This research work presented the preparation of pure–undoped TiO2 and 0.5 wt.% Ni-doped nanoparticles through Sol-gel method using titanium tetra isopropoxide as titanium source and nickel nitrate hexahydrate as nickel source. The prepared samples were calcined at 450, 500, 550, 600, 700 and 800oC and analyzed for energy band gap, surface area, particle size morphology and purity using UV-Vis DRS, BET, SEM and EDX respectively. The UV-Vis DRS analysis revealed increase in energy band gap of the samples from 2.2 to 2.88eV as calcinations temperature increases from 450 to 800oC. Increasing the calcinations temperature increases the particles size from 66nm to 27272 nm with reduction in BET surface area from 90.48 to 0.22 m2/g. The pure TiO2 produced at 450oC has surface area of 108.99m2/g, bandgap energy of 3.013eVand particle size of 55.1nm.SEM analysis revealed the formation of relatively spherical-shape agglomerated nanoparticles, but the EDX spectroscopic analysis maintained that the TiO2 samples produced in this work has the percentage purity of 55.9% and 46.2% when doped with 0.5 %Ni nanoparticle..

Keywords: Ni-dopedTiO2 nano particle, Pure-TiO2, Calcination Temperature, Optical Properties.