A diameter-selective attack of metallic carbon nanotubes by nitronium ions

Kay Hyeok An, Jin Sung Park, Cheol Min Yang, Seung Yol Jeong, Seong Chu Lim, Chul Kang, Joo Hiuk Son, Mun Seok Jeong, Young Hee Lee

Research output: Contribution to journalArticlepeer-review

146 Scopus citations


We have found a method for a diameter-selective removal of metallic single-walled carbon nanotubes (m-SWCNTs) from semiconducting (s-) ones by stirring or sonicating SWCNT powder in tetramethylene sulfone (TMS)/chloroform solution with nitronium hexafluoroantimonate (NO2SbF6: NHFA) and nitronium tetrafluoroborate (NO2BF4: NTFB). Positively charged nitronium ions (NO2+) were intercalated into nanotube bundles, where the intercalation was promoted also by the counterions. Nitronium ions selectively attacked the sidewall of the m-SWCNTs due to the abundant presence of electron density at the Fermi level, thus yielding stronger binding energy as compared to the counterpart s-SWCNTs. The s-SWCNTs were left on the filter after filtration, whereas the m-SWCNTs were disintegrated and drained away as amorphous carbons. The effectiveness of removing m-SWCNTs was confirmed by the resonant Raman spectra and absorption spectra.

Original languageEnglish
Pages (from-to)5196-5203
Number of pages8
JournalJournal of the American Chemical Society
Issue number14
StatePublished - 13 Apr 2005


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