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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