Resonant Raman Scattering in Carbon Nanotubes

✍ Scribed by C. Thomsen; P.M. Rafailov; H. Jantoljak; S. Reich

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 121 KB
• Volume: 220
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/1521-3951(200007)220:1<561::aid-pssb561>3.0.co;2-t

✦ Synopsis

We present resonant-Raman scattering results on single and multi-walled carbon nanotubes in the range 1.5 to 2.6 eV. In addition to the known resonance of metallic tubes with a maximum at % 1:9 eV we determine the resonance profile of semiconducting single-walled tubes. For a diameter of d 0 1.3 nm it has a flat minimum between 1.8 and 2.3 eV and a resonance above and below that. For tubes with d 0 1:45 A all resonance energies decrease by about 0.1 eV. For multi-walled tubes a monotonic increase in Raman intensity with excitation energy is observed which is explained as a smearing out of the square-root singularities in the electronic density of states of 1D systems.