Abstract
Nanoparticle processing is noticed as one of the key technology which supports the progress of the nanotechnology in recent years. In this paper, outline of "Reactive plasma-liquid phase" reaction method which is nanoparticle preparation method using DC arc plasma, examples of various nanoparticles prepared by this method, and characteristics of theire nanoparticles were described. Especially in these nanoparticles, the composite nanoparticle of metal-non oxide system in which multiple materials combined in the nano region, showed a unique characteristic that the nanoparticles of single composition never show.