in air. The influences of C 3 H 8 , C 4 H 16 gases, relative humidity and air-flow rate on the cross-sensitivity of the CO sensor were also studied.
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Ho et al. (2011) studied this question.
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