Growth mechanism of single-walled carbon nanotubes on iron-copper catalyst and chirality studies by electron diffraction

Maoshuai He, Bilu Liu, Alexander I. Chernov, Elena D. Obraztsova, Inkeri Kauppi, Hua Jiang, Ilya Anoshkin, Filippo Cavalca, Thomas W. Hansen, Jakob B. Wagner, Albert G. Nasibulin, Esko I. Kauppinen, Juha Linnekoski, Marita Niemelä, Juha Lehtonen

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60 Citations (Scopus)

Abstract

Chiralities of single-walled carbon nanotubes grown on an atomic layer deposition prepared bimetallic FeCu/MgO catalyst were evaluated quantitatively using nanobeam electron diffraction. The results reveal that the growth yields nearly 90% semiconducting tubes, 45% of which are of the (6,5) type. The growth mechanisms as well as the roles of different components in the catalyst were studied in situ using environmental transmission electron microscopy and infrared spectroscopy. On the basis of the understanding of carbon nanotube growth mechanisms, an MgO-supported FeCu catalyst was prepared by impregnation, showing similar catalytic performance as the atomic layer deposition-prepared catalyst, yielding single-walled carbon nanotubes with a similar narrow chirality distribution.

Original languageEnglish
Pages (from-to)1796-1801
Number of pages6
JournalChemistry of Materials
Volume24
Issue number10
DOIs
Publication statusPublished - 22 May 2012
Externally publishedYes

Keywords

  • electron diffraction
  • iron-copper catalyst
  • semiconducting SWNTs
  • single-walled carbon nanotube

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