Functionalization of primary amine groups to single-walled carbon nanotubes by reacting fluorinated SWCNTs with ammonia gas at a low temperature

Koji Yokoyama, Yoshinori Sato, Masashi Yamamoto, Tetsuo Nishida, Takashi Itoh, Kenichi Motomiya

Research output: Contribution to journalArticlepeer-review

Abstract

We functionalized primary amine groups (NH2-) to single-walled carbon nanotubes (SWCNTs) by reacting fluorinated SWCNTs with ammonia gas at a low temperature and characterized NH2-functionalized SWCNTs which were prepared by defluorinating the remaining fluorine groups via a hydrazine treatment. It is evident from the results of the Kaiser test and X-ray photoelectron spectroscopy that a few primary amine groups were functionalized onto the nanotubes. The average number of NH2 groups in the NH2-functionalized SWCNTs was 21.5 μmol/g. One primary amine group was functionalized per about 500 carbon atoms on the outermost surface of the bundled nanotube frame. The zeta potential of the SWCNTs was found to be +14 mV (pH = 3.0) and the specific capacitance of the NH2-SWCNTs was approximately 1.7 times higher than the hc-SWCNTs at a scan rate of 10 mV/s, which indicated the functionalization effect of the primary amine groups.

Original languageEnglish
Pages (from-to)360-371
Number of pages12
JournalCarbon
Volume172
DOIs
Publication statusPublished - 2021 Feb

Keywords

  • Capacitance
  • Fluorination
  • Functionalization
  • Primary amine groups
  • Single-walled carbon nanotubes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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