Preparation and characterization of monodisperse metallodielectric composite particles

Nowadays, metallodielectric composite particles (especially spheres) have been the highlight to scientists due to their potential optical applications. In this paper, with wet chemistry method, we revised the Controlled-Double-Jet-Precipitation (CDJP) method and injected the silver salt and reducing agent into the silica-dispersed solution through two syringes. By changing the injected volume and rate, we obtain silica/silver core/shell particles. TEM images show that the silica surface was coated uniformly with silver nanoparticles and the samples were also uniform and low in polydispersity. Also XRD, EDX, DSC, UV-vis analyses were conducted to characterize thus-prepared samples.