Abstract
With Y–Ni alloy and CaC 2–Ni as catalyst, large-scale single-wall carbon nanotubes (SWCNTs) were produced by d.c. arc-discharge method. The yield of SWCNTs and the composition of the raw-soot was quantified with thermogravimetric analysis (TGA). The burning temperature of SWCNTs in air was also determined. On these bases, 350°C was chosen for the first step purification of SWCNTs. Combining with the micro-filtration method, larger than 90% purity of SWCNTs and high purity of carbon nanoparticles were obtained.
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