• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2009.06a
• /
• pp.885-886
• /
• 2009

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2009.06a
• /
• pp.337-338
• /
• 2009

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2007.06a
• /
• pp.761-762
• /
• 2007

• Proceedings of the Korean Society of Laser Processing Conference
• /
• 2005.06a
• /
• pp.66-69
• /
• 2005

• Proceedings of the Korean Society of Laser Processing Conference
• /
• 2005.11a
• /
• pp.105-108
• /
• 2005

• Proceedings of the Korean Society of Laser Processing Conference
• /
• 2005.11a
• /
• pp.101-104
• /
• 2005

• Proceedings of the Korean Society of Laser Processing Conference
• /
• 2006.11a
• /
• pp.25-30
• /
• 2006

• Proceedings of the Korean Vacuum Society Conference
• /
• 2002.06a
• /
• pp.74-74
• /
• 2002

• Macromolecular Research
• /
• v.17 no.3
• /
• pp.197-202
• /
• 2009

Solution-based, direct-write patterning by an automated, computer-controlled, inkjet technique is of particular interest in a wide variety of industrial fields. We report the construction of three-dimensional (3D), micro-patterned structures by polymer inkjet printing. A piezoelectric, drop-on-demand (DOD) inkjet printing system and a common polymer, PVA (poly(vinyl alcohol)), were explored for 3D construction. After a systematic preliminary study with different solvent systems, a mixture of water and DMSO was chosen as an appropriate solvent for PVA inks. The use of water as a single solvent resulted in frequent PVA clogging when the nozzles were undisturbed. Among the tested polymer ink compositions, the PVA inks in a water/DMSO mixture (4/1 v/v) with concentrations of 3 to 5 g/dL proved to be appropriate for piezoelectric DOD inkjet printing because they were well within the proper viscosity and surface tension range. When a dot was printed, the so-called 'coffee-ring effect' was significant, but its appearance was not prominent in line printing. The optimal polymer inkjet printing process was repeated slice after slice up to 200 times, which produced a well-defined, 3 D micro-patterned surface. The overall results implied that piezoelectric DOD polymer inkjet printing could be a powerful, solid-freeform, fabrication technology to create a controlled 3D architecture.

• Journal of Powder Materials
• /
• v.20 no.2
• /
• pp.120-124
• /
• 2013

This study is carried out to develop the new process for the fabrication of ultra-fine electrodes on the flexible substrates using superhydrophobic effect. A facile method was developed to form the ultra-fine trenches on the flexible substrates treated by plasma etching and to print the fine metal electrodes using conductive nano-ink. Various plasma etching conditions were investigated for the hydrophobic surface treatment of flexible polyimide (PI) films. The micro-trench on the hydrophobic PI film fabricated under optimized conditions was obtained by mechanical scratching, which gave the hydrophilic property only to the trench area. Finally, the patterning by selective deposition of ink materials was performed using the conductive silver nano-ink. The interface between the conductive nanoparticles and the flexible substrates were characterized by scanning electron microscope. The increase of the sintering temperature and metal concentration of ink caused the reduction of electrical resistance. The sintering temperature lower than $200^{\circ}C$ resulted in good interfacial bonding between Ag electrode and PI film substrate.