This project seeks to enhance the bacterial killing effect of titanium dioxide by depositing ultrafine silver nanoparticles onto its surface. A novel dry, surfactant free deposition method was applied to the preparation of ultrafine silver deposits on the titanium dioxide surface. Titanium dioxide (Degussa P25) was first exposed to silver nitrate solution and then dried in a 60°C oven. The silver deposits were formed by illuminating the TiO2 particles under an 18 W blacklight or conventional fluorescent lamp. X-ray Photoelectron Spectroscopy showed that the surface silver species exist as Ag0 and Ag+. The amount of silver doped is 0.323 and 1.605 atom% respectively. The presence of Ag0 was further confirmed by a plasmon peak at 490-530 nm in UV-Visible Reflectance Spectroscopy measurement. Transmission Electron Microscopy shows well-dispersed, uniform silver particles of approximately 5 nm in diameter. The silver doped TiO2 showed enhanced photocatalytic activity and bacteria killing properties due to the ability of silver to trap electrons and to disrupt cell functions. The activity of the nanoparticles was highly dependent upon the aging, drying and illumination conditions.