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GENERATION OF DEP FORCE FOR
ASSEMBLY OF CNT-BASED NANO DEVICES
PROFESSOR: YI–CHU HSU
NAME: LE CONG THANH
STUDENT ID: MA01Y202
CONTENT
I.
Introduction
II. DEP force for CNTs Implementation
III. Experimental results
IV. Conclusions
I. INTRODUCTION
 Carbon nanotubes (CNTs) is very very tiny
cylinder Carbon. Carbon nanotubes are very
tough and hard to break, but still relatively light
 CNTs are known to be good candidates for many
electronics and sensing applications.
 Dielectrophoresis (DEP) is the ability of an
uncharged material to move when subjected to
an electric field.
 In this paper, we present dielectrophoresis
(DEP) is applied to carbon nanotubes on micro
electrode.
 We are able to give recommendations for the
optimization of CNTs for intelligent
manufacturing of CNT- based sensors.
II.DEP force for CNTs implementation
 Dielectrophoresis is the motion of a particle
produced by the interaction of nonuniform
electric field with induced effective dipole
moment p of particle.
 Depending on the polarizability of the particle
compared to that of the medium. The force
could push the particle towards high electric
field regions (+DEP), or low electric field
regions (- DEP).
 In this case of an alternating electric field, the
direction of the force and thus the direction of
motion will remain the same even upon field
reversal, because the dipole moment will be
inverted as well.
 Figure illustrates how different dielectric
particles polarize.
 The magnitude of polarizability and effective
dipole moment of the particle is frequency
dependent.
 On the basic of dielectrophoresis theory, to
model the DEP force distribution for
manipulating CNTs, we reasonably assumed
that CNTs from a particle by particle line
structure after undergoing AC electric field.
 The derived dielectrophoresis force for carbon
nanotubes depends on frequency, and
therefore on the permitivity and conductivity
of both the carbon nanotube particles and the
suspending medium, as well as the frequency
of the applied electric field.
III. Experimental result
The DEP experiment were conducted
under a micro robotic system at stable room
temperature as depicted Fig. To reduce the
vibrations from environment during the
experiment.
 The video shows the implementation of DEP
force for assembly of CNT-based devices. In the
video, the applied voltage to the micro
electrodes is 1.5V. The medium for which the
CNT particles are dispersed in is acetone. The
AC electric field (DEP) was applied to the
micro electrode for approximately 25 minutes.
The results from the video were consistent for
the given parameters.
IV. CONCLUSIONS
 In this paper, we presented implementation of
the carbon nanotubes (CNTs) using
dielectrophoresis (DEP).
 Futhermore, we will present modeling of
dielectrophoresis force for manipulating
carbon nanotubes.
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