Effects of adsorbed gas on the electrical conductivity of metallic carbon nanotubes

We study the gas molecule adsorption effects on the electrical conductivity of both zigzag (9, 0) and armchair (5, 5) carbon nanotubes. Using the tight-binding model, Green’s function technique and coherent potential approximation, it is found that the adsorption of some gas molecules can cause a change in the electrical conductivity of metallic single-walled carbon nanotubes.