A simple fabrication process for disposable interdigitated electrode arrays with nanogaps for lab-on-a-chip applications

The electrical performances of silicon dioxide-based Interdigitated electrodes (IDEs) as biosensor were developed. The IDEs was made up by two individually addressable Interdigitated comb-like finger structure have frequently been suggested as a biosensor which promises higher sensitivity compared to conventional parallel electrodes. The purpose of this paper was to investigate the capacitance test and impedance test to taken with various pH solution to observe the response of the sensor with different pH values. Purchased pH buffer solutions which varied from pH2 to pH10 are dropped on the microelectrode and the effect on it is investigated for the application in pH measurement. This research has proven that increase in pH value from acidic to alkaline is proportional with capacitance. The measured values of capacitance with respect to each pH concentrations applied during the measurements were repeatable and reproducible.

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Interdigitated electrode arrays made by capillary filling and spin coating for UV-sensor fabrication

Flexible and Printed Electronics ◽

10.1088/2058-8585/ab3777 ◽

2019 ◽

Vol 4 (3) ◽

pp. 035002

Author(s):

Barbara Horváth ◽

Ethouba Al Jassin-Al-Hashemi ◽

Helmut Schift

Keyword(s):

Spin Coating ◽

Electrode Arrays ◽

Interdigitated Electrode ◽

Uv Sensor ◽

Capillary Filling ◽

Sensor Fabrication

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Dielectrophoretic Microfluidic Switching for Lab on a Chip Applications

MRS Proceedings ◽

10.1557/proc-1004-p08-04 ◽

2007 ◽

Vol 1004 ◽

Author(s):

Lisen Wang ◽

Abraham Philip Lee

Keyword(s):

Optimal Design ◽

Equilibrium Points ◽

Side Wall ◽

Lab On A Chip ◽

Stream Channel ◽

Electrode Arrays ◽

Electrical Field ◽

Proposed Model ◽

Width Direction ◽

Side Walls

AbstractDielectrophoresis switching with vertical microelectrodes in the side wall of microchannel have been designed, fabricated and tested. A set of interdigitated electrodes in the side wall of the microchannels is used for the generation of non-uniform electrical field to introduce DEP force to repel or attract beads/cells to the sidewalls. A countering DEP force is generated from another set of electrodes patterning on the opposing side walls. These DEP forces can be adjusted by the voltage and frequency applied. By manipulating the coupled DEP forces, the particles flowing through the microchannel can be positioned at different equilibrium points along the width direction and continue to flow into different outlets. The objects of interest can be switched to desired channel outlets in the flow with no need of any moving parts and the down-stream channel can be more than three outlets. Experimental results for switching cells to two outlets and polystyrene microbeads to five outlets have been achieved. The effect of the geometry and flow rate on the performance of the switching was studied and an analytical solution for the optimal design and operation of DEP electrode arrays has been derived from the proposed model.

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