The vibrational and electronic properties of hydrogen molecules adsorbed on single-wall carbon nanotubes were investigated by high-resolution electron-energy-loss spectroscopy. We found that the adsorption of H-2 molecules is dissociative at room temperature and 2.6x10(-2) Pa. The C-H bond formed upon hydrogen adsorption has a vibrational energy equal to 360 meV, in agreement with the expected sp(2)-sp(3) H-induced local rehybridization. The hydrogenation of carbon nanotubes also gives rise to significant changes for both the line shape and the excitation energy of the pi plasmon. Upon H adsorption, the plasmon shifts by 0.8 eV towards lower energies and, moreover, a weak feature rises up at 3.5 eV.

Vibrational and electronic properties of hydrogen adsorbed on single-wall carbon nanotubes

G. CHIARELLO;AGOSTINO, Raffaele Giuseppe;CARUSO, Tommaso;V. FORMOSO;
2004-01-01

Abstract

The vibrational and electronic properties of hydrogen molecules adsorbed on single-wall carbon nanotubes were investigated by high-resolution electron-energy-loss spectroscopy. We found that the adsorption of H-2 molecules is dissociative at room temperature and 2.6x10(-2) Pa. The C-H bond formed upon hydrogen adsorption has a vibrational energy equal to 360 meV, in agreement with the expected sp(2)-sp(3) H-induced local rehybridization. The hydrogenation of carbon nanotubes also gives rise to significant changes for both the line shape and the excitation energy of the pi plasmon. Upon H adsorption, the plasmon shifts by 0.8 eV towards lower energies and, moreover, a weak feature rises up at 3.5 eV.
2004
ADSORPTION; STORAGE; GRAPHITE
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/141081
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