High yield synthesis of single-walled carbon nanotubes by DC arc dischargein high temperature He gas

High yield synthesis of single-walled carbon nanotubes (SWNTs) was realized by DC are discharge evaporation of Ni 4% - Y 1% composite graphite rodes i n high temperature atmospheric gas of He. With the help of scanning electro n microscope and transmission electron microscope, SWNTs were confirmed as the web formed in the evaporation chamber. The micro-Raman studies on the s pecimen indicated that the SWNTs had four breathing mode frequencies corres ponding to 1.25 - 1.49 nm diameter of SWNTs.