The average crystalline size calculated from full width half maximum of high intense peak is found to
be 10.34 nm for pure ZnO nanoparticles and 23.58 nm for Co doped ZnO Particles and corresponding lattice
strain in the nanoparticles is found to be 0.0221 in the case of undoped ZnO and 0.0071 in the case of doped
ZnO Nanoparticles. From spectrum it was clear that significant increase in the crystalline size is observed by
doping with cobalt. This show snanoparticles possess good crystallinity. The reduction in the lattice strain explains
the grain can grew much easier due to the incorporation of Co dopant