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. 2017 Feb 27;7:43432. doi: 10.1038/srep43432

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(a) Device capacitance (at 20 Hz) as a function of the water/EtOH concentration for different oxide thicknesses. (b) Capacitance as a function of frequency for different EtOH/water concentrations using a 15 nm-thick Al₂O₃-coated electrode. (c) The device equivalent circuit. The indexes ox, dl and sol correspond, respectively, to the capacitive and resistive contributions of the oxide, the electrical double layer and the solution bulk to measured impedance.