以离子交换法合成的草酸银前驱体为银源，乙二胺为络合剂，异丙醇为溶剂制备了 MOD无颗粒银导电墨水。将该墨水喷墨打印于聚萘二甲酸乙二醇酯(PEN)柔性基板，并在加热板上150℃固化20 min，并通过DSC、FE-SEM、激光共聚焦、四探针测电阻率方法对合成的墨水进行表征。结果表明导电墨水的温度远低于银前驱体的分解温度；喷墨打印多层的银线在基板上表现出不同宽度、厚度和电阻率。其中，打印10层的银线电阻率可达3.22μ?·cm，接近块状纯银电阻率(1.65μ?·cm)。喷墨打印后的银图案表面平整光滑且微观组织致密，在柔性印刷方向有良好的应用前景。
MOD (Metal Organic Decomposition) particle free silver conductive ink was prepared by using silver oxalate powder synthesized by ion exchange method, ethylenediamine as a complex ligand and isopropanol as the solvent. The ink was inkjet printed on PEN substrate and cured at 150oC for 20 min by heating on a hot plate. The synthesized powder and conductive ink were analyzed by DSC, FE-SEM, confocal laser scanning microscopy and four-point probe system. The temperature of decomposition of silver conductive ink is much lower than that of silver oxalate powder. The silver lines which inkjet printed on PEN substrate for different layers showed various line width, line thickness and resistivity. Among them, the 10-layer silver line showed the lowest resistivity of 3.22 μ?·cm, almost approaching the theoretical value of bulk silver (1.65 μ?·cm). The inkjet printed silver patterns showed smooth surface and quite dense microstructure, which has good application prospect in flexible electronic industry.
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