High yield synthesis of single-walled carbon nanotubes by DC arc discharge in 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 in high temperature atmospheric gas of He. With the help of scanning electron microscope and transmission electron microscope, SWNTs were confirmed as the web formed in the evaporation chamber. The micro-Raman studies on the specimen indicated that the SWNTs had four breathing mode frequencies corresponding to 1.25 - 1.49 nm diameter of SWNTs.