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Applied Physics A

, Volume 80, Issue 1, pp 5-8

First online:

Extraction of semiconducting CNTs by repeated dielectrophoretic filtering

  • D.S. LeeAffiliated withSchool of Physics and Nano Systems Institute - National Core Research Center, Seoul National University
  • , D.W. KimAffiliated withSchool of Physics and Nano Systems Institute - National Core Research Center, Seoul National University
  • , H.S. KimAffiliated withSchool of Physics and Nano Systems Institute - National Core Research Center, Seoul National University
  • , S.W. LeeAffiliated withSchool of Physics and Nano Systems Institute - National Core Research Center, Seoul National University
  • , S.H. JhangAffiliated withSchool of Physics and Nano Systems Institute - National Core Research Center, Seoul National University
  • , Y.W. ParkAffiliated withSchool of Physics and Nano Systems Institute - National Core Research Center, Seoul National University
  • , E.E.B. CampbellAffiliated withDepartment of Experimental Physics, Göteborg University and Chalmers University of Technology Email author 

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Abstract

We have separated semiconducting carbon nanotubes from as-grown batch material (HiPco production). A special configuration of electrodes which generates a 3-dimensional electric field gradient was used to filter out and deposit metallic carbon nanotubes by the dielectrophoretic method, leaving the remaining dispersion enriched in semiconducting nanotubes. The efficiency of filtering was determined by Raman spectroscopy. Using repeated deposition cycles, the ratio of semiconducting to metallic tubes was increased. After seven cycles, the proportion of semiconducting tubes in the remaining dispersion reached 94%.