Journal of the American Chemical Society · 2011 · 34 citations · 14 references
Natural SciencesChemistryPhysicsNanotechnologyPhysical ChemistrySpectroscopyCarbon NanomaterialsInfrared SpectroscopyMolecular RotationMolecular StructureRotational StructureSelf-assembly Of NanomaterialsCarbon NanohornsCarbon-based NanomaterialsCarbon-based NanostructuresMolecular Orientation At SurfacesSurface Chemistry Of Carbon NanomaterialsVibrational Absorption BandsVibrational Bands
Vibrational-rotational properties of CH(4) adsorbed on the nanopores of single-wall carbon nanohorns (SWCNHs) at 105-140 K were investigated using IR spectroscopy. The difference vibrational-rotational bands of the ν(3) and ν(4) modes below 130 K show suppression of the P and R branches, while the Q branches remain. The widths of the Q branches are much narrower than in the bulk gas phase due to suppression of the Doppler effect. These results indicate that the rotation of CH(4) confined in the nanospaces of SWCNHs is highly restricted, resulting in a rigid assembly structure, which is an anomaly in contrast to that in the bulk liquid phase.
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