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Gas Adsorption Evidence of Single-Wall and Multi-Wall Carbon Nanotube Opening

Published online by Cambridge University Press:  01 February 2011

Moulay-Rachid Babaa ,
Edward McRae ,
Nicole Dupont-Pavlovsky ,
Sandrine Delpeux ,
Francois Beguin ,
Fabrice Valsaque  and
Jaafar Ghanbaja
Moulay-Rachid Babaa
Affiliation:
Laboratoire de Chimie du Solide Minéral, UMR CNRS 7555, Université Henri Poincaré – Nancy 1, B.p. 239, 54506 Vandoeuvre cedex, France
Edward McRae
Affiliation:
Laboratoire de Chimie du Solide Minéral, UMR CNRS 7555, Université Henri Poincaré – Nancy 1, B.p. 239, 54506 Vandoeuvre cedex, France
Nicole Dupont-Pavlovsky
Affiliation:
Laboratoire de Chimie du Solide Minéral, UMR CNRS 7555, Université Henri Poincaré – Nancy 1, B.p. 239, 54506 Vandoeuvre cedex, France
Sandrine Delpeux
Affiliation:
Centre de Recherche sur la Matière Divisée, CNRS-Université, 1B rue de la Férollerie, 45071 Orléans cedex 02, France
Francois Beguin
Affiliation:
Centre de Recherche sur la Matière Divisée, CNRS-Université, 1B rue de la Férollerie, 45071 Orléans cedex 02, France
Fabrice Valsaque
Affiliation:
Laboratoire de Chimie du Solide Minéral, UMR CNRS 7555, Université Henri Poincaré – Nancy 1, B.p. 239, 54506 Vandoeuvre cedex, France
Jaafar Ghanbaja
Affiliation:
Laboratoire de Chimie du Solide Minéral, UMR CNRS 7555, Université Henri Poincaré – Nancy 1, B.p. 239, 54506 Vandoeuvre cedex, France
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Abstract

Carbon nanotubes offer a surface very similar to that of graphite, a reference substrate in physisorption experiments aimed at studying substrate-adsorbate interactions. The curvature, however, introduces new questions. What are the effects of this on condensation pressures or heats of adsorption? Can one experimentally distinguish between different adsorption sites? In this study, we compare adsorption isotherms of several simple gases (Kr, Xe, CCl4) on singlewall (SWNTs) and multi-wall carbon nanotubes (MWNTs), before and after opening. For mechanically opened SWNTs, the accessibility of the adsorption sites and the molecular arrangements of the adsorbed gases are discussed. With the much bigger, well-defined MWNTs, the “cutting method” called upon a nitric acid treatment followed by a CO2 oxidation. TEM investigations and physisorption studies clearly revealed tube opening and that the inner channels became accessible to Kr molecules.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 782: Symposium A – Micro- and Nanosystems , 2003 , A9.5
Copyright
Copyright © Materials Research Society 2004

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References

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