On the influence of non‐nearest neighbor interactions and anharmonicity on the atomic properties of a crystal surface: one‐dimensional model

Rabelo, J. N. Teixeira; Zubov, V. I.; Silva, A. L. C. da

doi:10.1002/pssb.200301557

Cited by 2 publications

(1 citation statement)

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“…Moreover, the presence of such effect is more convincing when it is exhibited in a band which is not nanotube diameter sensitive. Theoretical studies based on unsymmetrized self-consistent approximation, by Rabelo et al 24 show that in addition to the nearest neighbors, the nonnearest neighbors give significant contribution to the crystal's surface atomic properties such as lattice relaxation and dynamics, which are relevant to the optical phonons of the DWNTs. Therefore, the additional interactions ͑force constants and charge transfer͒ due to the Se atoms incorporated in the inner tube space inevitably have changed the phonon characteristics of the DWNTs.…”

Section: Resultsmentioning

confidence: 99%

Micro-Raman scattering of selenium-filled double-walled carbon nanotubes: Temperature study

Sendova

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Flahaut

2009

Journal of Applied Physics

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Selenium-filled double-walled carbon nanotubes (Se@DWNT) have been studied by high resolution transmission electron microscopy (HRTEM) and micro-Raman spectroscopy in the temperature interval from 80to600K employing 785nm excitation wavelength. The temperature dependences of the dominant bands (G-band and G′-band) are analyzed in terms of the model developed by Klemens [Phys. Rev. 148, 845 (1966)], Hart et al. [Phys. Rev. B 1, 638 (1970)], Cowley [J. Phys. (France) 26, 659 (1965)] and extended by Balkanski et al. [Phys. Rev. B 26, 1928 (1983)] for anharmonic decay of optical phonons. The findings were compared to analogous study for empty double-walled carbon nanotubes (DWNTs). The DWNT interatomic force constant modification as a result of the presence of the Se atoms inside the tubes is revealed through larger anharmonicity constants describing the temperature dependences of the G′-band and the inner tube tangential modes (G-band).

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Section: Resultsmentioning

confidence: 99%