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http://dx.doi.org/10.3795/KSME-A.2006.30.2.179

Surface Conductance Modulation of Single-Walled Carbon Nanotubes and Effects on Dielectrophoresis  

Hong Seung-hyun (성균관대학교 기계공학부)
Jung Se-hun (성균관대학교 기계공학부)
Kim Young-jin (성균관대학교 기계공학부)
Choi Jae-bong (성균관대학교 기계공학부)
Baik Seunghyun (성균관대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.30, no.2, 2006 , pp. 179-186 More about this Journal
Abstract
Dielectrophoresis has received considerable attention for separating nanotubes according to electronic types. Here we examine the effects of surface conductivity of semiconducting single-walled carbon nanotubes (SWNT), induced by ionic surfactants, on the sign of dielectrophoretic force. The crossover frequency of semiconducting SWNT increases rapidly as the conductivity ratio between the particle and medium increases, leading to an incomplete separation of ionic surfactant suspended SWNT at an electric field frequency of 10 MHz. The surface charge of SWNT is neutralized by an equimolar mixture of anionic surfactant sodium dodecyl sulfate (SDS) and cationic surfactant cetyltrimenthylammonium bromide (CTAB), resulting in negative dielectrophoresis of semiconducting species at 10 MHz. A comparative Raman spectroscopy study shows a nearly complete separation of metallic SWNT.
Keywords
Single-Walled Carbon Nanotubes; Dielectrophoresis; Surface Conductance; Catanionic Surfactant;
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