An anomalous enhancement of the Ag(2) mode in the resonance raman spectra of C60 embedded in single-walled carbon nanotubes during anodic charging

Martin Kalbac, Viktor Zólyomi, Ádám Rusznyák, János Koltai, Jeno Kürti, Ladislav Kavan

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The effect of electrochemical charging on C60 fullerenes embedded in single-walled carbon nanotubes (peapods) has been studied. The Raman Ag(2) mode of C60 fullerene has been used as a probe. The spectra were measured using seven different laser excitation energies. For cathodic charging we observed bleaching of the Ag(2) mode independent of laser excitation energy. On the other hand for anodic charging the behavior of the Ag(2) mode was dependent on laser excitation energy. The intensity of the Ag(2) mode decreased only for the 1.16 eV laser excitation energy. In the case of other laser excitation energies (2.70, 2.60, 2.54, 2.41, 2.33, 2.18 eV) an increase of intensity has been observed. The dependence of the slope of the intensity on the electrode potential has been found to be a function of laser excitation energy. Observation of the upshift of the Ag(2) frequency supported by first principles calculations suggests that only a small amount of charge penetrates the nanotube, resulting in partial charge on the encapsulated fullerenes.

Original languageEnglish
Pages (from-to)2505-2511
Number of pages7
JournalJournal of Physical Chemistry C
Volume114
Issue number6
DOIs
Publication statusPublished - Feb 18 2010

ASJC Scopus subject areas

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

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