Colloidal Synthesis of Silver Nano Particles

Abstract

Silver nanoparticles exhibit new optical properties, which are observed neither in molecules nor in bulk metals. One example is presence of absorption band in visible light region. A class of materials in which two or more phases (solid, liquid or gas) of same or different materials co exists with at least one dimension less than a micrometer is known as colloids.  Nanomaterials are a subclass of colloids, in which one of the dimensions of colloids is about 1 to 100 nanometer range. In the present work, Ag nanoparticles were synthesized by silver salt (AgNO₃) reduction with sodium citrate and then characterized using UV-Visible spectroscopy and SEM. UV-Visible absorption results confirmed formation of silver particles prepared and SEM indicates the size in nanometer (nm) range.