C60 encapsulation inside single-walled carbon nanotubes using alkali-fullerene plasma method

Goo Hwan Jeong, Takamichi Hirata, Rikizo Hatakeyama, Kazuyuki Tohji, Kenichi Motomiya

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

It is reported that alkali-fullerene plasmas consisting of positive alkali-metal ions, negative fullerene ions, and residual electrons are effective in encapsulating fullerenes inside single-walled carbon nanotubes (SWNTs). When positive or negative bias-voltages are applied to SWNTs in plasmas, accelerated negative fullerene or positive alkali-metal ions are irradiated to the SWNTs through the plasma sheath, respectively. Field emission gun transmission electron microscopy (FEG-TEM) clearly shows that drastic structural modifications such as severe bending of SWNT bundles, tube dislocation, and tube tip termination take place after the ion irradiation. Energy dispersive X-ray spectrometry (EDS) confirms the existence of the alkali-metal elements in the sample after the alkali-metal irradiation. In addition to this, the SWNTs encapsulating fullerene molecules are directly observed after only 1 h fullerene-ion irradiation. These results suggest that our experimental system could permit us to intercalate not only fullerenes but also other elements inside the SWNTs by the applied-bias control. Raman scattering spectroscopy is also adopted for the purpose of evaluating pure SWNTs and fullerene encapsulated SWNTs.

Original languageEnglish
Pages (from-to)2247-2253
Number of pages7
JournalCarbon
Volume40
Issue number12
DOIs
Publication statusPublished - 2002 Sep 24

Keywords

  • A. Carbon nanotubes
  • B. Intercalation
  • C. Transmission electron microscopy
  • Fullerene

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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