Purification of single-wall carbon nanotubes by ultrasonically assisted filtration

  • Shelimov K
  • Esenaliev R
  • Rinzler A
 et al. 
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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.

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  • Konstantin B. Shelimov

  • Rinat O. Esenaliev

  • Andrew G. Rinzler

  • Chad B. Huffman

  • Richard E. Smalley

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