Gas adsorption evidence of single-wall and multi-wall carbon nanotube opening

Moulay Rachid Babaa, Edward McRae, Nicole Dupont-Pavlovsky, Sandrine Delpeux, Francois Beguin, Fabrice Valsaque, Jaafar Ghanbaja

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

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 single-wall (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.

Original languageEnglish
Pages (from-to)421-426
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume782
DOIs
Publication statusPublished - 2003
EventMicro- and Nanosystems - Boston, MA, United States
Duration: Dec 1 2003Dec 3 2003

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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