Department of Mechanical Engineering, Sungkyunkwan University , Suwon, 440-746, Republic of Korea.
Coastal & Environmental Engineering Division, Korea Institute of Ocean Science and Technology (KIOST) , Ansan 15627, Gyeonggi, Republic of Korea.
ACS Appl Mater Interfaces. 2017 Sep 6;9(35):29965-29972. doi: 10.1021/acsami.7b08375. Epub 2017 Aug 24.
A one-step sub-micrometer-scale electrohydrodynamic (EHD) inkjet three-dimensional (3D)-printing technique that is based on the drop-on-demand (DOD) operation for which an additional postsintering process is not required is proposed. Both the numerical simulation and the experimental observations proved that nanoscale Joule heating occurs at the interface between the charged silver nanoparticles (Ag-NPs) because of the high electrical contact resistance during the printing process; this is the reason why an additional postsintering process is not required. Sub-micrometer-scale 3D structures were printed with an above-35 aspect ratio via the use of the proposed printing technique; furthermore, it is evident that the designed 3D structures such as a bridge-like shape can be printed with the use of the proposed printing technique, allowing for the cost-effective fabrication of a 3D touch sensor and an ultrasensitive air flow-rate sensor. It is believed that the proposed one-step printing technique may replace the conventional 3D conductive-structure printing techniques for which a postsintering process is used because of its economic efficiency.
提出了一种基于按需滴墨（DOD）操作的一步式亚微米级电动力学（EHD）喷墨三维（3D）打印技术，无需额外的后烧结工艺。数值模拟和实验观察都证明，在打印过程中，由于高的电接触电阻，在带电的银纳米颗粒（Ag-NPs）之间会发生纳米级焦耳加热，这就是不需要额外后烧结工艺的原因。通过使用所提出的打印技术，可以打印出具有 35 以上纵横比的亚微米级 3D 结构；此外，显然可以使用所提出的打印技术打印出设计的 3D 结构，例如桥形结构，从而可以经济高效地制造 3D 触摸传感器和超灵敏气流速率传感器。相信所提出的一步式打印技术可能会取代传统的 3D 导电结构打印技术，因为后者需要进行后烧结工艺，而这种新技术具有经济效益。
