The present work reports the synthesis and characterization of cobalt oxide nanoparticles. Microwave oven method was used for synthesizing cobalt oxide nanoparticles. The synthesized nanoparticles were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), UV-Vis spectroscopy, photoluminescence (PL) and scanning electron microscope (SEM). The prepared samples show poor crystalline nature so that the samples were calcined at 300 °C for 1 hr. The calcined samples were characterized for further changes in its morphology. XRD identifies the sample is in Co3O4 phase with face-centered cubic structure. Debye-Scherer formula was used to calculate the average crystallite size of the annealed sample and it was found to be 7 to 28 nm. In addition to crystallite size, specific surface area, dislocation density and microstrain are calculated using XRD. Williamson-Hall plot was used to calculate the size and strain. FT-IR spectrum shows two stretching bands at 660 and 550 cm−1 which confirm the functional group present in the cobalt oxide nanoparticles. In optical absorption studies, a blue shift in the energy band gap reveals the quantum confinement effect. Photoluminescence spectra shows emission peak in the visible region.
In this work we report the characterization of Cobalt doped ZnO (x=0.06) nanocrystals with different pH values by using microwave irradiation technique. The average crystallite sizes were calculated by using Debye-Scherrer formula and it is concluded that the crystals are in nanometer size. The Fourier Transform Infrared spectroscopy analysis shows the formation of metal oxide bond around 450 cm -1 . The microraman analysis confirmed the existence of Co-O phase at 690 cm -1 in the as prepared samples, but there is no secondary phase was found in the different pH samples. The samples synthesized in different pH values shows the room temperature ferromagnetic behavior.
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