Investigation of parameters controlling the dielectrophoretic assembly of carbon nanotubes on microelectrodes

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    Abstract

    Networks of single-walled carbon nanotubes were assembled onto microelectrodes by dielectrophoresis. The dependence of the obtained networks on several assembly parameters such as bias voltage, field application time, frequency, electrode geometry and the nanotube solvent were investigated both structurally and electrically. Reproducible differences in morphological and electrical properties were observed for the parameters investigated. Application of a bias voltage above 10 V for more than 30 seconds with nanotubes in an SDS solution, resulted in dense networks with a relatively low resistance in the 10 k Omega regime. On the other hand, individual nanotubes and bundles were assembled with lower voltages applied for less than 10 seconds and with other nanotubes solutions. The experimental results were combined with theoretical calculations in order to find a geometry and voltage independent threshold field for the successful assembly of nanotubes between electrodes using dielectrophoresis.
    Original languageEnglish
    JournalJournal of Nanoscience and Nanotechnology
    Volume8
    Issue number4
    Pages (from-to)1973-1978
    ISSN1533-4880
    DOIs
    Publication statusPublished - 2008

    Keywords

    • dielectrophoresis
    • carbon nanotubes
    • microelectrodes
    • process control

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