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Combustion method has been used as a fast and facile method to prepare nanocrystalline Co3O4 spinel employing sucrose as a
combustion fuel.The productswere characterized by thermal analyses (TGAandDTA), X-ray diffraction technique (XRD), Fourier
transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM)
techniques. Experimental results revealed that the molar ratio of fuel/oxidizer (F/O) plays an important role in controlling the
crystallite size of Co3O4 nanoparticles. Transmission electron microscopy indicated that the crystallite size of Co3O4 nanocrystals
was in the range of 13–32 nm. X-ray diffraction confirmed the formation of CoO phase with spinel Co3O4.The effect of calcination
temperature on crystallite size and morphology has been, also, discussed.