Cap removal and shortening of double-walled and very-thin multi-walled carbon nanotubes under mild oxidative conditions

R. Marega, G. Accorsi, M. Meneghetti, A. Parisini, M. Prato, D. Bonifazi,
Carbon 2009, 47, 675-682
DOI: 10.1016/j.carbon.2008.10.049


Homogeneous carbon-based materials were prepared for endohedral functionalization starting from carbon nanotubes (CNT) samples mainly containing double-walled and very-thin multi-walled CNTs. Comprehensive structural characterization of end-opened and shortened CNTs, which were prepared under mild oxidative conditions using dilute aqueous H2O2 solutions, is reported. 90% of the 400 measured nanotubes were shorter than 1 μm with an average value of about 500 nm. TEM observations have confirmed the shortening and opening of the end caps. TGA analysis and Raman spectroscopy showed a reduced impurity content after the oxidation treatment.

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