Journal
OPTICS AND LASERS IN ENGINEERING
Volume 80, Issue -, Pages 12-16Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2015.12.007
Keywords
Cu; Nano-ink; Laser sintering; Patterning; Flexible substrate
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Funding
- National Research Foundation (NRF) - Ministry of Education, Science and Technology of Korea [2009-0081142]
- National Research Foundation of Korea [2009-0081142] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We here present a simple, low-cost laser-direct process to fabricate conductive Cu patterns on plastic substrate. A Cu nano-ink was synthesized using Cu formate as a precursor. The Cu ink spin-coated on a polyimide substrate was selectively sintered using a pulsed ultraviolet laser beam. The unexposed regions of the coated ink could be removed by rinsing the whole film in the dispersion agent of the synthesized ink, which revealed a conductive Cu pattern. This allowed sintering and patterning to be simultaneously accomplished, with a minimum line width of similar to 20 mu m available. The fabricated pattern remained strongly adhesive to the substrate and exhibited only a slight increase in resistance even after 1000 bending cycles to a radius of curvature of 4.8 mm. (C) 2015 Elsevier Ltd. All rights reserved.
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