Formation of beaded vapor grown carbon nanofibers

Wan Yu Wu, Jyh Ming Ting, Yu Mao Chen

Research output: Contribution to journalArticlepeer-review

Abstract

Carbon nanofibers having interesting smooth, spherical beads are synthesized using a catalyst assisted vapor phase process under various methane/hydrogen mixtures. Fe 1-xS x powders were used as the catalyst. The synthesis temperatures were 1100 °C and 1200 °C, which are lower than the ones used previously for the formation of beaded carbon nanofibers or nanotubes. Unlike the high temperature (≥1300 °C) grown beads that may exhibit a rough surface, all the beads obtained at both 1100 and 1200 °C with various methane concentrations have a smooth surface. The diameter and the linear density (no. of beads per unit fiber length) of the beads do not seem to correlate to the growth temperature and the methane concentration. The linear density is also independent of the growth time. However, the beads grow with time. Although the grown mechanism is not clear at the present time, it seems that a three-dimensional nucleation model plays a role.

Original languageEnglish
Pages (from-to)5435-5439
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume11
Issue number6
DOIs
Publication statusPublished - 2011

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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