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摘要
The appearance of a broad Raman peak at similar to 1550 cm(-1) (G(-) peak) in carbon nanotubes has been conventionally attributed to the presence of metallic nanotubes. Here, we present wavelength-dependent resonant Raman measurements on macroscopic nanotube ensembles enriched in armchair species prepared via density gradient ultracentrifugation. Our data clearly show that the broad G(-) mode is absent for armchair structures and appears only when the excitation laser is resonant with non-armchair "metals." Due to the large number (similar to 10(10)) of nanotubes across several armchair species probed, our work firmly establishes a general correlation between the G-band line shape and nanotube structure.
- 出版日期2011-9-9
