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.
CITATION STYLE
Shelimov, K. B., Esenaliev, R. O., Rinzler, A. G., Huffman, C. B., & Smalley, R. E. (1998). Purification of single-wall carbon nanotubes by ultrasonically assisted filtration. Chemical Physics Letters, 282(5–6), 429–434. https://doi.org/10.1016/S0009-2614(97)01265-7
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