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Humidity sensitivity of metal ferrite nanoparticles [MFe 2 O 4 , M (II) ¼ Co, Cu, Mg, Ni and Zn] prepared by solid-state reaction of inorganic precursors was studied. The process was convenient, environmentally-friendly, inexpensive and efficient. The spinel structure of the compounds prepared by this method was confirmed by XRD and FT-IR studies. The surface morphology was observed by scanning electron microscopy, and the surface area was analysed by the nitrogen adsorption/desorption study by the Brunauer-Emmett-Teller (BET) method. All the samples were subjected to dc electrical conductivity studies at room temperature. The resistance measurements as a function of relative humidity in the range of 5-98% and the sensitivity factor (S f ¼ R 5% / R 98% ) were calculated. Among all the metal ferrites, zinc ferrite (ZnFe 2 O 4 ) possessed the highest humidity sensitivity factor of 2895 � 85, whereas the other compounds possessed a very low sensitivity factor. The response and recovery times of ZnFe 2 O 4 were 330 and 80 s.

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