This work focuses on the high pressure Raman study of carbon nanotube structures comprising of single or multiwall tubes. The detailed examination of the Raman peaks as a function of pressure, especially those attributed to the radial breathing modes (RBM) of the inner and outer tubes of the structure, provides a wealth of information concerning the pressure response of individual nanotubes as well as the inner-outer tube (intratube) interactions. The pressure response of the inner tubes, expressed by the normalized pressure slopes γ_i= (1/ω_i) (δω_i/δP) vs. frequency of their RBMs, shows a remarkable grouping in quasi-linear distributions wherein G_i increases with w. This behaviour is explained by assuming that the pressure response of an internal tube is strongly dependent on the intratube spacings and thus the structural characteristics of the encapsulating tube. This information is of particular interest for the characterization of carbon nanotubes as well as in evaluating the encapsulation effects on systems incorporated in these structures.

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1. Structural and optical characterization of thick InN epilayers grown on GaN templates by plasma assisted molecular beam epitaxy