Development and Characterization of 3D Electronic Printed Gold Nanoparticle-based Sensing Electrodes with Potential for Environmental and Biomedical Applications

Electrochemical impedance spectroscopy (EIS), one of the techniques for electrochemical analysis, has been used for a wide range of applications especially chemical- and bio-sensing. Here, we present a methodology for the fabrication of gold nanoparticle-based flexible EIS electrodes that can be used for environmental and biomedical applications. These sensing electrodes are fabricated by processing functional nanoparticle ink via an advanced 3D electronic printer known as the aerosol jet printer which can achieve high resolution and compatible with a wide range of substrates. In this work, we investigated printing both gold nanoparticle ink and polyimide dielectric ink to realize a fully printed EIS sensing electrodes. Besides, we looked into utilizing a surface treatment for improving film adhesion to the substrate and conducted various tests to evaluate the reliability and the performance of the printed gold electrodes.