Nanowires belong to one dimensional nanostructure and can be defined as, the nanostructures have two confined dimensions in nanometer scale and other one is unconstrained direction for electrical conduction. In nanowires the surface to volume ratio of atoms increased. One dimensional nanowires are attracted towards potential application because these are used as building blocks for complex micro and nano devices. Zinc Oxide nanowires (ZnO NWs) have got an efficacious place in nanoworld due to their tremendous properties and applications. In present work, physical properties of the ZnO NWs have been modified by carbon (C) and phosphorus (P) ion implantation. This book reveals that phosphorous ions implantation in ZnO NWs is a successful approach towards the tailoring of P-type ZnO Nanowires.