Influence of hydrogen atom adsorption on electronic properties of carbon nano-tubes

Within the framework of the density functional theory and the local spin density approximation the total density of electronic states of clean and adsorbed by the hydrogen atoms zigzag nano tubes (9,0) are calculated. It was shown that the adsorption of hydrogen atoms on the surface of nano tube significantly changes its electronic properties, changing its conductivity from the metallic into the semiconducting. In the energy band of nano tubes with surface hydrogen atoms the forbidden band of 2 eV appears (authors)