Changes in the vibrational response of single-walled carbon nanotubes resulting from the introduction of structural defects were studied using resonance Raman spectroscopy. Structural defects were introduced into the single-walled carbon nanotubes by subjecting them to carboxylation for various intervals of time. Various Raman modes were observed, including the D, G/G-, G’ modes, and new defect induced modes were identified. Weaker vibrational modes corresponding to Stone-Wales defects with specific structures known as Haeckelites were identified. These modes were compared with the theoretically calculated modes and correlated to O5,6,7 and R5,7 Haeckelite structures.

A Resonance Raman Study of Carboxyl Induced Defects in Single-Walled Carbon Nanotubes. J.Talla, D.Zhang, M.Kandadai, A.Avadhanula, S.Curran: Physica B, 2010, 405[21], 4570-3