Abstract
A review of the structure of carbon nanotubes doped either by electron donors or electron acceptors is presented. The structure of doped carbon nanotubes probed by X-ray and neutron diffraction and the short range atomic arrangement by TEM and EXAFS spectroscopy were found to depend on the cristallinity and purification treatment of host SWCNTs. The modifications of 2D lattice of SWCNTs ropes induced by doping reactions are examined. The sites of insertion at the surface of bundles, in between the individual tubes or inside the tubes are discussed as a function of the type of dopant and the mode of doping, electrochemical, vapour or liquid phase. Finally, some Raman studies of alkali-doped bundled SWCNTs are reported. The striking dependence of the Raman modes under doping are explained on the basis of structural information.