Green Nanotechnology discusses the fundamental field of green nanotechnology and the major challenges associated with it. It also includes green synthesis, characterization and catalytic activity of natural bentonite-supported copper nanoparticles and stem cell tracking by using iron oxide nanoparticles. This book also discusses about honey mediated green synthesis of nanoparticles as new era of safe nanotechnology, green preparation and spectroscopic characterization of plasmonic silver nanoparticles using fruits as reducing agents, epigallocatechin gallate nano-delivery systems for cancer therapy, the current trends in the green syntheses of titanium oxide nanoparticles and their applications, cofe2o4/carbon nanotube aerogels as high performance anodes for lithium ion batteries and medical applications of nanoparticles biosynthesized by fungi and yeast.