Synthesis and Characterization of Antibacterial Ag−SiO₂ Nanocomposite

Abstract

In order to increase antibacterial abilities and avoid aggregation of Ag nanoparticles, Ag−SiO 2 nanocomposites were studied to achieve hybrid structure. SiO 2 nanoparticles synthesized by the Stöber method served as seeds for immobilization of Ag. The chemical binding structure and morphology of Ag−SiO 2 nanocomposites and SiO 2 nanoparticles were investigated with X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The antibacterial properties of Ag−SiO 2 nanocomposites were examined with disk diffusion assay and minimum inhibitory concentration (MIC). Results showed that Ag nanoparticles are homogeneously formed on the surface of SiO 2 nanoparticles without aggregation and showed excellent antibacterial abilities.