Serpelloni Mauro, Cantù Edoardo, Borghetti Michela, Sardini Emilio
Department of Information Engineering, University of Brescia, Via Branze 38, 25123 Brescia, Italy.
Sensors (Basel). 2020 Feb 4;20(3):841. doi: 10.3390/s20030841.
Printed electronics is an expanding research field that can reach the goal of reducing the environmental impact on electronics exploiting renewable and biodegradable materials, like paper. In our work, we designed and tested a new method for fabricating hybrid smart devices on cellulose substrates by aerosol jet printing (AJP) and photonic curing, also known as flash lamp annealing (FLA), capable to cure low temperature materials without any damage. Three different cellulose-based materials (chromatographic paper, photopaper, cardboard) were tested. Multilayer capability and SMDs (surface mount devices) interconnections are possible permitting high flexibility in the fabrication process. Electrical and geometrical tests were performed to analyze the behavior of printed samples. Resulted resistivities are 26.3 × 10 m on chromatographic paper, 22.3 × 10 m on photopaper and 13.1 × 10 m on cardboard. Profilometer and optical microscope evaluations were performed to state deposition quality and penetration of the ink in cellulose materials (thicknesses equal to 24.9, 28.5, and 51 μm respectively for chromatographic paper, photopaper, and cardboard). Furthermore, bending (only chromatographic paper did not reach the break-up) and damp environment tests (no significant variations in resistance) where performed. A final prototype of a complete functioning multilayer smart devices on cellulose 3D-substrate is shown, characterized by multilayers, capacitive sensors, SMDs interconnections.
印刷电子学是一个不断发展的研究领域，它可以通过利用可再生和可生物降解的材料（如纸张）来实现减少电子产品对环境影响的目标。在我们的工作中，我们设计并测试了一种通过气溶胶喷射印刷（AJP）和光子固化（也称为闪光灯退火，FLA）在纤维素基板上制造混合智能设备的新方法，该方法能够在不造成任何损坏的情况下固化低温材料。测试了三种不同的纤维素基材料（色谱纸、相纸、纸板）。多层制造能力和表面贴装器件（SMD）互连成为可能，这使得制造过程具有高度的灵活性。进行了电气和几何测试以分析印刷样品的性能。色谱纸上的电阻率为26.3×10Ω·m，相纸上为22.3×10Ω·m，纸板上为13.1×10Ω·m。使用轮廓仪和光学显微镜进行评估，以确定墨水在纤维素材料中的沉积质量和渗透情况（色谱纸、相纸和纸板的厚度分别为24.9、28.5和51μm）。此外，还进行了弯曲测试（只有色谱纸未达到破裂点）和潮湿环境测试（电阻无显著变化）。展示了一个在纤维素3D基板上完整功能的多层智能设备的最终原型，其特点是具有多层结构、电容式传感器和SMD互连。
