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Korean Carbon Society (한국탄소학회)
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Dielectrophoretic Alignment and Pearl Chain Formation of Single-Walled Carbon Nanotubes in Deuterium Oxide Solution

  • Lee, Dong Su (Institute of Advanced Composite Materials, Korea Institute of Science and Technology) ;
  • Park, Yung Woo (Department of Physics and Astronomy, Seoul National University)
  • Received : 2012.08.01
  • Accepted : 2012.09.25
  • Published : 2012.10.31
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Abstract

Dielectrophoretic filtering and alignment of single-walled carbon nanotubes (SWCNTs) were tested using deuterium oxide as a solvent. A solution of deuterium oxide-SWCNTs was dropped on top of a silicon chip and an ac electric field was applied between pre-defined electrodes. Deuterium oxide was found to be a better solvent than hydrogen oxide for the dielectrophoresis process with higher efficiency of filtering. This was demonstrated by comparing Raman spectra measured on the initial solution with those measured on the filtered solution. We found that the aligned nanotubes along the electric field were not deposited on the substrate but suspended in solution, forming chain-like structures along the field lines. This so-called pearl chain formation of CNTs was verified by electrical measurements through the aligned tubes. The solution was frozen in liquid nitrogen prior to the electrical measurements to maintain the chain formation. The current-voltage characteristics for the sample demonstrate the existence of conduction channels in the solution, which are associated with the SWCNT chain structures.

Keywords

Acknowledgement

Supported by : Korea Institute of Science and Technology (KIST)

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