Nano Research

, 4:767

In Situ TEM observation of the gasification and growth of carbon nanotubes using iron catalysts

  • Xiaofeng Feng
  • See Wee Chee
  • Renu Sharma
  • Kai Liu
  • Xu Xie
  • Qunqing Li
  • Shoushan Fan
  • Kaili Jiang
Research Article

Abstract

We report the in situ transmission electron microscope (TEM) observation of the catalytic gasification and growth of carbon nanotubes (CNTs). It was found that iron catalysts can consume the CNTs when pumping out the precursor gas, acetylene, at the growth temperature, and reinitiate the growth when acetylene is re-introduced. The switching between gasification and growth of CNTs can be repeated many times with the same catalyst. To understand the phenomenon, thermogravimetric analysis (TGA) coupled with mass spectroscopy was used to study the mechanism involved. It was shown that the residual water molecules in the growth chamber of the TEM react with and remove carbon atoms of CNTs as carbon monoxide vapor under the action of the catalyst, when the precursor gas is pumped out. This result contributes to a better understanding of the water-assisted and oxygen-assisted synthesis of CNT arrays, and provides useful clues on how to extend the lifetime and improve the activity of the catalysts. Open image in new window

Keywords

Carbon nanotubes gasification growth iron catalyst environmental transmission electron microscopy (ETEM) thermogravimetric analysis (TGA) 

Supplementary material

12274_2011_133_MOESM1_ESM.zip (19.7 mb)
Supplementary material, approximately 19.6 MB.

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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Xiaofeng Feng
    • 1
  • See Wee Chee
    • 2
  • Renu Sharma
    • 2
  • Kai Liu
    • 1
  • Xu Xie
    • 1
  • Qunqing Li
    • 1
  • Shoushan Fan
    • 1
  • Kaili Jiang
    • 1
  1. 1.Department of Physics and Tsinghua-Foxconn Nanotechnology Research CenterTsinghua UniversityBeijingChina
  2. 2.Leroy Eyring Center for Solid State ScienceArizona State UniversityTempeUSA
  3. 3.Department of Materials Science and EngineeringUniversity of CaliforniaBerkeleyUSA
  4. 4.Department of Materials Science and EngineerigRensselaer Polytechnic InstituteTroyUSA
  5. 5.National Institute of Science and TechnologyGaithersburgUSA
  6. 6.Department of Materials Science and EngineeringUniversity of Illinois at Urbana-ChampaignUrbanaUSA

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