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(a) Simplified equivalent circuit model of the two neighboring electrodes in the interdigitated electrode pair. R refers to the resistance of the channel. Cox is the capacitance of the deposited oxide layer for each electrode-oxide-electrolyte interface, and Cpar is the parasitic capacitance. (b,c) Simulated voltage drop spectrum (b) and electric field spectrum (c) across the oxide capacitance at each electrode-buffer interface for various oxide thicknesses.
