The morphology of the samples was investigated by field emission scanning electron microscope (FESEM) as shown in the figure-3. Undoped ZnO nanoparticles appears like spherical in shape of size ~1 µm and5 mol% of Co doped and 5 mol% of Ag doped ZnO nanoparticles forms cauliflower shape and co-doped (Ag, Co) ZnO nanoparticles also appears like agglomerated cauliflower shape. All these nanoparticles present in the size range of 100- 200 nm
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