Ag dot morphologies printed using electrohydrodynamic (EHD) jet printing based on a drop-on-demand (DOD) operation

Abstract

Electrohydrodynamic (EHD) jet printing technology is an attractive method for micro-scale electronic device fabrication. The primary advantage of EHD jet printing compared with conventional inkjet printing is the capability to print at resolutions below 10 µm and to eject high-viscosity ink. In this study, by using drop-on-demand (DOD) jetting, we printed silver (Ag) dots onto a silicon (Si)-wafer and evaluated the dot uniformity. Furthermore, we investigated the effects of substrate surface energy and substrate temperature on the dot morphology. We also investigated the effects of overprinting on the dot morphologies. Our results show that we successfully created uniform dot patterns under 10 µm by using EHD jet printing. In addition the dot diameter approached 14 µm while the substrate was heated up to 40 °C. We also found that on the hydrophobic Si-wafer, increasing the substrate temperature and the number of overprinting could be used as an alternative method for increasing the aspect ratio of dot and suppressing the coffee-stain effect.

Printing Conductive Nanomaterials for Flexible and Stretchable Electronics: A Review of Materials, Processes, and Applications

“…In a unique, extremely high RF application, terahertz metamaterials were made using EHD printing of AgNP inks on polyimide substrate . The I‐shaped Ag electrodes with 10 µm linewidth and 5 µm gap exhibited a refractive index as high as 18.4 at a frequency of 0.48 THz.…”

Mechanisms, Capabilities, and Applications of High‐Resolution Electrohydrodynamic Jet Printing

“…Byun and coworkers performed a detailed study of the uniformity of e-jet printed silver dots and explored the effects of surface energy and temperature of the substrate. [ 166 ] Using a commercially available silver nanoparticle ink in butyl-carbitol and a nozzle with an inner diameter of 6 µm, the authors generated silver dots with diameters between 7 µm and 20 µm. As shown in Figure 10 a, the process allows for generation of uniform arrays of Ag dots with diameters less than 10 µm.…”

“…Reproduced with permission. [ 166 ] Copyright 2013, IOP Publishing. b) The width of the line as a function of the diameter of the droplets.…”

Micro-and nanoscale 3D printing

“…喷墨打印有两种供墨打印方式: 连续喷墨打印 和按需喷墨打印(drop-on-demand, DOD). 通过采用 脉冲直流电压, 并结合优化的工艺参数(如低偏置电 压、 脉冲宽度、 脉冲峰值电压等), 实现按需喷墨打印, 为了进一步提高打印图形的一致性, Prasetyo 等人 [59] 系统研究了基于 DOD 电喷印制造金属银点状结构, 图 13 传统 3D 打印制造支架与电喷印制造支架 [60] 图 14 电喷印打印的功能性蛋白质微阵列 [61] 好、定位精度高的特点, 而且能够兼容多种生物材料 和衬底, 实现多种微纳图形的制造. 实验结果展示电 喷印在生物技术和医疗等领域具有良好的应用前景 和巨大的潜能 [61] .…”