Raman characterization and hydrogen sorption capacity of Hipco single–walled carbon nanotubes

Raman scattering was used to probe the electronic properties and hence derive the distribution of diameters of thesingle-walled carbon nanotubes (swcnt) in high pressure carbon monoxide sample. micro-gravimetric nitrogenand hydrogen adsorption isotherms were measured at 77k and for gas pressures of up to 1 bar nitrogen and 10 barhydrogen. in this paper we show that the majority of single-walled carbon nanotubes in hipco sample which areexcited by the two laser energies (2.41, 2 ev), are metallic with surface area of 646 m2/g and hydrogen capacity 1.12wt%.