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

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.

Full Text

Duke Authors

Cited Authors

  • Rao, R; Pierce, N; Liptak, D; Hooper, D; Sargent, G; Semiatin, SL; Curtarolo, S; Harutyunyan, AR; Maruyama, B

Published Date

  • February 26, 2013

Published In

Volume / Issue

  • 7 / 2

Start / End Page

  • 1100 - 1107

PubMed ID

  • 23343776

Electronic International Standard Serial Number (EISSN)

  • 1936-086X

Digital Object Identifier (DOI)

  • 10.1021/nn304064u

Language

  • eng

Citation Source

  • PubMed