Growth Modes and Chiral Selectivity of Single-Walled Carbon Nanotubes

Abstract : Chemical vapor deposition synthesis of single-walled carbon nanotubes experiments, using Fe catalyst, and alternating methane and carbon monoxide as carbon feedstocks, lead to the reversible formation of junctions between tubes of different diameters. Combined with an atomistic modeling of the tube / catalyst interface, this shows that the ratio of diameters of the tube and its seeding particle, denoting the growth mode, depends on the carbon fraction inside the catalyst. With carbon monoxide, nanoparticles are strongly carbon enriched, and tend to dewet the tube, in a perpendicular growth mode. Cross-checking our results with available reports from the literature of the last decade strongly suggests that these latter conditions should favor the near armchair chiral selectivity observed empirically.
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Article dans une revue
Nanoscale, Royal Society of Chemistry, In press
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https://hal.archives-ouvertes.fr/hal-01706361
Contributeur : Hakim Amara <>
Soumis le : dimanche 11 février 2018 - 15:38:55
Dernière modification le : mardi 13 février 2018 - 01:12:54

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  • HAL Id : hal-01706361, version 1
  • ARXIV : 1802.04029

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Maoshuai He, Yann Magnin, Hua Jiang, Hakim Amara, Esko I. Kauppinen, et al.. Growth Modes and Chiral Selectivity of Single-Walled Carbon Nanotubes. Nanoscale, Royal Society of Chemistry, In press. 〈hal-01706361〉

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