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An Anomalous Enhancement of the A(g)(2) Mode in the Resonance Raman Spectra of C-60 Embedded in Single-Walled Carbon Nanotubes during Anodic Charging

Research output: Contribution to journalJournal article

Published

  • Martin Kalbac
  • Viktor Zolyomi
  • Adam Rusznyak
  • Janos Koltai
  • Jeno Kurti
  • Ladislav Kavan
Journal publication date18/02/2010
JournalThe Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter
Journal number6
Volume114
Number of pages7
Pages2505-2511
Original languageEnglish

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.