Controlled dielectrophoretic assembly of multiwalled carbon nanotubes

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The authors report on a real-time control method for assembly of a single or small number of multiwalled carbon nanotubes (MWNTs) onto microelectrodes by dielectrophoresis (DEP). On the basis of an impedance model and a real-time gap impedance monitoring method to evaluate and identify the number of MWNTs spanning an electrode gap, it has been demonstrated that a real-time gap impedance signal can be used to control the DEP process of MWNTs. The goal is controlled assembly with a connecting resistance of less than a defined limit or with a defined number of MWNT connections. With a control strategy designed for the DEP assembly of a small number of MWNTs, predefined numbers of connections from 1-3 have been achieved across an electrode gap. © 2009 American Chemical Society.

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Journal of Physical Chemistry C