NSTI Nanotech 2009

Vertical Alignment and Three-Dimensional Networks of Single-Walled Carbon Nanotubes

S.K. Kim, T.J. Lee, J. Seo, H. Lee, P.S. Weiss
Hanyang University, KR

Keywords: vertical alignment, three-dimensional, networks, carbon nanotubes


Our researches are focused on both the vertical alignment and the 3-D networking of SWCNTs. The vertical alignment of SWCNTs was performed on a gold electrode by DC electrophoretic deposition and ultrasonic irradiation. Applying ultrasonic energy resulted in dramatic changes of the film morphology; the deposited SWNT bundles reassembled and oriented normal to the electrode. We will also discuss the mechanism of SWNT orientation. The method for aligning SWNTs normal to the electrode may be competitive with chemical vapor deposition or screen printing, the predominant methods by which vertically aligned SWNT films have been fabricated to date. The 3-D networks of SWCNTs were fabricated by synthesizing SWCNTs on the 3-D structures of Si substrates. The hole or pillar structures were prepared by electrochemical etching or conventional deep etching processes of Si, respectively. By forming catalyst nanoparticles on the above Si substrates using a dipping method, the SWCNTs were uniformly synthesized with desired density on those 3-D structures of Si substrates. We expect that the 3-D networks of SWCNTs will be useful as highly efficient electrodes for the potential applications in the fields of future electronics and energy alternatives.
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