Template effect of hydrolysis of the catalyst precursor on growth of carbon nanotube arrays

S. H. Liu, X. W. Zhao, T. S. Pan, S. Wu, B. Zeng, H. Z. Zeng, M. Gao, Y. Zhang, W. Huang, Y. Lin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Iron catalyst films for the growth of carbon nanotube (CNT) arrays are prepared using sol-gel technique during different hydrolytic periods. It is shown that the extent of hydrolysis of the catalyst precursor has strong impacts on the size and density of iron catalyst particles, which distributed on surface of the film. The iron catalysts formed big clusters in the early stage of the hydrolysis, whereas the particle size decreased dramatically to approximate 20. nm when the hydrolytic duration is as long as 150. h. The reaction between the hydrolytic product of ethyl orthosilicate and the iron oxide particles effectively influence the structure of catalysts during the process of annealing precursor films and reducing the iron oxide particles into iron catalysts. We believe that the hydrolytic product limits the mobility of the catalyst particles, preventing them from aggregating into big clusters by Ostwald ripening. This catalyst film may be utilized to create a template to control the length and quality of CNTs.

Original languageEnglish (US)
Pages (from-to)34-39
Number of pages6
JournalJournal of Colloid And Interface Science
Volume374
Issue number1
DOIs
StatePublished - May 15 2012

Keywords

  • Carbon nanotubes
  • Ferric nitrate
  • Hydrolysis
  • Iron catalyst particles
  • SiO
  • Sol-gel
  • TEOS

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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