The effects of pre-treatment and catalyst composition on growth of carbon nanofibers at low temperature

Yih Ming Shyu, Franklin Chau-Nan Hong

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)

Abstract

Carbon nanofiber films have been grown on Fe-Ni alloy catalysts at 400°C by a thermal chemical vapor deposition (CVD) method using acetylene as a carbon source. Fe-Ni-C alloy catalysts were found to be more suitable for carbon nanofiber growth at 400°C than pure Ni or Fe-Ni catalysts. When Fe-Ni catalysts were pre-treated in hydrogen at a low temperature (400°C), the catalyst lost its activity in growing carbon nanofibers at 400°C by forming an amorphous carbon layer covering catalytic sites on the surface. The growth rate of carbon nanofibers was improved significantly by pre-treating the catalyst with a low concentration of carbon source (e.g. acetylene, carbon monoxide) forming Fe-Ni-C alloy during the temperature-rising step before growth. Carbon nanofiber walls consisted of imperfect graphite structure as characterized by transmission electron microscopy.

Original languageEnglish
Pages (from-to)1241-1245
Number of pages5
JournalDiamond and Related Materials
Volume10
Issue number3-7
DOIs
Publication statusPublished - 2001 Mar 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering

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