Wearable electronic sensor for potentiometric and amperometric measurements

To enable continuous monitoring of electrochemical sensors outside the laboratories, there is a significant demand on electrochemical measurement systems to be miniaturized. The paper presents a low-cost, portable miniature device for electrochemical measurements. The device consists of a 35mm × 20mm × 25mm wireless tag, which enables potentiometric and amperometric measurement, and a base station for data acquisition. Potentiometric performance is evaluated using solid contact ion selective electrodes for pH and sodium. High sensitivity, repeatability and fast response time have been achieved. Amperometric measurement of hydrogen peroxide shows that the measured current accuracy and sensitivity are comparable to that of a commercial potentiostat. Moreover, the device can be used for lactate concentration sensing.