The structures of zig-zag-zig-zag, armchair-zig-zag, zig-zag-chiral, armchair-armchair, armchair-chiral, and chiral-chiral pair connections produced by single-walled carbon nanotubes 1.5-5.0 diameter with the use of the combined 5-7 and 4-8 topological defects were calculated using molecular mechanics methods. It was established that use of the combined 5-7 topological defect made it possible to produce connections between pairs of single-walled carbon nanotubes with any conductivities, chiralities and diameters, whereas the use of the combined 4-8 topological defect provided a means for forming connections only between nanotubes having the same type of conductivity. The angles between the axes of nanotubes connected by the combined 5-7 and 4-8 topological defects lie in the ranges 145 to 180° and 112 to 178°, respectively. It was found that there were correlations between structural parameters of the connections and the relative arrangement of the simple topological defects in the combined topological defects.

Structure of Connections of Single-Walled Carbon Nanotubes with the Use of the Combined 5-7 and 4-8 Topological Defects. E.A.Belenkov, Y.A.Zinatulina: Physics of the Solid State, 2010, 52[4], 868-75