Abstract

The pure and different weight % of cobalt doped TiO2 nanoparticles were synthesized by sol-gel method and calcinated at 600°C for 5 h. The synthesized products were characterized by XRD, FESEM, EDXS and UV–Vis. and Photoluminescence study. XRD pattern of pure TiO2, 1 w t%, 3 wt% Co-doped TiO2 nanoparticles confirms the anatase structure. The crystallite size of pure TiO2 is 37 nm and 1 wt %, 3wt % Co-doped TiO2 are 38 and 42 nm. The FESEM Micrograph shows the agglomerated particles of spherical-like morphology. Direct allowed band gap of pure and Co-doped TiO2 nanoparticles studied by UV–Vis spectrometer. The photoluminescence spectra of pure and Co-doped TiO2 shows the recombination of charge carriers is effectively reduced by the doping Cobalt metal. The Kirby Bauer Agar Well Diffusion Assay method was employed to explore antimicrobial activity of nanosized pure and Co-doped TiO2 colloidal suspension against the test microorganism of gram positive bacteria (B. subtilis), gram negative Bacteria (S. aeruginosa) and one fungus (A. niger). The Codoped TiO2 nanoparticles inhibited shows that the multiplication and growth of the above mentioned test bacteria and fungi. Antimicrobial activity was found against all tested microorganisms and confirmed that Co-doped TiO2 nanoparticles possess high antimicrobial activity at a concentration of range of 25, 50, 75 and100 ?g of 1wt%, 3wt% Co-doped TiO2 solutions.