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ABSTRACT: Z. An efficient method for purification of single-wall carbon nanotubes SWNT synthesized by the laser-vaporization process has been developed. Amorphous and crystalline carbon impurities and metal particles are removed from SWNT samples by ultrasonically-assisted microfiltration. Sample sonication during the filtration prevents filter contamination and provides for a fine nanotube--nanoparticle suspension throughout the purification process. The process generates SWNT material with purity of more than 90% and yields of 30--70%, depending on the quality of the starting material. Nanotubes in purified samples are shorter than in pristine samples due to some sonication-induced nanotube cutting. Nanotube bundles in purified samples are also substantially thicker due to spontaneous nanotube alignment. q 1998 Elsevier Science B.V. 1. Introduction Z. Single-wall carbon nanotubes SWNT were first synthesized in an arc discharge in a presence of a wx transition metal catalyst 1,2 . Since then ...