Laser sintering of Cu nanoparticles on PET polymer substrate for printed electronics at different wavelengths and process conditions
Juan Carlos HERNANDEZ-CASTANEDA1, Boon Keng LOK1, Hongyu ZHENG2()
1. Singapore Institute of Manufacturing Technology, Singapore 138634, Singapore 2. School of Mechanical Engineering, Shandong University of Technology, Zibo 255049, China
This study explores the feasibility of different laser systems to sinter screen-printed lines from nonconductive copper nanoparticles (Cu NPs) on polyethylene terephthalate polymer film. These materials are commonly used in manufacturing functional printed electronics for large-area applications. Here, optical and thermal characterization of the materials is conducted to identify suitable laser sources and process conditions. Direct diode (808 nm), Nd:YAG (1064 nm and second harmonic of 532 nm), and ytterbium fiber (1070 nm) lasers are explored. Optimal parameters for sintering the Cu NPs are identified for each laser system, which targets low resistivity and high processing speed. Finally, the quality of the sintered tracks is quantified, and the laser sintering mechanisms observed under different wavelengths are analyzed. Practical considerations are discussed to improve the laser sintering process of Cu NPs.
. [J]. Frontiers of Mechanical Engineering, 2020, 15(2): 303-318.
Juan Carlos HERNANDEZ-CASTANEDA, Boon Keng LOK, Hongyu ZHENG. Laser sintering of Cu nanoparticles on PET polymer substrate for printed electronics at different wavelengths and process conditions. Front. Mech. Eng., 2020, 15(2): 303-318.
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