Synthesis of Ag/TiO 2 Core/Shell Nanoparticles with Antibacterial Properties

Monodispersed Ag/ core/shell nanoparticles were synthesized in solution via colloid-seeded deposition process using Ag nanoparticles as colloid seeds and as Ti-source respectively. Silver nitrate was reduced to Ag nanoparticles with in the presence of CTAB as stabilizing agent. The titania sols hydrolyzed by the solution deposited on the surface of Ag nanoparticles to form the Ag/ core/shell nanoparticles. Inductively coupled plasma atomic emission spectrometry (ICP-AES) showed low amount of Ag ion leaching from the Ag/ core/shell nanoparticles. The Ag/ core/shell nanoparticles indicated excellent antibacterial effects against Escherichia coli and maintained long-term antibacterial property.