Controlled dielectrophoretic assembly of carbon nanotubes using real-time electrical detection
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We investigate dielectrophoretic deposition of single-walled carbon nanotubes using an in situ detection system. Pairs of electrodes are stimulated with a small-amplitude, low-frequency voltage superimposed on a large-amplitude, high-frequency dielectrophoretic voltage. Measuring the magnitude of the current both at dc (Idc) and at the low frequency (Iac) through a digital lock-in technique allows us to determine when a nanotube has made electrical contact and to halt the dielectrophoretic process. Because Idc is determined by nonlinearities in the device current-voltage characteristic, measurement of the Idc / Iac ratio allows the real-time determination of whether the deposited nanotube is metallic or semiconducting. © 2009 American Institute of Physics.
author list (cited authors)
Sorgenfrei, S., Meric, I., Banerjee, S., Akey, A., Rosenblatt, S., Herman, I. P., & Shepard, K. L.