Fernandes Iara J, Aroche Angélica F, Schuck Ariadna, Lamberty Paola, Peter Celso R, Hasenkamp Willyan, Rocha Tatiana L A C
itt Chip - Institute of Technology on Semiconductors, Universidade do Vale do Rio dos Sinos, São Leopoldo, 93022-750, Brazil.
Sci Rep. 2020 Jun 1;10(1):8878. doi: 10.1038/s41598-020-65698-3.
Flexible electronics can be developed with a low-cost and simple fabrication process while being environmentally friendly. Conductive silver inks have been the most applied material in flexible substrates. 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. Silver nanoparticles synthesis was carried out through chemical reduction of silver nitrate; then, seven conductive ink formulations were produced. Properties such as resistivity, viscosity, surface tension, adhesion, inkjet printability of the inks, and electrical impedance of the printed electrodes were investigated. Curing temperature directly influenced the electrical properties of the inks. The resistivity obtained varied from 3.3 × 10 to 5.6 × 10 Ω.cm. Viscosity ranged from 3.7 to 7.4 mPa.s, which is suitable for inkjet printing fabrication. 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.
柔性电子器件可以通过低成本且简单的制造工艺来开发，同时还具有环保特性。导电银墨水一直是柔性基板中应用最为广泛的材料。本研究通过研究材料特性、喷墨印刷工艺以及基于使用缓冲溶液的电阻抗光谱法的应用，评估了使用银纳米颗粒的不同导电墨水配方的性能。银纳米颗粒的合成是通过硝酸银的化学还原进行的；然后，制备了七种导电墨水配方。研究了墨水的电阻率、粘度、表面张力、附着力、喷墨可印刷性以及印刷电极的电阻抗等性能。固化温度直接影响墨水的电学性能。所获得的电阻率在3.3×10至5.6×10Ω·cm之间变化。粘度范围为3.7至7.4 mPa·s，这适合于喷墨印刷制造。通过使用缓冲溶液作为分析物，对于所有提出的设计，印刷电极对的电阻抗均低于200Ω，这表明所配制的墨水在用于生物传感应用的柔性电子器件中的应用潜力。
