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A Diameter-Selective Attack of Metallic Carbon Nanotubes by Nitronium Ions

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

J Am Chem Soc. 2005 Apr 13;127(14):5196-203.

PMID: 15810855

Abstract:

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP13826863	Nitronium tetrafluoroborate solution		13826-86-3	Price
AP17856927	Nitronium hexafluoroantimonate		17856-92-7	Price

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