Abstract
Ink-jet 3D printing technology facilitates the use of various materials of ink on each ink-jet head and simultaneous printing of multiple materials. It is suitable for manufacturing to process a complex multifunctional structure such as sensors and printed circuit boards. In this study, a complex structure of a SiO2 insulation layer and a conductive Cu layer was fabricated with photo-curable nano SiO2 ink and Intense Pulsed Light (IPL)-sinterable Cu nano ink using multi-material ink-jet 3D printing technology. A precise photo-cured SiO2 insulation layer was designed by optimizing the operating conditions and the ink rheological properties, and the resistance of the insulation layer was 2.43 × 1013 Ω·cm. On the photo-cured SiO2 insulation layer, a Cu conductive layer was printed by controlling droplet distance. The sintering of the IPL-sinterable nano Cu ink was performed using an IPL sintering process, and electrical and mechanical properties were confirmed according to the annealing temperature and applied voltage. Then, Cu conductive layer was annealed at 100 °C to remove the solvent, and IPL sintered at 700 V. The Cu conductive layer of the complex structure had an electrical property of 29 µΩ·cm and an adhesive property with SiO2 insulation layer of 5B.
Highlights
Accepted: 11 May 2021The printed electronics industry using ink-jet printing technology has been in the spotlight as a next-generation technology
We investigated the ink-jet 3D printing process using multiple materials to produce electronic circuit structures
SiO2 particles were combined with hexanediol diacrylate (HDDA, Miwon chemical, Ulsan, Korea), a photo-curable acrylic monomer, by stirring the mixture at room temperature for 3 h [17,18]
Summary
Accepted: 11 May 2021The printed electronics industry using ink-jet printing technology has been in the spotlight as a next-generation technology. Ink-jet printing technology has been actively researching 3D printing technology, which accurately stacks various ink-type materials from multiple print heads [1,2,3,4]. The ink-jet 3D printing technology can effortlessly print complex multifunctional structures by printing multi-material ink with different physical and chemical properties at the same time [5,6,7,8,9]. Despite these advantages, research of ink-jet 3D printing using multiple materials still need to resolve many technical hurdles
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