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Journal of Low Temperature Physics

, Volume 185, Issue 1–2, pp 129–137 | Cite as

Commensurate Phases of Kr Adsorbed on Single-Walled Carbon Nanotubes

  • Mamadou T. Mbaye
  • Sidi M. Maiga
  • Silvina M. Gatica
Article

Abstract

In this paper, we show that Krypton atoms form a commensurate solid (CS) phase with a fractional coverage of one krypton atom per every four carbons on zigzag carbon nanotubes. This is a unique phase, different from the \(\sqrt{3} \times \sqrt{3}\)R30\(^\circ \) CS monolayer formed on graphite, which has a lower coverage of one krypton atom per every six carbons. Our prediction disagrees with experiments that observe in nanotubes the same solid structure found on graphite. In order to address this discrepancy, we simulated adsorption of Kr on zigzag and armchair single-walled carbon nanotubes with radii ranging from 4.7 to 28.83 Å. Our simulations confirm that the CS of coverage 1/4 forms on medium-sized zigzag nanotubes. We also found the 1/6-coverage solid on graphene, which represents the infinite-radius limit of a nanotube. Our findings are key to experiments of adsorption on nanotubes where the interpretation and justification of the results are based on the monolayer coverage, such as mass or conductance isotherms measurements.

Keywords

Adsorption Nanotubes Krypton Commensuration 

Notes

Acknowledgments

We are grateful for the support of the Partnership for Reduced Dimension Materials (PRDM), NSF Grant No. DMR1205608 and the Center for Integrated Quantum Materials (CIQM), NSF Grant No. DMR-1231319. We thank Milton Cole and Hye-Young Kim for fruitful comments and discussions. We thank the referees of this paper for their constructive comments.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Mamadou T. Mbaye
    • 1
  • Sidi M. Maiga
    • 1
  • Silvina M. Gatica
    • 1
  1. 1.Department of Physics and AstronomyHoward UniversityWashingtonUSA

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