Characterization of Screen-Printed Bioimpedance Electrodes on Nanocellulose Substrate

Screen printed dry electrodes show advantages over wet electrodes for many applications in human and plant biopotential measurements. Bacterial nanocellulose provides a robust, ultra-thin, water vapor permeable substrate upon which to fabricate the electrodes. Herein, we report on the characterization of screen-printed electrodes on bacterial nanocellulose films. Electrode impedance and surface area were characterized using electrochemical impedance spectroscopy, cyclic voltammetry, and chronoamperometry. Annealing temperature was evaluated for effects on electrode performance. Electrodes annealed at 80°C had a 25% higher impedance across frequencies in the range 0.01Hz to 100kHz and a 6-19% lower ratio of geometric surface area to electrochemically active surface area than electrodes annealed at 60°C.