Effect of pH and Particle Size on the Magnetic Behavior of Cobalt Doped ZnO Nanocrystals

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-1in 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.