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Resonant Raman Scattering in Carbon Nanotubes

C. Thomsen, P. M. Rafailov, H. Jantoljak, Stephanie Reich

Open publisher page 8 citations

Abstract

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 d0 = 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 Å 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.

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What this paper is about

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 d0 = 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 Å 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.

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Available abstract

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 d0 = 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 Å 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.

Key concepts: Resonance (particle physics), Carbon nanotube, Raman spectroscopy, Raman scattering, Materials science, Excitation, Atomic physics, Range (aeronautics)

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