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 the Single-Walled Carbon Nanotubes (SWCNT) in high pressure carbon monoxide sample. Micro-Gravimetric nitrogen and hydrogen adsorption isotherms were measured at 77K and for gas pressures of up to 1 bar nitrogen and 10 bar hydrogen. In this paper we show that the majority of single-walled carbon nanotubes in Hipco sample which are excited by the two laser energies (2.41, 2 eV), are metallic with surface area of 646 m/g and hydrogen capacity 1.12 wt%.