High temperature growth of single-walled carbon nanotubes with a narrow chirality distribution by tip-growth mode

Maoshuai He*, Tao Yang, Danhong Shang, Benwu Xin, Alexander I. Chernov, Elena D. Obraztsova, Jani Sainio, Na Wei, Hongzhi Cui, Hua Jiang, Esko Kauppinen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

An MgO supported Co catalyst prepared by atomic layer deposition was applied for the growth of single-walled carbon nanotubes (SWNTs). Different from other catalysts, which generally nucleate SWNTs by base-growth mode, the Co-MgO catalyst uniquely generates SWNTs by tip-growth mode, indicating a weak metal-support interaction. During chemical vapor deposition process, the lift-off of Co nanoparticles from support inhibits the aggregation of Co nanoparticles and favors the synthesis of small-diameter SWNTs with a narrow chirality distribution, even at a high reaction temperature. Particularly, product grown at 800 °C maintains a preferential synthesis of small-diameter (6, 5) SWNTs. The enrichment of (6, 5) SWNT arises from the combination of SWNT-catalyst interface thermodynamics with growth kinetic. The growth dynamics of SWNTs was further investigated by in situ Raman spectroscopy, which revealed that SWNTs with smaller diameters appeared prior to the growth of large-diameter counterparts.

Original languageEnglish
Pages (from-to)344-350
Number of pages7
JournalChemical Engineering Journal
Volume341
DOIs
Publication statusPublished - 1 Jun 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Chirality-selective
  • Metal-support interaction
  • Raman spectroscopy
  • Single-walled carbon nanotube
  • Temperature-programmed reduction
  • Tip growth

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