We report here the computation and measurement of inelastic light scattering from acoustic vibrational modes in single-walled carbon nanotubes (SWNT's). The measurement was made possible by the preparation of a sample of oriented SWNT's, partially aligned by means of a magnetic field. Long-wavelength confined longitudinal acoustic modes are described by a shell model. Their interaction with light is described by a surface elasto-optic effect. From the dispersion relations of acoustic modes we obtain an estimate of the two-dimensional Young's modulus of the single curved graphenic plane forming the SWNT. The result is consistent with the reported SWNT elastic properties.
Dynamic light scattering from acoustic modes in single-walled carbon nanotubes / C. E. Bottani, A. Li Bassi, M. G. Beghi, A. Podestà, P. Milani, A. Zakhidov, R. Baughman, D. A. Walters, R. E. Smalley. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 67:15(2003), pp. 155407.155407.1-155407.155407.6.
Dynamic light scattering from acoustic modes in single-walled carbon nanotubes
A. Podestà;P. Milani;
2003
Abstract
We report here the computation and measurement of inelastic light scattering from acoustic vibrational modes in single-walled carbon nanotubes (SWNT's). The measurement was made possible by the preparation of a sample of oriented SWNT's, partially aligned by means of a magnetic field. Long-wavelength confined longitudinal acoustic modes are described by a shell model. Their interaction with light is described by a surface elasto-optic effect. From the dispersion relations of acoustic modes we obtain an estimate of the two-dimensional Young's modulus of the single curved graphenic plane forming the SWNT. The result is consistent with the reported SWNT elastic properties.
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