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| Publications [#233966] of Michael J. Therien
Papers Published
- Bonhommeau, S; Deria, P; Glesner, MG; Talaga, D; Najjar, S; Belin, C; Auneau, L; Trainini, S; Therien, MJ; Rodriguez, V, Raman spectroscopic investigation of individual single-walled carbon nanotubes helically wrapped by Ionic, semiconducting polymers,
Journal of Physical Chemistry C, vol. 117 no. 28
(July, 2013),
pp. 14840-14849, American Chemical Society (ACS), ISSN 1932-7447 [doi]
(last updated on 2026/01/15)
Abstract:
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.
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