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The effects of confining molecular hydrogen within carbon nanohorns arestudied via high-resolution quasielastic and inelastic neutron spectroscopies.Both sets of data are remarkably different from those obtained in bulk samplesin the liquid and crystalline states. At temperatures where bulk hydrogen isliquid, the spectra of the confined sample show an elastic component indicatinga significant proportion of immobile molecules as well as distinctly narrowerquasielastic line widths and a strong distortion of the line shape of the para- ortho rotational transition. The results show that hydrogen interacts farmore strongly with such carbonous structures than it does to carbon nanotubes,suggesting that nanohorns and related nanostructures may offer significantlybetter prospects as lightweight media for hydrogen storage applications.

Nature of the bound states of molecular hydrogen in carbon nanohorns