Spectroscopic evidence on weak electron transfer from intercalated iodine molecules to single-walled carbon nanotubes

Yeongri Jung, Seong Ju Hwang, Sung Jin Kim

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The chemical bonding character of iodine-intercalated single-walled carbon nanotube (I- SWNT) has been systematically investigated with combinative X-ray spectroscopies. According to I LI-edge X-ray absorption near-edge structure (XANES) analysis, a white line peak corresponding to 2s → 5p transition shows nearly identical but slightly stronger intensity for the I-SWNT than for neutral iodine, indicative of a weak electron transfer from intercalated iodine to SWNT. In contrast, there are remarkable spectral differences in the I Li-edge XANES spectra of I-SWNT and iodine-intercalated Bi2Sr2CaCu2Oy This allows us to rule out the possibility of negatively charged poly iodide ions in the present I-SWNT sample prepared by vapor-phase reaction. Also, we have found that a contact between iodine and SWNT during the synthesis has negligible influence on the chemical bonding nature of intercalated iodine species. The electron transfer from iodine to SWNT is further supported by C 1s X-ray photoelectron spectroscopy revealing the reduction of carbon in SWNT upon iodine intercalation.

Original languageEnglish
Pages (from-to)10181-10184
Number of pages4
JournalJournal of Physical Chemistry C
Volume111
Issue number28
DOIs
Publication statusPublished - 2007 Jul 19

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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