Ji Seok Young, Kim Hoon-Young, Cho Sung-Hak, Chang Won Seok
Department of Nano Mechanics, Nanomechanical Systems Research Division, Korea Institute of Machinery and Materials, 156 Gajeongbuk-Ro, Yuseong-Gu, Daejeon 34103, Korea.
Department of Nano-Mechatronics, Korea University of Science and Technology (UST), 217 Gajeong-Ro, Yuseong-Gu, Daejeon 34113, Korea.
Materials (Basel). 2019 Nov 20;12(23):3809. doi: 10.3390/ma12233809.
The development of ink-based printing techniques has enabled the fabrication of electric circuits on flexible substrates. Previous studies have shown that the process method which uses a silver (Ag) precursor (AgCFCOO) and electrospun poly(styrene-block-butadiene-block-styrene) (SBS) can yield patterns with high conductivity and stretchability. However, the only method to reduce the Ag precursor absorbed in SBS is chemical reduction using a toxic solution. Here, we developed a process to fabricate a high-conductivity pattern via laser reduction by photo-chemical reaction without toxic solutions. The Ag precursor was absorbed in electrospun SBS to form a composite layer (composite SBS) with modified properties, that could more effectively absorb the photon energy than SBS without the Ag precursor. We analyzed the properties of this material, such as its light absorption coefficient, heat conductivity, and the density of both SBS and composite SBS to allow comparison of the two materials by numerical simulation. In addition, we fabricated patterns on highly heat-sensitive substrates such as burning paper and a polyethylene terephthalate (PET) thin film, as the pattern can be implemented using very low laser energy. We expect the proposed approach to become a key technology for implementing user-designed circuits for wearable sensors and devices on various flexible substrates.
基于墨水的印刷技术的发展使得在柔性基板上制造电路成为可能。先前的研究表明，使用银（Ag）前驱体（AgCFCOO）和电纺聚（苯乙烯-嵌段-丁二烯-嵌段-苯乙烯）（SBS）的工艺方法可以产生具有高导电性和可拉伸性的图案。然而，减少SBS中吸收的Ag前驱体的唯一方法是使用有毒溶液进行化学还原。在此，我们开发了一种通过光化学反应进行激光还原而无需使用有毒溶液来制造高导电性图案的工艺。Ag前驱体被吸收到电纺SBS中，形成具有改性性能的复合层（复合SBS），与不含Ag前驱体的SBS相比，其能够更有效地吸收光子能量。我们分析了这种材料的特性，如光吸收系数、热导率以及SBS和复合SBS的密度，以便通过数值模拟对这两种材料进行比较。此外，我们在高度热敏的基板上制造图案，如燃烧的纸张和聚对苯二甲酸乙二醇酯（PET）薄膜，因为可以使用非常低的激光能量来实现图案。我们期望所提出的方法成为在各种柔性基板上为可穿戴传感器和设备实现用户设计电路的关键技术。
