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Revealing the impact of catalyst phase transition on carbon nanotube growth by in situ Raman spectroscopy.

Authors
  • Rao, Rahul
  • Pierce, Neal
  • Liptak, David
  • Hooper, Daylond
  • Sargent, Gordon
  • Semiatin, S Lee
  • Curtarolo, Stefano
  • Harutyunyan, Avetik R
  • Maruyama, Benji
Type
Published Article
Journal
ACS Nano
Publisher
American Chemical Society
Publication Date
Feb 26, 2013
Volume
7
Issue
2
Pages
1100–1107
Identifiers
DOI: 10.1021/nn304064u
PMID: 23343776
Source
Medline
License
Unknown

Abstract

The physical state of the catalyst and its impact on the growth of single-walled carbon nanotubes (SWNTs) is the subject of a long-standing debate. We addressed it here using in situ Raman spectroscopy to measure Fe and Ni catalyst lifetimes during the growth of individual SWNTs across a wide range of temperatures (500-1400 °C). The temperature dependence of the Fe catalyst lifetimes underwent a sharp increase around 1100 °C due to a solid-to-liquid phase transition. By comparing experimental results with the metal-carbon phase diagrams, we prove that SWNTs can grow from solid and liquid phase-catalysts, depending on the temperature.

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