Preparation and Ethanol Sensing Behavior of Spinel-type Nanosized Mixed Ferrites Containing Zn
نویسنده
چکیده
Nanocrystalline Ni1-xZnxFe2O4 (x = 0, 0.2, 0.3 and 0.4) mixed ferrite with cubic spinel structure was successfully prepared by the citrated sol-gel method followed by calcinations at 600 C. Characterization of the materials was performed by XRD. Indirect-heating sensors using as-prepared powders of mixed ferrite as sensitive materials were fabricated on an alumina tube with Au electrodes and Platinum wires. The gas response of Ni1-xZnxFe2O4 based thick film sensor to C2H5OH, was measured. Ni0.6Zn0.4Fe2O4 based thick film sensor showed better response to ethanol gas at 300 C as compared with other tested reducing gases. The observed gas sensing potential is explained by using the reducer nature of the gaseous species that react on the surface of the heated semi-conducting mixed oxide. The sensor exhibited a fast response and a good recovery.
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