Dynamic observations of the effect of pressure and temperature conditions on the selective synthesis of carbon nanotubes

Renu Sharma, Peter Rez, Megan Brown, Gaohui Du, Michael Treacy

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

In situ transmission electron microscopy studies have been carried out to determine the effect of temperature and pressure on the growth of carbon nanotubes by the Ni-catalyzed chemical vapour deposition of acetylene. The temperature range explored was 450-650°C and the acetylene pressure range was 0.8-20 mTorr. Our observations show that straight, single-wall, carbon nanotubes tend to form at higher temperatures and lower pressures while bent, zigzag, multi-wall carbon nanotubes form at lower temperatures and higher pressures. These results can be understood as the result of competition between the arrival rate of carbon and the nucleation rate of carbon hexagons (which increases at high pressure and low temperature), and the annealing rate of the 5-ring and 7-ring defects that are responsible for the nanotube curvature.

Original languageEnglish (US)
Article number125602
JournalNanotechnology
Volume18
Issue number12
DOIs
StatePublished - Mar 28 2007

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Carbon Nanotubes
Carbon nanotubes
Acetylene
Carbon
Temperature
Nanotubes
Chemical vapor deposition
Nucleation
Annealing
Transmission electron microscopy
Defects

ASJC Scopus subject areas

  • Materials Science(all)
  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Dynamic observations of the effect of pressure and temperature conditions on the selective synthesis of carbon nanotubes. / Sharma, Renu; Rez, Peter; Brown, Megan; Du, Gaohui; Treacy, Michael.

In: Nanotechnology, Vol. 18, No. 12, 125602, 28.03.2007.

Research output: Contribution to journalArticle

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