Cobalt doped Bismuth Ferrite Nanoparticles [BiFe1-xCoxO3 ], where x = 0.00, 0.01, 0.03, 0.05 and 0.07 were synthesized by ethylene glycol-based sol-gel technique and annealed at relatively low temperature of 5500C.XRD confirmed the phase pure formation of pristine BiFeO3, and cobalt doped BiFeO3samples. The crystallite sizes as determined by Scherrer equation were found to be 46 nm,, 50 nm, 48 nm, 45 nm and 43 nm for 0%, 1%, 3%, 5% and 7% cobalt doped Bismuth ferrite nanoparticles respectively.The Absorption spectra was performed by Uv Visible Spectroscopy.Band gap energy was calculated by Tauc Equation.With the increase in doping level 0%,1%,3%,5% and7%, of Cobalt dopant, a gradual blue shift in the absorption peak has been observed in the manner, 592,565,555,528 and510 nm. Pristine Bismuth Ferrite exhibits the absorption peak at 592 nm and a maximum blue shift of 82 nm is observed for 7% Cobalt doped Bismuth Ferrite Nanoparticless. The band gap energy of pristine Bismuth Ferrite Nanoparticles was found to be 2.07 eV, 2.13 eV, 2.26 ev, 2.33 eV and 2.42 eV for 1%, 3%, 5% and 7% Cobalt doped Bismuth Ferrite Nanoparticles. Band gap energy is tuned by increasing doping concentration of cobalt. Cobalt doped Bismuth ferrite nanoparticle is quite suitable for photocatalysis and optoelectronic device application.
