Applications of Nanotechnology presents the subject with the aim of providing clear and sufficient description on applications of nanotechnology in photovoltaics batteries fuel cells energy transmission water purification defense green building automobile aerospace electronics computer engineering and photonics. This book is primarily intended to be a textbook for Bachelor Degree students of Science Engineering and Technology. This book has a special role to play in the curriculum of all branches of Science Engineering and Technology and will hopefully present valuable guidelines to young graduates. Efforts has been made to cover the applications of nanoscience and nanotechnology.