Purification of single-wall carbon nanotubes by ultrasonically assisted filtration

Konstantin B. Shelimov, Rinat O. Esenaliev, Andrew G. Rinzler, Chad B. Huffman, Richard E. Smalley

Research output: Contribution to journalArticlepeer-review

319 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)429-434
Number of pages6
JournalChemical Physics Letters
Issue number5-6
StatePublished - Jan 23 1998
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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