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In this work firstly Nickel Ferrite (NiFe₂O₄) nano particles (pure and 10% Cobalt doped-) were synthesized by microwave assisted combustion method. Some disks with radius of 2.5 cm were made by NiFe₂O₄ and Ni_0.9Co_0.1Fe₂O₄ nanoparticles. The prepared disks were annealed at 600 °C, 650 °C and 700 °C for 4 hours. The structural and surface morphology of the samples were studied using X-ray diffraction (XRD) and field emission scanning microscope (FESEM). XRD Spectra indicated the formation of spinel phase. The gas sensing properties of the samples were investigated in presence of 2500ppm acetone gas. The results of this work were shown that as grown samples (pure and doped without annealing) have a higher sensitivity at operating temperature of 250°C. Although, the sensitivity of as grown NiFe₂O₄ was also higher than as grown Ni_0.9Co_0.1Fe₂O₄ sample. Moreover, the sensitivity of the samples was significantly affected by the operating temperature of the gas sensor. Comparison of the results showed that as grown pure Nickel Ferrite is more suitable sample for acetone gas sensing. 

Keywords: Aceton gas sensor, Co doped-Nikel ferrite, Microwave assisted combustion method, Gas sensor.

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