Hydrogen is expected to become an ideal candidate for
renewable and cleaner energy carrier and to progressively
replace the existing fossil fuels, at least when the issue of how it can be stored safely and cheaply is resolved. So far only few technologies for storing hydrogen fuel have been adopted by automobile factories , but these systems present significant disadvantages.
Most recently, tremendous interest have been aroused by the
discovery of the hydrogen adsorption capacity in carbon
materials , such as nanoporous carbon or nanofibers, and particularly carbon nanotubes (CNTs) because of their unique physical/chemical properties and their potential applications. In particular, since their very low density and high porosity, they are potentially useful as a safe hydrogen storage , although in the literature the actual amount of hydrogen uptake in CNTs
In this work we report about growth of carbon nanotubes,
carbon fibers and nanographite obtained by thermal CVD  by co-evaporating of either solid or liquid carbon precursor in presence of metal catalysts, such as ferrocene. The morphology and structure of our samples, grown at different conditions, were characterized by SEM, HR-TEM and BET analyses.
Furthermore spectroscopic tools were employed both in
characterization of carbon nanotubes and their interaction with hydrogen atmosphere, in order to investigate the mechanism in which hydrogen is adsorbed onto different kind of nanotube samples. Physical and chemical properties were investigated by Raman, FT-IR and ESR spectroscopy.