Our study of the adsorption of oxygen molecules on individual semiconductiong single-walled carbon nanotubes at ambient conditions reveals that the adsorption is physisorption, that the resistance without O 2 increases by ~two orders of magnitude as compared to that with O 2 , and that the sensitive response is due to the pinning of the Fermi level near the top of the valence band of the tube resulting from impurity states of O 2 appearing above the valence band.

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We report a parametrization of a previous self consistent tight binding model, suitable for metals with high atomic number in which nonscalar relativistic effects are significant in the electron physics of condensed phases. The method is applied to platinum. The model is fitted to DFT band structures and cohesive energies and spectroscopic data on platinum atoms in 5 oxidation states and is then shown without further parametrization to correctly reproduce several low index surface structures. We also predict reconstructions of some vicinal surfaces.