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SURFACE ENHANCED RAMAN SCATTERING AND PHOTOLUMINESCENCE STUDIES ON SINGLE-WALLED CARBON NANOTUBES SUBMITTED TO NON-HYDROSTATIC COMPRESSION

M. Baibarac1, I. Baltog1,* , L. Mihut1, N. Preda1, T. Velula1, C. Godon2, J. Y. Mevellec2, J. Wéry2, S. Lefrant2

Affiliation

  1. National Institute of Materials, Lab. of Optics and Spectroscopy, P. O. Box MG-7, RO-77125, Bucharest, Romania
  2. Institut de Materiaux de Nantes, Laboratoire de Physique Cristalline, 2 Rue de la Houssiniere, B.P. 32229, 44322 Nantes, France

Abstract

Single-walled carbon nanotubes (SWNTs) under a moderate non-hydrostatic pressure, of 0.58 GPa, undergo a non-reversible transformation. Due to the plastic deformations, structural defects and carbon nanotube fragments of different size are produced. Short fragments of spherical or ellipsoidal form, behaving as closed-shell fullerenes are observed both by Raman spectroscopy and photoluminescence (PL). The main vibrational indicative of the fragments of shorter length is the band at ~ 1458 cm-1 that is regularly observed in the Raman spectra of fullerene. Similar to fullerenes self assemblies, the interaction between the nanotube fragments is noticed in the Raman spectrum by the band at ~ 94 cm-1 that reveals an inter-particle vibration mode. When the nanotubes are dispersed into host matrix, as aromatic hydrocarbons (AHs) with isolated or condensed phenyl rings, supplementary mechanico-chemical reactions take place. For AHs with isolated phenyl rings, like biphenyl or p-terphenyl, a chemical functionalization of SWNT fragments is demonstrated by the appearance of a new Raman band at 1160 cm-1. In PL spectra, the interaction of SWNTs with AHs, is noticed by a detailed vibronic structure appearing in the high energy side of the emission spectrum , that increase with the weight of SWNTs in the AHs/SWNTs mixtures..

Keywords

Carbon nanotubes, Non-hydrostatic compression, Aromatic hydrocarbons, Raman spectroscopy, Photoluminescence.

Submitted at: July 4, 2005
Accepted at: July 21, 2005

Citation

M. Baibarac, I. Baltog, L. Mihut, N. Preda, T. Velula, C. Godon, J. Y. Mevellec, J. Wéry, S. Lefrant, SURFACE ENHANCED RAMAN SCATTERING AND PHOTOLUMINESCENCE STUDIES ON SINGLE-WALLED CARBON NANOTUBES SUBMITTED TO NON-HYDROSTATIC COMPRESSION, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 4, pp. 2173-2181 (2005)