Development of a printed impedance based electrochemical sensor on paper substrate

A novel printed impedance based electrochemical sensor has been successfully developed on a paper substrate for the detection of various bio/chemicals. This flexible analytical device was fabricated by screen printing a two electrode sensor configuration on a wax-printed chromatography paper substrate. Silver (Ag) ink was used for screen printing the working and circular electrodes. The capability of the fabricated electrochemical sensor for detecting trace concentrations of bio/chemicals such potassium chloride (KCl) and glucose (C6H12O6) was investigated. The electrical impedance spectroscopy (EIS) based response of the printed sensor revealed detection levels as low as picomolar (pM) concentrations as well as the capability of the sensor to distinguish among varying levels (pico, nano, micro and milli) of sample concentrations. The response of the developed electrochemical sensor has been analyzed and is presented in this paper.