A first principles study of NO2 chemisorption on silicon carbide nanotubes

Using methods based on first principles, we find that an NO2 molecules can be chemisorbed on silicon carbide nanotubes (SiCNTs) with an appreciable binding energy (similar to-1.0 eV), and that this is not the case for either carbon nanotubes (CNTs) or boron nitride nanotubes (BNNTs). A detailed analysis of the energetics, geometry, and electronic structure of various isomers of the complexes was performed. The SiC-NT-NO2 complex can be metallic or nonmetallic depending on the type of adsorption site and the chirality of the tube. However, our analysis of the electronic structure predicts that a strong p-type effect of the adsorption turns semiconducting systems into metallic ones at room temperature, irrespective of the chirality of the tube. (C) 2008 Elsevier B.V. All rights reserved.