This fabrication technique deposits particles of the material with desirable electrical properties onto a substrate, after which, the printed pattern is converted into conductive elements 1. Inkjet printing has been investigated as an alternative production tool for the fabrication of conductive elements and devices in the field of flexible electronics. By using a buffer solution as an analyte, the printed electrode pairs presented electrical impedance lower than 200 Ω for all the proposed designs, demonstrating the potential of the formulated inks for utilization in flexible electronic devices for biological sensing applications. Viscosity ranged from 3.7 to 7.4 mPa.s, which is suitable for inkjet printing fabrication. Curing temperature directly influenced the electrical properties of the inks. Properties such as resistivity, viscosity, surface tension, adhesion, inkjet printability of the inks, and electrical impedance of the printed electrodes were investigated. Silver nanoparticles synthesis was carried out through chemical reduction of silver nitrate then, seven conductive ink formulations were produced. This study evaluated the performance of different conductive ink formulations using silver nanoparticles by studying the material properties, the inkjet printing process, and application based on electrical impedance spectroscopy using a buffer solution. Conductive silver inks have been the most applied material in flexible substrates. Flexible electronics can be developed with a low-cost and simple fabrication process while being environmentally friendly.
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