Abstract
Nanocrystalline nickel ferrite (NiFe2O4) was synthesized by sol–gel self-combustion technique. Ball milling at room temperature was carried out to control the particle size. Characterization of synthesized powders was made using X-ray diffraction (XRD) and Transmission electron microscopy (TEM) analysis. Fine powder resulted from milling was used to prepare gas sensing elements in pellet form. The gas-sensing properties were studied in presence of hydrogen and hydrogen sulfide as test gases. The gas-response was found to be strongly influenced by the particle size. Significantly high sensitivity of ~75% was found for ~5.35nm nickel ferrite in presence of 200ppm H2S at an operating temperature of 150°C. Sensitivity was found to increase with temperature before being maximum at a particular operating temperature.
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