Single-walled CNTs molecular structure

For example, Dillon et al. [154] reported a covalent attachment of branched polyethyleneimine (PEI) to the sidewalls of SWNTs through the use of fluorinated single-wall CNTs as precursors. The structural integrity of the original purified SWNT is maintained upon covalent functionalization with PEI. Solid-state NMR shows the presence of carboxylate substituents due to carbamate formation as a consequence of the reversible CO2 absorption to the primary amine substituents of the PEI. Desorption of CO2 is accomplished by heating under argon at 75 °C, while the dependence of the quantity of CO2 absorbed on temperature and the molecular weight of the PEI is also observed. 

Li and Chou [54] 2004 Molecular structural mechanics with 3D space frame-like structures with beams (3,3X8,8) (5,0X14,0) — 0.4-1.2 Buckling behaviors under either compression or bending for both single-and double-walled CNTs... 

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