Simulation Research on Interdigitated Electrodes based sensors in water solution monitoring

Interdigitated electrodes (IDEs) based sensors have the advantages of being rapid and accurate in the electrochemical detection area. In this paper, simulation research on IDEs-based impedance sensors in water solution is performed, and the electric field distribution under different sizes (pairs, finger width, and finger spacing) is compared, while the corresponding impedance in water solution is calculated. As a result, the optimal size of the IDEs (pairs=10, spacing =0.1 mm, width=0.5 mm) is chosen, and impedance changes in a water solution with different conductivities are investigated. This work provides a good theoretical reference for the actual sensor design.