Abstract
In this paper, we report the properties of the nano-crystalline oxides LnFeO 3 ( Ln = La, Nd and Sm) synthesized by sol–gel citrate technique. The crystalline structure of the oxides was analyzed by X-ray diffraction (XRD). The surface morphologies of the LnFeO 3 thick-films on Al 2O 3 substrates were measured by scanning electron microscope (SEM). The gas-sensing characteristics of the oxides LnFeO 3 were investigated in methane (CH 4), propane (C 3H 8) and n-hexane (C 6H 14) gases. All LnFeO 3-based sensors exhibited good HC sensing characteristics. The very high n-hexane sensitivities of NdFeO 3 and SmFeO 3-based sensors were discussed in terms of an important role of rare earth elements.
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