The dynamics of H2 and N2 sorption in carbon nanotubes

Zs Ötvös, G. Onyestyák, J. Valyon, I. Kiricsi, Z. Kónya, L. V C Rees

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Single-walled and multi-walled carbon nanotubes (SWNT and MWNT) were prepared by catalytic decomposition of methane and acetylene, respectively. The resulting catalyst/carbon composites were subjected to chemical treatments to obtain samples which were enriched in nanotubes. Isotherms and frequency response (FR) spectra of N2 and H2 were recorded at 195 and 77K, respectively, in the 1-800Pa pressure range. The adsorption isotherms for N2 were found to obey Henry's law, while the isotherms of H 2 adsorption indicated some energetic heterogeneity of the sorption sites. Stronger adatom-substrate interaction was detected for those samples which had been subjected to oxidative treatment. The FR measurements showed that treatment of MWNT in KMnO4 solution changed the rate-controlling mechanism of mass transport from one of sorption to one of diffusion. Results substantiated that the surface functional groups, generated by the oxidative treatment, have significant influence on both the equilibrium and the dynamic N2 and H2 sorption properties of the carbon nanotubes.

Original languageEnglish
Pages (from-to)73-76
Number of pages4
JournalApplied Surface Science
Volume238
Issue number1-4 SPEC. ISS.
DOIs
Publication statusPublished - Nov 15 2004

Fingerprint

Carbon Nanotubes
sorption
Sorption
Carbon nanotubes
carbon nanotubes
isotherms
Frequency response
Isotherms
frequency response
Acetylene
Adatoms
Methane
Adsorption isotherms
Henry law
Nanotubes
Functional groups
adsorption
Carbon
Mass transfer
acetylene

Keywords

  • Adsorption
  • Carbon nanotubes
  • Diffusion
  • Rate spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics

Cite this

The dynamics of H2 and N2 sorption in carbon nanotubes. / Ötvös, Zs; Onyestyák, G.; Valyon, J.; Kiricsi, I.; Kónya, Z.; Rees, L. V C.

In: Applied Surface Science, Vol. 238, No. 1-4 SPEC. ISS., 15.11.2004, p. 73-76.

Research output: Contribution to journalArticle

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AU - Onyestyák, G.

AU - Valyon, J.

AU - Kiricsi, I.

AU - Kónya, Z.

AU - Rees, L. V C

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