▎ 摘　　要

The junctions of carbon nanotubes and flat graphene sheets or between nanotubes are structures with various potential applications in building nano- and micro-electromechanical systems. Here we report the results of a continuum approach to the determination of the possible shapes of such junctions based on the continuum limit of the Lenosky potential. For various geometric parameters of the tubes and sheets families of surfaces that are local extrema of the bending energy functional are obtained numerically. Each such surface may be thought of as a possible junction between a carbon nanotube and a flat graphene sheet or between co-axial carbon nanotubes.