Super-robust, lightweight, conducting carbon nanotube blocks cross-linked by de-fluorination

Yoshinori Sato, Makoto Ootsubo, Go Yamamoto, Gregory Van Lier, Mauricio Terrones, Shinji Hashiguchi, Hisamichi Kimura, Akira Okubo, Kenichi Motomiya, Balachandran Jeyadevan, Toshiyuki Hashida, Kazuyuki Tohji

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


We produced large binder-free multi-walled carbon nanotube (MWNT) blocks from fluorinated MWNTs using thermal heating and a compressing method in vacuo. This technique resulted in the formation of covalent MWNT networks generated by the introduction of sp3-hybridized carbon atoms that cross-link between nanotubes upon de-fluorination. The resulting carbon nanotube blocks are lighter than graphite, can be machined and polished, and possess average bending strengths of 102.2 MPa, a bending modulus of 15.4 GPa, and an electrical conductivity of 2.1 × 102 S/cm. Although each nanotube exhibits a random structure in these blocks, the mechanical properties are 3 times higher than those obtained for commercial graphite. On the basis of theoretical molecular dynamics simulations, a model is presented for the nanotube interconnecting mechanism upon de-fluorination.

Original languageEnglish
Pages (from-to)348-356
Number of pages9
JournalACS Nano
Issue number2
Publication statusPublished - 2008 Feb 1


  • Binder-free
  • Blocks
  • Carbon nanotubes
  • Fluorine
  • Solidification
  • Strength conducting

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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