Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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A Synthesis of High Purity Single-Walled Carbon Nanotubes from Small Diameters of Cobalt Nanoparticles by Using Oxygen-Assisted Chemical Vapor Deposition Process

  • Byon, Hye-Ryung (Department of Chemistry, Pohang University of Science and Technology) ;
  • Lim, Hyun-Seob (Department of Chemistry, Pohang University of Science and Technology) ;
  • Song, Hyun-Jae (Department of Chemistry, Pohang University of Science and Technology) ;
  • Choi, Hee-Cheul (Department of Chemistry, Pohang University of Science and Technology)
  • Published : 2007.11.20
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Abstract

A successful combination of “oxygen-assisted chemical vapor deposition (CVD) process” and Co catalyst nanoparticles to grow highly pure single walled carbon nanotubes (SWNTs) was demonstrated. Recently, it was reported that addition of small amounts of oxygen during CVD process dramatically increased the purity and yield of carbon nanotubes. However, this strategy could not be applied for discrete Fe nanoparticle catalysts from which appropriate yields of SWNTs could be grown directly on solid substrates, and fabricated into field effect transistors (FETs) quite efficiently. The main reason for this failure is due to the carbothermal reduction which results in SiO2 nanotrench formation. We found that the oxygen-assisted CVD process could be successfully applied for the growth of highly pure SWNTs by switching the catalyst from Fe to Co nanoparticles. The topological morphologies and p-type transistor electrical transport properties of the grown SWNTs were examined by using atomic force microscope (AFM), Raman, and from FET devices fabricated by photolithography.

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