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Investigation of the effect of catalyst type, concentration, and growth time on carbon nanotube morphology and structure

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2022, 32(7), pp.1729-1743
  • DOI : 10.1007/s42823-022-00381-3
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : April 13, 2022
  • Accepted : July 20, 2022
  • Published : December 1, 2022

Gergeroglu Hazal 1 Ebeoglugil Mehmet Faruk 2

1Nanoscience and Nanoengineering, Dokuz Eylul University
2Department of Metallurgical and Materials Engineering, Dokuz Eylul University

Accredited

ABSTRACT

Different materials have been shown to "catalyze" carbon nanotube (CNT) growth in chemical vapor deposition (CVD) when they become nano-sized particles. Catalysts, which act as a kind of "seed" for CNT growth, show two types of behavior in the CVD method; precipitation of carbon atoms from the eutectic alloy forming a kind of alloy with carbon; the fact that the catalyst remains as a solid phase and forms a carbon surface layer during the CVD process. This study examines the relationship between the iron-group and non-iron-group catalyst types and the catalyst concentration and growth time of CVD-based CNT growth via emphasizing growth mechanisms. The novelty of this work is to compare and evaluate the effects of catalyst type, concentration, and growth time, which are three critical CVD parameters, on the final nanotube morphology. It was utilized five different catalysts (Fe2O3, Fe3O4, Nb2O5, Au, and Pt), three different growth durations (3, 5, and 7 min), and three different catalyst concentrations (2, 4, and 6 wt%) to explore the morphological differences on CNT synthesis by CVD under the same process parameters. The results demonstrated that catalyst type is the most influential parameter in CVD-based CNT synthesis, while catalyst concentration and growth time are indispensable elements for the uniformity and small diameter in the final morphology.

Citation status

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