Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 212, Issue 3, Pages 700-706Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2011.10.024
Keywords
Copper nano-ink; Multi-nozzle; Electrohydrodynamic; Inkjet printing; Cross-talk; Micro-tracks
Funding
- Ministry of Knowledge Economy, South Korea
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To overcome the limitation of low production speed of electrohydrodynamic (EHD) inkjet printing technology and to fabricate low cost electronic micro-structures, this paper presents the direct deposition of copper colloidal solution through the multi-nozzle EHD inkjet printing process. Multi-nozzle EHD inkjet printing head, consisting of five nozzles, was used for simultaneous printing of electrically conductive micro-tracks onto the glass substrate. Nozzle-to-nozzle distance and experimental conditions were optimized to prevent the interaction i.e., cross-talk between electrically charged neighboring jets. After sintering in inert (N-2 gas) atmosphere, printed tracks exhibited approximately five times larger resistivity (9.20 mu Omega cm) than that of the bulk copper which is a remarkable achievement. These electrically conductive micro-tracks show the feasibility of multi-nozzle EHD inkjet printing technique using the copper nano-colloidal ink for low cost fabrication of microelectronic structures and devices. (C) 2011 Elsevier B.V. All rights reserved.
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