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Rare earth oxides LaFe1-xZnxO3 were synthesized by sol–gel method. The X-ray diffraction patterns (XRD) showed that LaFe1-xZnxO3oxides are single phase with orthorhombic perovskite structure, they all show p-type semiconducting properties. Among nanocrystalline LaFe1-xZnxO3 oxides, LaFe0.77Zn0.23O3 exhibits the highest sensitivity of 44.5 to 100 ppm formaldehyde. The optimal working temperature was...
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