Probing charge transfer between shells of double-walled carbon nanotubes sorted by outer-wall electronic type

Martin Kalbac, Alexander A. Green, Mark C Hersam, Ladislav Kavan

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Double-walled carbon nanotubes (DWCNTs) with outer metallic (M) or semiconducting (S) shells were sorted by density-gradient ultracentrifugation and examined by Raman spectroscopy and in situ Raman spectroelectrochemistry. The combination of sorting and the selection of appropriate laser excitation energies allowed the disentanglement of the effects of different variations of the electronic type (M or S) of the inner and outer tubes in DWCNTs on the doping behavior and charge transfer between the inner and outer walls. Charge transfer from the outer tube to the inner tube occurs only if the electronic states of the outer tube are filled with electrons or holes, and if these filled states are higher in energy than those of the inner tube. Therefore, each combination of inner and outer tube (i.e., inner@outer: M@M, M@S, S@M, and S@S) exhibits a distinct behavior. The potential needed to observe the effects of charge transfer between the inner and outer tubes is found to increase in the following order: M@M <S@M <M@S <S@S.

Original languageEnglish
Pages (from-to)9806-9815
Number of pages10
JournalChemistry - A European Journal
Volume17
Issue number35
DOIs
Publication statusPublished - Aug 22 2011

Fingerprint

Carbon Nanotubes
Charge transfer
Carbon nanotubes
Spectroelectrochemistry
Laser excitation
Excitation energy
Electronic states
Sorting
Raman spectroscopy
Doping (additives)
Electrons

Keywords

  • density-gradient ultracentrifugation
  • double-walled carbon nanotubes
  • electrochemistry
  • nanotubes
  • Raman spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Probing charge transfer between shells of double-walled carbon nanotubes sorted by outer-wall electronic type. / Kalbac, Martin; Green, Alexander A.; Hersam, Mark C; Kavan, Ladislav.

In: Chemistry - A European Journal, Vol. 17, No. 35, 22.08.2011, p. 9806-9815.

Research output: Contribution to journalArticle

Kalbac, Martin ; Green, Alexander A. ; Hersam, Mark C ; Kavan, Ladislav. / Probing charge transfer between shells of double-walled carbon nanotubes sorted by outer-wall electronic type. In: Chemistry - A European Journal. 2011 ; Vol. 17, No. 35. pp. 9806-9815.
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