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We present a Raman spectroscopy study of iodine-intercalated (p-type doped) double-walled carbon nanotubes. Double-walled carbon nanotubes (DWCNTs) are synthesized by catalytic chemical vapor deposition (CCVD) and characterized by Raman spectroscopy. The assignment of the radial breathing modes and the tangential modes of pristine DWCNTs is done in the framework of the bond polarization theory, using the spectral moment method. The changes in the Raman spectrum upon iodine doping are analysed. Poly-iodine anions are identified, and the Raman spectra reveal that the charge transfer between iodine and DWCNTs only involves the outer tubes.

International audienceNew one-dimensional (1D) hybrid nanosystems are elaborated withmetalated or metal free phthalocyanine molecules encapsulated into the hollow core ofsingle-walled carbon nanotubes. The X-ray diffraction experiments coupled to simulationallow evidencing the 1D structural organization of the molecules inside the nanotubes. Theangle between the molecule ring and the nanotube axis is close to 32° as determined fromour density functional theory calculations. Confined molecules display Raman spectrahardly altered with respect to the bulk phase, suggesting a rather weak interaction with thetubes. For comparison, noncovalent functionalization at the outer surface of the tube is also investigated. The vibrationalproperties of the molecules functionalized at the outer surface of tubes display important modifications. A significant curvature ofthe phthalocyanine is induced by the interaction with the tube walls, leading to change of the central atom position within themolecular ring, in good agreement with our first-principles calculations