Surface Modification of a Screen-printed Carbon Electrode with Iridium Oxide and Its Application of an Impedance Sensor

초록

In this study, we developed an impedance sensor capable of controlling electrode polarization by coating iridium oxide (IrOx) on the surface of the screen-printed carbon electrode. IrOx was deposited on the surface of carbon electrodes according to the number of cycles (0-50 cycles) by cyclic voltammetry. Observation of scanning electron microscope images revealed that the size and number of IrOx particles increased as the number of cycles increased. The changes in impedance responses as a function of the NaCl concentration of the as-obtained sensors were investigated using electrochemical impedance spectroscopy. The sensors manufactured in 50 cycles exhibited the best coefficient of determination and reproducibility, attributed to the well-controlled electrode polarization. We further demonstrated the usefulness of the IrOx-based sensor as a diagnosis sensor for dry eye syndrome by comparing the results of the commercially available osmometer and our sensor using actual solution samples.

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