LAUSR

Spherical nanoparticles of zinc oxide (ZnO NPs) have been successfully synthesized through domestic microwave oven-supported solvothermal method by using Allium cepa (Onion) and Raphanus sativus (White Radish) extracts as reducing and capping agent. X-ray powder diffraction confirms the formation of single-nanocrystalline wurtzite-type structure. SEM observations reveal spherical-shaped particles at the nanoscale, while the purity and chemical composition have been confirmed by EDAX analysis. The dielectric study confirms that the dielectric constant and dielectric loss of ZnO nanoparticles decrease with the increase in frequency while increase with the rise in temperature, signifying that the space charge contribution plays a key role in the charge transport process and polarizability. Interestingly, magnetic measurements indicate that the diamagnetic bulk ZnO undergoes magnetic transition into paramagnetic with the presence of a weak ferromagnetic component associated with oxygen vacancies.