Effect of Diameter and Doping on Electronic Band Structure of Single-Walled Carbon Nanotubes
Carbon nanotubes (CNTs) are basically graphene roll-up in cylindrical form that can have large value of length-to-diameter ratio. In this paper electrical property such as band-gap, density of states, and energy-dependent conductance of single walled carbon nanotubes is quantumly calculated using density functional theory (DFT). It can be seen that band-gap of different SWCNTs changes with the change in diameter. Density of states and energy dependent conductance is also calculated for different single walled CNTs. It is observed that armchair carbon nanotube band gap remain constant irrespective of the diametric size.