The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics

, Volume 34, Issue 1, pp 279–282

Adsorption of hydrogen on normal and pentaheptite single wall carbon nanotubes

Authors

  • I. Cabria
    • Departamento de Física TeóricaUniversidad de Valladolid
  • M. J. López
    • Departamento de Física TeóricaUniversidad de Valladolid
    • Departamento de Física TeóricaUniversidad de Valladolid
    • Donostia International Physics Center (DIPC)
Quantum Dots, Wires and Nanotubes

DOI: 10.1140/epjd/e2005-00158-9

Cite this article as:
Cabria, I., López, M. & Alonso, J. Eur. Phys. J. D (2005) 34: 279. doi:10.1140/epjd/e2005-00158-9

Abstract.

Density functional calculations of the physisorption of molecular hydrogen and the dissociative atomic chemisorption on the external surface of hexagonal and pentaheptite carbon nanotubes, have been carried out. Physisorption binding energies are near 100 meV/molecule and are similar on metallic and semiconducting nanotubes. Full coverage of the nanotube with one molecule per graphitic hexagon decreases the binding energy per molecule. Chemisorption binding energies per H atom are larger on pentaheptites than on hexagonal carbon nanotubes. The molecular physisorption and dissociative chemisorption states on pentaheptites have very similar total energies (some chemisorbed states are even slightly more stable than the physisorbed states), while on hexagonal carbon nanotubes molecular physisorption is more stable than dissociative chemisorption. However, a substantial energy barrier has to be overcome to go from physisorption to dissociative chemisorption in both types of nanotubes.

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© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005