Single-walled carbon nanotubes (SWCNT) as well as functionalized nanotubes were studied by means of low temperature Fourier transform infrared (FTIR) absorption spectroscopy. Embedment of carbon nanotubes into KBr (potassium bromide) pellets was found to be one of the most convenient methods to study the nanotubes at room and low temperatures. Low temperature allows us to observe several spectral bands associated with vibrations in the nanotubes. These vibrations were found to be sensitive to the ordering of the carbon atoms in the nanotube therefore it could be used as a signature of the nanotube quality. Infrared spectroscopy was found to be sensitive enough for the monitoring of nanotube functionalization and identification of the particular functional groups attached to the nanotubes. Assignment of spectral bands to particular vibrations of atoms localized in the functional groups attached to the nanotube is supported by ab initio calculations.

 

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