Striking influence of the catalyst support and its acid-base properties: New insight into the growth mechanism of carbon nanotubes

Arnaud Magrez, Rita Smajda, Jin Won Seo, Endre Horváth, Primož Rebernik Ribič, Juan Carlos Andresen, Donatello Acquaviva, Areta Olariu, Gábor Laurenczy, László Forró

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

In the accepted mechanisms of carbon nanotube (CNT) growth by catalytic chemical vapor deposition (CCVD), the catalyst support is falsely considered as a passive material whose only role is to prevent catalytic particles from coarsening. The chemical changes that occur to the carbon source molecules on the surface are mainly overlooked. Here, we demonstrate the strong influence of the support on the growth of CNTs and show that it can be tuned by controlling the acid-base character of the support surface. This finding largely clarifies the CCVD growth mechanism. The CNTs' growth stems from the support where the presence of basic sites catalyzes the aromatization and reduces the complexity of CNT precursor molecules. On basic supports, the growth is activated and CNTs are more than 1000 times longer than those produced on acidic supports. These results could be the bedrock of future development of more efficient growth of CNTs on surfaces of functional materials. Finally, the modification of the aciditiy of the catalyst support during the super growth process is also discussed.

Original languageEnglish
Pages (from-to)3428-3437
Number of pages10
JournalACS Nano
Volume5
Issue number5
DOIs
StatePublished - 24 May 2011
Externally publishedYes

Keywords

  • AlO
  • Amphoteric
  • Brønsted
  • Oxidative dehydrogenation
  • TiO
  • Water

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy

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