Numerical Investigation of a Microfluidic Biosensor Based on I-Shaped Micropillar Array Electrodes.

Area of Science:

• Electrochemistry
• Biosensor Technology
• Microfluidics

Background:

• Micropillar array electrodes enhance electrochemical biosensor performance through improved mass transport and miniaturization.
• Electrode geometry, including shape and height, significantly impacts biosensor sensitivity and detection limits.

Purpose of the Study:

• To design and model a microfluidic electrochemical biosensor with micropillar array electrodes.
• To compare the electrochemical response of I-shaped versus cylindrical micropillar array electrodes.

Main Methods:

• Utilized COMSOL Multiphysics for modeling micropillar array electrodes.
• Employed cyclic voltammetry to measure response currents.
• Fabricated a working electrode with 100 micropillars, each 300 µm in height.

Main Results:

• The working electrode demonstrated a sensitivity of 1.61 µA·cm²·mM⁻¹ using cyclic voltammetry.
• Comparative analysis revealed differences in response currents between I-shaped and cylindrical electrode designs.

Conclusions:

• Micropillar array electrodes are crucial for developing advanced electrochemical biosensors.
• The studied electrode geometry, particularly the cylindrical design, shows promise for highly sensitive analyte detection in microfluidic systems.