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Quick precipitation method is simple and efficient to obtain cobalt oxide (Co3O4) nanoparticles. The prepared cobalt oxide was characterized by powder X-ray diffraction pattern confirmed the formation of single phase Co3O4. Scanning electron microscope image indicates the sphere like morphology and its grain size will be in the range of 50–100 nm. UV-DRS optical property of Co3O4 shows a band gap in the energy range of 3.50 eV. A vibrating sample magnetometer for the analysis of Co3O4 sample showed it to behave as a soft ferromagnetic material.
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Agilandeswari et al. (2015) studied this question.
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