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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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https://hal.archives-ouvertes.fr/hal-01706361
Contributor : Hakim Amara <>
Submitted on : Sunday, February 11, 2018 - 3:38:55 PM
Last modification on : Friday, June 26, 2020 - 2:01:07 PM
Document(s) archivé(s) le : Monday, May 7, 2018 - 4:13:23 PM

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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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