Nano materials are widely seen as having huge potential to bring benefits to many areas of research and applications. ZnS is a direct-transition semiconductor with the widest energy band gap among the groups II-VI compound semiconductor materials, and it is an important material with an extensive range of applications.This book provides the basics of nanotechnology, basic ideas of milling parameters, applications of semiconductor nanoparticles, detailed description of characterization and synthesis techniques. This book covers the Structural,Thermal, and Optical properties of ZnS nanoparticles.