| Abstract
| - Long fibers of high purity single-walled carbon nanotubes (SWNTs) were directly synthesized macroscopicallyby the modified arc discharge method. The purity of SWNT in fibers that can be obtained, as high as 80%(volume), was evaluated by scanning electron microscopy, thermogravimetric analysis, and Ramanspectroscopy. The diameters of the SWNT fibers we obtained vary from 2 to 200 μm with a predominationof 5−20 μm. The lengths can reach as long as 10 centimeters. It is proposed that promoter FeS is a crucialfactor for synthesizing high purity SWNT fibers.
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