Abstract
Highly functional nano metal powders such as Ag, Au, Cu, CuNi and CuAg were developed using a specially designed RF plasma synthesis equipments operating at 20kW and 13.56MHz and their material properties were characterized. In the examination of their morphology by TEM and SEM, the nano metal powders had a perfect round shape with either ball type or hollow type, depending upon their cooling rates. In order to ascertain whether a single nano powder is ball type or hollow sphere, it was drilled out by fs-laser. Very large size hollow spheres were found. They showed the strongly affirmative behaviors to human body by the subsequent evaluation experiments. It was found that the nano metals were not oxidized under the atmospheric environment. These kinds of property changes were directly confirmed by their magnetic properties.