TITLE

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

AUTHOR(S)
Sorgenfrei, Sebastian; Meric, Inanc; Banerjee, Sarbajit; Akey, Austin; Rosenblatt, Sami; Herman, Irving P.; Shepard, Kenneth L.
PUB. DATE
February 2009
SOURCE
Applied Physics Letters;2/2/2009, Vol. 94 Issue 5, pN.PAG
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
36534219

 

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