 This study compared the structural and optical properties of two types of titanium dioxide nanoparticles, one with silver doping and their photocatalytic activity against various bacterial strains. The results showed that the silver-doped titanium dioxide nanoparticles had a lower band gap than the undoped titanium dioxide nanoparticles, which could explain why they are more efficient at absorbing light. Additionally, the silver-doped titanium dioxide nanoparticles were more effective at killing bacteria than the undoped titanium dioxide nanoparticles. This article was authored by Kiran Gupta, R. P. Singh, Ashutosh Pandey, and others,