Department of Electronics Design, Mid Sweden University, SE-851 70 Sundsvall, Sweden.
Nanotechnology. 2013 Nov 15;24(45):455203. doi: 10.1088/0957-4484/24/45/455203. Epub 2013 Oct 15.
The resistance of inkjet printed lines using a silver nanoparticle based ink can be very dependent on the substrate. A very large difference in resistivity was observed for tracks printed on paper substrates with aluminum oxide based coatings compared to silica based coatings. Silica based coatings are often cationized with polymers using chloride as a counter ion. It is suggested that the precipitation of silver salts is the cause of the high resistivity, since papers pretreated with salt solutions containing ions that precipitate silver salts gave a high resistance. Silver nitrate has a high solubility and paper pretreated with nitrate ions gave a low resistivity without sintering. The results obtained show that, by choosing the correct type of paper substrate, it is possible to manufacture printed structures, such as interconnects on paper, without the need for, or at least to reduce the need for, post-print sintering. This phenomenon is, of course, ink specific. Inks without or with a low silver ion content are not expected to behave in this manner. In some sensor applications, a high resistivity is desired and, by using the correct combination of ink and paper, these types of sensors can be facilitated.
喷墨打印线条的电阻取决于基底。使用基于银纳米粒子的墨水打印的线条在具有氧化铝基涂层的纸基底上与具有二氧化硅基涂层的基底相比，其电阻率有很大差异。二氧化硅基涂层通常使用聚合物进行阳离子化，使用氯离子作为抗衡离子。据推测，银盐的沉淀是高电阻率的原因，因为用含有沉淀银盐的离子的盐溶液预处理的纸张表现出高电阻。硝酸银具有很高的溶解度，用硝酸盐预处理的纸张在不烧结的情况下电阻很低。所得结果表明，通过选择正确类型的纸基底，可以在无需（或至少减少）打印后烧结的情况下制造印刷结构，例如纸上的互连。这种现象当然是特定于墨水的。不含或含银离子含量低的墨水预计不会以这种方式表现。在一些传感器应用中，需要高电阻，并且通过使用正确的墨水和纸张组合，可以实现这些类型的传感器。
