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A review: controlled synthesis of vertically aligned carbon nanotubes

  • Hahm, Myung-Gwan (Department of Mechanical Engineering and Materials Science, Rice University) ;
  • Hashim, Daniel P. (Department of Mechanical Engineering and Materials Science, Rice University) ;
  • Vajtai, Robert (Department of Mechanical Engineering and Materials Science, Rice University) ;
  • Ajayan, Pulickel M. (Department of Mechanical Engineering and Materials Science, Rice University)
  • Received : 2011.10.15
  • Accepted : 2011.11.05
  • Published : 2011.12.30
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Abstract

Carbon nanotubes (CNTs) have developed into one of the most competitively researched nano-materials of this decade because of their structural uniqueness and excellent physical properties such as nanoscale one dimensionality, high aspect ratio, high mechanical strength, thermal conductivity and excellent electrical conductivity. Mass production and structure control of CNTs are key factors for a feasible CNT industry. Water and ethanol vapor enhance the catalytic activity for massive growth of vertically aligned CNTs. A shower system for gas flow improves the growth of vertically aligned single walled CNTs (SWCNTs) by controlling the gas flow direction. Delivery of gases from the top of the nanotubes enables direct and precise supply of carbon source and water vapor to the catalysts. High quality vertically aligned SWCNTs synthesized using plasma enhance the chemical vapor deposition technique on substrate with suitable metal catalyst particles. This review provides an introduction to the concept of the growth of vertically aligned SWCNTs and covers advanced topics on the controlled synthesis of vertically aligned SWCNTs.

Keywords

References

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