Observation and formation mechanism of stable face-centered-cubic Fe nanorods in carbon nanotubes

Hansoo Kim, Michael J. Kaufman, Wolfgang M. Sigmund, David Jacques, Rodney Andrews

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


The crystallographic structure and orientation of iron nanoparticles present in carbon nanotubes (CNTs) was studied when iron was used as a catalyst. It was found that while most of the nanoparticles encapsulated inside the CNTs had the expected α-Fe (body-centered-cubic) phase, a significant number of them formed and retained the ́-Fe (face-centered-cubic) phase that is not the normal bulk phase at room temperature (nor even expected to form at the growth temperature used). It was also found iron particles at the tips of the nanotubes were either α-Fe or cementite (Fe3C). On the basis of these observations and thermodynamics, a mechanism for the formation of these particles and insights into CNT growth is proposed.

Original languageEnglish
Pages (from-to)1104-1108
Number of pages5
JournalJournal of Materials Research
Issue number5
StatePublished - May 2003

Bibliographical note

Funding Information:
This work was supported by Defense Advanced Research Projects Agency (DARPA)/Army Research Office under Grant No. DAAD19-00-1-0002 through the Center for Materials in Sensors and Actuators (MINSA).

Copyright 2017 Elsevier B.V., All rights reserved.

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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