Development of 3D silver electrodes for dielectrophoretic device
Date Issued
2011
Date
2011
Author(s)
Wei, Ting-You
Abstract
A high throughput micro-nano-particle separation device with 3D-electrodes was fabricated in this study.The 3D electrodes were fabricated to provide dielectrophoresis (DEP) force by using the combination of silver mirror reaction and microfluidic laminar flow patterning technique.Only one photomask was required during the fabrication process without additional vacuum-based metal deposition processs. Silver mirror reaction solutions were prepared and injected separately into a microchannel. The optimal deposition condition was tested and two parallel 3D electrodes were successfully formed at the liquid –liquid interfaces. Multi-walled carbon nanotubes (MWCNTs)were purified by DEP force according to the electrical characteristics. Raman spectroscopy, ratio, and current-voltage measurements were utilized to compare the purification performance between 3-D electrodes and plannar electrodes. From the experimental results, when we used 3D electrodes to pure MWCNTs, the ratio of conducting MWCNTs could be reduced to 0.71. It was lower than ratio of using planar electrodes. Moreover, current of conducting MWCNTs was increased by 3D electrodes. It shows that 3D electrodes could provide higher purification.
In this study, we have developed a simple and rapid method to deposit 3D electrodes. The advantages of 3D electrodes are the reduction of applied voltage and Joule heating due to high thickness. This work has been able to attain higher purification for such a lap-on-a-chip application.
Subjects
silver mirror reaction
3D electrodes
dielectrophoresis
carbon nanotubes
cell traps
Type
thesis
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