Raman spectroscopic investigation of individual single-walled carbon nanotubes helically wrapped by Ionic, semiconducting polymers

Journal Article (Journal Article)

Raman-active vibrational modes of (6,5) chirality-enriched single-walled carbon nanotubes (SWNTs), helically wrapped by semiconducting poly[2,6-{1,5-bis(3-propoxysulfonic acid sodium salt)}naphthylene]ethynylene (PNES), are described in great detail. At an irradiation wavelength of 568.2 nm, the extent to which the environment impacts the nanotube vibrational signature can be probed; in particular, the absence of a G band shift for PNES-[(6,5) SWNT] samples relative to benchmark surfactant-coated nanotubes indicates the lack of any significant charge transfer between the PNES strand and the SWNT skeleton, but electronic spectra provide compelling evidence for polymer-to-SWNT energy transfer. At an irradiation wavelength of 457.9 nm, vibrational modes associated with PNES chains that wrap (6,5) SWNTs are conspicuously enhanced. Under 514.5 nm irradiation, PNES-[(6,5) SWNTs] are not excited in resonance but G and G′ bands associated with these nanohybrids are strongly enhanced, reflecting the excitation of a multiphonon-mediated vibronic transition of the (6,5) SWNT backbone. At a 488.0 nm irradiation wavelength, Raman spectral signatures of both the PNES polymer and the vibronically excited (6,5) SWNT skeleton through one-phonon-assisted processes are pronounced, demonstrating that a specific SWNT chirality and the corresponding semiconducting polymer helically wrapped about its surface can be probed using an excitation wavelength that does not resonantly excite the SWNT structure. © 2013 American Chemical Society.

Full Text

Duke Authors

Cited Authors

  • Bonhommeau, S; Deria, P; Glesner, MG; Talaga, D; Najjar, S; Belin, C; Auneau, L; Trainini, S; Therien, MJ; Rodriguez, V

Published Date

  • July 18, 2013

Published In

Volume / Issue

  • 117 / 28

Start / End Page

  • 14840 - 14849

Electronic International Standard Serial Number (EISSN)

  • 1932-7455

International Standard Serial Number (ISSN)

  • 1932-7447

Digital Object Identifier (DOI)

  • 10.1021/jp4037606

Citation Source

  • Scopus