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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