Desorption kinetics and interaction of Xe with single-wall carbon nanotube bundles

Details Desorption kinetics and interaction of Xe with single-wall carbon nanotube bundles Desorption kinetics and interaction of Xe with single-wall carbon nanotube bundles

2002-04-08

arxiv.org/abs/cond-mat/0204175v1

Chem. Phys. Lett. 363 (2002) 252-260

Physics

Condensed Matter

8 pages, 5 figures

Scientific paper

10.1016/S0009-2614(02)01175-2

We present a study on the kinetics of xenon desorption from single-wall carbon nanotube (SWNT) bundles using thermal desorption spectroscopy (TDS). TD-spectra from SWNT samples show a broad desorption feature peaked at significantly higher temperature than the corresponding low-coverage desorption feature on graphite. The observations are explained using a coupled desorption-diffusion (CDD) model, which allows the determination of the low-coverage Xe binding energy for adsorption on SWNT bundles, 27 kJ/mol. This energy is about 25% higher than the monolayer binding energy on graphite, 21.9 kJ/mol. By comparison with molecular mechanics calculations we find that this increase of the binding energy is consistent with adsorption in highly coordinated groove-sites on the external bundle surface.

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