Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan.
ACS Appl Mater Interfaces. 2012 Apr;4(4):2168-73. doi: 10.1021/am300160s. Epub 2012 Apr 4.
Polyimide films are the most promising substrates for use in printed electronics because of their high thermal stability. However, the high wettability of polyimide films by conductive inks often produces thin inkjet-printed lines with splashed and wavy boundaries, resulting in high electrical resistance of the lines. To overcome these disadvantages, we fabricated repellent pore structures composed of polyamideimide with high thermal stability on a polyimide film. Using this film, the inkjet-printed line thickness was increased without penetration of silver nanoparticles into the pore structures, thus resulting in very sharp edges without any splashing. This was because the repellent treatment restricted the spreading of the silver nanoparticles into the pore structures and the pore structures prevented ink splashing upon impact on the film. As a result, the electrical resistance of these lines decreased to one-fifth that of the lines on the pristine polyimide film. The inkjet printing of conductive inks onto repellent pore structures would contribute to the future of printed electronics because this technique enables printing closely packed line patterns while maintaining high conductivity within a limited space.
聚酰亚胺薄膜由于其高热稳定性，是用于印刷电子的最有前途的基底。然而，聚酰亚胺薄膜对导电油墨的高润湿性常常导致喷墨打印的线条具有飞溅和波浪状的边界，从而导致线条的电阻很高。为了克服这些缺点，我们在聚酰亚胺薄膜上制造了由高热稳定性的聚酰胺酰亚胺组成的斥油孔结构。使用这种薄膜，喷墨打印的线条厚度增加，而没有银纳米粒子渗透到孔结构中，因此边缘非常锐利，没有任何飞溅。这是因为斥油处理限制了银纳米粒子在孔结构中的扩散，而孔结构阻止了油墨在撞击薄膜时飞溅。结果，这些线条的电阻降低到原始聚酰亚胺薄膜上的线条的五分之一。将导电油墨喷墨打印到斥油孔结构上，将有助于印刷电子的未来，因为这种技术可以在有限的空间内保持高导电性的同时，实现紧密排列的线条图案的打印。
