Preparation of colloidal Ag nanoparticles

Nanostructures are significant materials because of their size and shape dependent properties. Among these, metal nanostructures have received a lot of attention in recent years because to their ability to tailor digital, optical, optoelectronic and catalytic capabilities by modifying their size, shape, composition, and crystallinity. Silver (Ag) have recently attracted a lot of research attention because to their critical roles in catalysis, organic labelling, optics, and data storage. Herein, we report the preparation of colloidal Ag nanoparticles by chemical precipitation method using chitosan molecules. The optical and structural measurements were studied for as prepared colloidal Ag nanoparticles, are stable, such as optical absorption, photoluminescence (PL), X-Ray diffraction (XRD), and scanning electron microscopy (SEM) indicates that as prepared colloidal Ag nanoparticles are spherical in shape, fluorescent, highly stable. The estimated particle size is 17 nm, the observed phase of the Ag nanoparticles is fcc. The present method of synthesis of colloidal Ag nanoparticles is simple and cost effective.