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Chemical Activation of Single-walled Carbon Nanotubes...


Adsorption isotherms for hydrogen on single walled nanotubes (SWNTs) subjected to vari-

ous types of pretreatment have been measured by a tapered element oscillating mass analyzer.

Isotherms at room temperature over a range of pressures up to 48 bar have been measured. We

demonstrate that activation of the SWNT samples by mild oxidation in CO2, followed by heat

treatment in an inert atmosphere, increases the hydrogen adsorption capacity of the SWNT sam-

ples by about a factor of three at 48 bar. Computer simulations have been performed to model the

adsorption isotherms. Bundles of homogeneous (all the same diameter) and heterogeneous (com-

posed of a number of di®erent diameters) nanotubes have been considered. Isotherms computed

using a standard graphitic potential for the nanotubes give remarkably good agreement with the

experimentally measured isotherms before activation with CO2.

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