Lattice dynamics

Experimental study of lattice dynamics in individual semiconducting double-walled carbon nanotubes: Tangential $G$ modes

D. I. Levshov^a, H. N. Tran^b, Yu. S. Slabodyan^a, A. V. Osadchii^cd, S. B. Roshal'^a, Yu. I. Yuzyuk<sup>a

a</sup> Southern Federal University, Rostov-on-Don
^b Laboratoire Charles Coulomb UMR 5221, Université de Montpellier, CNRS, Montpellier, France
^c Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow
^d National Engineering Physics Institute "MEPhI", Moscow

Abstract: The tangential $G$ modes in individual semiconducting double-walled nanotubes have been examined via Raman spectroscopy over a wide laser excitation wavelength range. Individual suspended nanotubes have been synthesized via chemical vapor deposition. The $(n,m)$ chirality indices are determined via electron diffraction and high-resolution transmission electron microscopy. The pronounced shift in the tangential modes compared to the analogous modes of single-walled nanotubes has been observed in Raman spectra of double-walled nanotubes. The shift value is shown to depend on the interlayer distance and on the van der Waals interaction between the layers in a double-walled tube.

Received: 04.07.2016

DOI: 10.21883/FTT.2017.02.44057.274

 English version: Physics of the Solid State, 2017, 59:2, 338–343

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