Molecular Dynamics Observation of Iron-Carbon Precursors of Carbon Nanotube and Development of Iron-Carbon Potential

Authors

  • Kazuki Nishi Hiroshima University
  • Shuhei Inoue Hiroshima University
  • Yukihiko Matsumura Hiroshima University

DOI:

https://doi.org/10.4186/ej.2013.17.5.19

Keywords:

molecular dynamic simulation, DFT calculation, cluster

Abstract

We have focused on the growth process of metal and carbon mixed clusters that are precursors for carbon nanotubes. The molecular dynamics method using the Brenner potential was employed for modeling carbon-carbon interactions as well as carbon-iron interactions. As for carbon-iron interactions, the parameters were derived using DFT calculation. The Finnis-Sinclair potential was employed for irons. In order to observe the deposition process of carbon atoms, we adjusted the potential parameters to reproduce the bulk melting points of graphite, iron, and cementite, which was a model material of iron-carbon composite. We observed the initial growth process by preparing iron-carbon mixed clusters (approximately 200 iron atoms and 70 carbon atoms) as precursor clusters. Additional carbon atoms were then gradually supplied to this mixture at 1000 K and 1200 K. Consequently, the graphite structure was formed on the mixture surface, but at some phases, the cap structure was observed at 1200 K.

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Author Biographies

Kazuki Nishi

Department of Mechanical Science Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan

Shuhei Inoue

Department of Mechanical Science Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan

Yukihiko Matsumura

Energy and Environmental Engineering Division, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan

Published

Vol 17 No 5, Dec 31, 2013

How to Cite

[1]
K. Nishi, S. Inoue, and Y. Matsumura, “Molecular Dynamics Observation of Iron-Carbon Precursors of Carbon Nanotube and Development of Iron-Carbon Potential”, Eng. J., vol. 17, no. 5, pp. 19-28, Dec. 2013.