In this article nickel interdigital capacitors were fabricated on top of silicon substrates. The capacitance of the interdigital capacitor was optimized by coating the electrodes with a 60 nm layer of HfO2. An analytical solution of the capacitance was compared to electromagnetic simulations using COMSOL and with experimental measurements. https://www.bekindtopets.com/limited-value-Microline-S1229RS-TFC-RO-Membrane-35-50-gpd-mega-choice/