Journal Articles Science Year : 2018

Entropy driven stability of chiral single-walled carbon nanotubes

Abstract

Single-walled carbon nanotubes are hollow cylinders, that can grow centimeters long by carbon incorporation at the interface with a catalyst. They display semi-conducting or metallic characteristics, depending on their helicity, that is determined during their growth. To support the quest for a selective synthesis, we develop a thermodynamic model, that relates the tube-catalyst interfacial energies, temperature, and the resulting tube chirality. We show that nanotubes can grow chiral because of the configurational entropy of their nanometer-sized edge, thus explaining experimentally observed temperature evolutions of chiral distributions. Taking the chemical nature of the catalyst into account through interfacial energies, structural maps and phase diagrams are derived, that will guide a rational choice of a catalyst and growth parameters towards a better selectivity.
Fichier principal
Vignette du fichier
Magnin_for_ArXiV_ss_SuppMat.pdf (1.25 Mo) Télécharger le fichier
Origin Files produced by the author(s)

Dates and versions

hal-01737797 , version 1 (19-03-2018)
hal-01737797 , version 2 (11-09-2018)

Identifiers

Cite

Yann Magnin, Hakim Amara, François Ducastelle, Annick Loiseau, Christophe Bichara. Entropy driven stability of chiral single-walled carbon nanotubes. Science, 2018, 362, pp.212-215. ⟨10.1126/science.aat6228⟩. ⟨hal-01737797v2⟩
255 View
199 Download

Altmetric

Share

More