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Controlled dielectrophoretic assembly of carbon nanotubes using real-time electrical detection

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7 Author(s)
Sorgenfrei, S. ; Department of Electrical Engineering, Columbia University, New York, New York 10027, USA ; Meric, I. ; Banerjee, Sarbajit ; Akey, Austin
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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.

Published in:

Applied Physics Letters  (Volume:94 ,  Issue: 5 )

Date of Publication:

Feb 2009

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