Polarity determined growth of carbon nanotubes of different alignments

Y. Gao, Y. S. Zhou, W. Xiong, M. Mahjouri-Samani, M. Mitchell, Y. F. Lu

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Growing carbon nanotubes (CNTs) of different alignments, including surface-bounded and vertically aligned arrays, on metallic electrodes was achieved by applying electric voltages of different polarities on metallic electrodes during the laser-assisted chemical vapor deposition process. Surface-bounded CNTs were found to crawl out from the positively charged electrodes. In contrary, vertically aligned CNTs dominated the negatively charged electrodes. The alignment control was ascribed to the movement of catalyst-nanoparticles (NPs) under the influence of external electric field. The surface-bounded CNTs were ascribed to the repulsive forces between the catalyst NPs and the anodes. The vertically aligned CNTs were ascribed to the joint interactions of catalyst-cathode interactions and tube-tube interactions. This investigation suggests a convenient approach to control the alignment of CNT arrays for applications in different fields.

Original languageEnglish (US)
Title of host publicationLaser-based Micro- and Nanopackaging and Assembly IV
StatePublished - 2010
Externally publishedYes
EventLaser-based Micro- and Nanopackaging and Assembly IV - San Francisco, CA, United States
Duration: Jan 26 2010Jan 28 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceLaser-based Micro- and Nanopackaging and Assembly IV
Country/TerritoryUnited States
CitySan Francisco, CA


  • Carbon nanotubes (CNTs)
  • Electrical field polarity
  • Laser-assisted chemical vapor deposition (LCVD)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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