Zikulnig Johanna, Roshanghias Ali, Rauter Lukas, Hirschl Christina
Silicon Austria Labs GmbH, Inffeldgasse 33, 8010 Graz, Austria.
Sensors (Basel). 2020 Apr 23;20(8):2398. doi: 10.3390/s20082398.
With the growing significance of printed sensors on the electronics market, new demands on quality and reproducibility have arisen. While most printing processes on standard substrates (e.g., Polyethylene terephthalate (PET)) are well-defined, the printing on substrates with rather porous, fibrous and rough surfaces (e.g., uncoated paper) contains new challenges. Especially in the case of inkjet-printing and other deposition techniques that require low-viscous nanoparticle inks the solvents and deposition materials might be absorbed, inhibiting the formation of homogeneous conductive layers. As part of this work, the sheet resistance of sintered inkjet-printed conductive silver (Ag-) nanoparticle cross structures on two different, commercially available, uncoated paper substrates using Van-der-Pauw's method is evaluated. The results are compared to the conductivity of well-studied, white heat stabilised and treated PET foil. While the sheet resistance on PET substrate is highly reproducible and the variations are solely process-dependent, the sheet resistance on uncoated paper depends more on the substrate properties themselves. The results indicate that the achievable conductivity as well as the reproducibility decrease with increasing substrate porosity and fibrousness.
随着印刷传感器在电子市场上的重要性日益增加，对质量和可重复性提出了新的要求。虽然在标准基板（如聚对苯二甲酸乙二酯（PET））上的大多数印刷工艺都已明确，但在具有相当多孔、纤维状和粗糙表面的基板（如未涂层纸张）上进行印刷却带来了新的挑战。特别是在喷墨印刷和其他需要低粘度纳米颗粒墨水的沉积技术中，溶剂和沉积材料可能会被吸收，从而抑制均匀导电层的形成。作为这项工作的一部分，使用范德堡法评估了在两种不同的市售未涂层纸张基板上烧结喷墨印刷导电银（Ag-）纳米颗粒交叉结构的薄层电阻。将结果与经过充分研究的白色热稳定处理PET箔的电导率进行比较。虽然PET基板上的薄层电阻具有高度可重复性，且变化仅取决于工艺，但未涂层纸张上的薄层电阻更多地取决于基板本身的特性。结果表明，随着基板孔隙率和纤维度的增加，可实现的电导率以及可重复性会降低。
