Development of a portable potentiostat with wireless communications for measuring dissolved oxygen

- In this paper, we describe a portable potentiostat which is capable of cyclic voltammetry(CV) and amperometry for electrochemical dissolved oxygen sensor. In addition, this portable potentiostat can also transmit the measured data wirelessly to android devices such as smart phone, tablet, etc. through Bluetooth. The potentiostat system consists of three parts; a voltage generator circuit which is controlled by Arduino nano and 12-bit DAC(digital to analog converter) to generate necessary electric potential for operating the electrochemical sensor, an oxidation/reduction current measurement circuit, and a Bluetooth module to transmit data wirelessly to an android device. Once measurements are carried out with the android application, the measured data is transmitted to the android device via Bluetooth and displayed using the android app. in real time. In this paper, we report the measured reduction current with a fabricated dissolved oxygen sensor in both saturated-oxygen state and zero-oxygen states. The results of the developed portable potentiostat system are in good agreement with those of the commercial portable potentiostat (μstat200, Dropsens inc.). The measured peak reduction currents using the developed potentiostat and the commercial μstat200 potentiostat were –0.755 μA and –0.724 μA, respectively. The reduction currents measured at zero-oxygen state were –0.005 μA and –0.004 μA. The discrepancy between those two systems seems very small, which implies successful development of a portable and wireless potentionstat.