Interaction between single-wall carbon nanotubes and encapsulated C60 probed by resonance Raman spectroscopy

Abstract

The effects of C₆₀ encapsulation on the radial breathing mode (RBM) frequencies of single-wall carbon nanotubes (SWCNTs) are investigated over a wide range of diameters (d_t∼1.25–1.5 nm). The observed frequency shifts show a characteristic behavior depending on the inter-spacing between C₆₀ and SWCNTs. The present findings clearly indicate the van der Waals nature of the SWCNT-C₆₀ interaction and an importance of hybridization between the electronic states of C₆₀ and SWCNTs.