Hydrogen site occupancies in single-walled carbon nanotubes studied by inelastic neutron scattering

P. A. Georgiev, D. K. Ross, A. De Monte, U. Montaretto-Marullo, R. A.H. Edwards, A. J. Ramirez-Cuesta, D. Colognesi

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Abstract

Neutron inelastic scattering spectra from high quality single-wall carbon nanotubes (SWNTs), progressively dosed with hydrogen, have been measured with high resolution at different temperatures in the vicinity of 20 K. The spectra consist of two parts. Firstly, a relatively sharp complex peak, due to scattering from translationally bound molecules undergoing rotational transitions, is observed at around 14.5 meV. Secondly, there is a series of broad features at higher energies originating from roto-vibrational transitions corresponding to J = 0 to 1 rotational change plus n = 0 to n = 1, 2, etc molecular centre-of-mass vibrational transitions, as well as from molecule centre-of-mass recoil. The structure of the complex sharp peak suggests that the molecular hydrogen is adsorbed on at least two different adsorption sites on the surfaces of the nanotube bundles.

Original languageEnglish
Pages (from-to)L73-L78
JournalJournal of Physics Condensed Matter
Volume16
Issue number8
DOIs
StatePublished - Mar 3 2004
Externally publishedYes

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