Desorption kinetic detection of different adsorption sites on opened carbon single walled nanotubes:: The adsorption of n-nonane and CCl4

We show that thermal desorption kinetics clearly resolve adsorbates bound in different sites on single walled carbon nanotube bundles. The molecules n-C(9)H(2)O and CCl(4) were compared and it was found that the nanotube internal sites exhibited the highest desorption temperature, whereas external groove sites exhibited the next highest desorption temperature for both molecules. When n-C(9)H(2)O and CCl(4) coadsorb the more strongly bound n-C(9)H(2)O quantitatively displaces CCl(4) from internal sites to groove sites. Molecular shape governs the capacity of the different sites for the two molecules. (c) 2005 Elsevier B.V. All rights reserved.