Structural, Electrical Properties of Nanocrystalline Co Doped- LaxCe1-XO2 for Gas Sensing Applications

Abstract: Nanocrystalline Ce_0.6La_0.4O₂ was synthesized by the sol-gel citrate method. Structural and electrical characteristics were performed. The X-ray diffraction (XRD) of nanocrystalline Ce_0.6La_0.4O₂shows cubic phase of CeO₂ with crystalline size 40 nm. The impedance analysis shows that, at lower frequency range, the conductivity of the 10 wt % Co doped Ce_0.6La_0.4O₂calcinated at 650 ^oC nearly same but with increasing frequency, the conductivity increases with temperature. The gas sensing properties for reducing gases like ammonia (NH₃), liquified petroleum gas (LPG), carbon monoxide (CO) and hydrogen gas (H₂) were studied. The maximum sensitivity and selectivity was obtained for 10 wt % Co doped Ce_0.6La_0.4O₂ at an operating temperature 250 ^oC for NH₃ gas. Pd incorporation over 10 wt% Co doped Ce_0.6La_0.4O₂ improved the sensitivity, response time, and reduced the operating temperature from 250 to 200 ^oC of the sensor for ammonia gas.

Keywords: Ce_0.6La_0.4O₂, Sensitivity, Selectivity, Ammonia gas sensor

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