Abstract

• Gas sensing materials of Cobalt doped Nickel ferrites, Ni1-xCoxFe2O4 (x = 0.0, 0.1, 0.2 and 0.3) were prepared by self-combustion method. A quick combustion was taken as the calcination of metal hydroxides and the reaction between metal oxides. The obtained powders were pressed into disk shapes and subjected to thermal treatment at 1000C for 30 min. The X-ray diffraction (XRD) analysis was carried out to investigate the crystalline phase formation. Microstructural properties of the samples were investigated by Scanning Electron Microscopy (SEM). The grain size of the samples was found to be varied with the dopant concentration of Co. It was investigated the sensitivities of the samples from the gas-sensitive electrical resistance measurements in acetone, ethanol, octane and liquid petroleum gas (LPG) atmospheres. It was observed that the gas sensitivity depends on the concentration of Co dopant and the test gases to be detected.