Interface effects and termination of finite length nanotubes
  The objective of the present paper is to investigate interface effects in carbon nanotubes. We use both real and k-space tight binding method. We study in detail the effect of wrapping vector on the electronic properties. We analyze the effect of the curvature in closed nanotube to the electronic properties. The finite length of the nanotube affects the electronic properties. 
N. Stefanakis