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

被引:134
作者
An, KH
Park, JS
Yang, CM
Jeong, SY
Lim, SC
Kang, C
Son, JH
Jeong, MS
Lee, YH [1 ]
机构
[1] Sungkyunkwan Univ, Ctr Nanotubes & Nanostruct Composites, Inst Basic Sci, BK21 Phys Div, Suwon 440746, South Korea
[2] Seoul Natl Univ, Dept Phys, Seoul 130743, South Korea
[3] Gwangju Inst Sci & Technol, Adv Photon Res Inst, Kwangju 500712, South Korea
关键词
D O I
10.1021/ja0428199
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:5196 / 5203
页数:8
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