Raman Spectroscopy of Single-Wall Boron Nitride Nanotubes

Nano Letters 6, 1812 - 1816 (2006)

Raman Spectroscopy of Single-Wall Boron Nitride Nanotubes

R. Arenal, A.C. Ferrari, S. Reich, L. Wirtz, J.-Y. Mevellec, S. Lefrant, A. Rubio, A. Loiseau

Single-wall boron nitride nanotubes samples synthesized by laser vaporization of a hexagonal BN target under a nitrogen atmosphere are studied by UV and visible Raman spectroscopy. We show that resonant conditions are necessary for investigating phonon modes of BNNTs. Raman excitation in the UV (229 nm) provides pre-resonant conditions, allowing the identification of the A1 tangential mode at 1370 cm−1. This is 5 cm−1 higher than the E2g mode in bulk h-BN. Ab-initio calculations show that the lower frequency of bulk h-BN with respect to large diameter nanotubes and the single sheet of h-BN is related to a softening of the sp2 bonds in the bulk due to inter-layer interaction.

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