 This study compared the structural and optical properties of two types of titanium dioxide nanoparticles, one with silver doping and their antibacterial 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, indicating greater light absorption. Additionally, the silver-doped titanium dioxide nanoparticles exhibited higher antibacterial activity against pseudomonas aeroginosa than the undoped titanium dioxide nanoparticles. This article was authored by Kiran Gupta, R. P. Singh, Ashutosh Pandey, and others.