Laser sintering of Cu nanoparticles on PET polymer substrate for printed electronics at different wavelengths and process conditions

Frontiers of Mechanical Engineering - Tập 15 - Trang 303-318 - 2019
Juan Carlos Hernandez-Castaneda1, Boon Keng Lok1, Hongyu Zheng2
1Singapore Institute of Manufacturing Technology, Singapore, Singapore
2School of Mechanical Engineering, Shandong University of Technology, Zibo, China

Tóm tắt

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.

Tài liệu tham khảo

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