Zn_1-xCo_xO (x=0.0, 0.01, 0.03, 0.05) nanoparticles were synthesized using co-precipitation method. Shift in peaks of XRD patterns for 2theta values has been observed. The changes in 2theta value for different peaks for different samples are studied systematically. Dislocation densities (delta) for the samples are calculated and correlated with observed shift in 2theta values for all the samples. UV-Vis study has been performed to understand the effect of cobalt doping on optical band gap. The band gap shows a cubic variation with dopant concentration (x). The nature of band gap variation has been explained and supported by effective mass model. Samples are also characterized by SEM and EDX to understand the surface morphology and elemental composition. Keywords: ZnO, band gap, effective mass model, nanoparticle, dislocation density, co-precipitation.

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