چكيده لاتين :
We have studied the effect of impurity on electronic properties of single-walled carbon nanotubes using Density Functional
Theory. Electronic band structures and density of states of (4, 4) and (7, 0) carbon nanotubes in the presence of different amount
of B and N impurities were calculated. It was found that these impurities have significant effect on the conductivity of carbon
nanotubes. The metallic (4, 4) nanotube remains to be metallic after doping with B and N. The electronic properties of small gap
semiconducting (7, 0) tube can extensively change in the presence of impurity. Our results indicate that B-doped and N-doped (7,
0) carbon nanotubes can be p-type and n-type semiconductors, respectively.
