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http://dx.doi.org/10.6117/kmeps.2021.28.2.089

Room-temperature Bonding and Mechanical Characterization of Polymer Substrates using Microwave Heating of Carbon Nanotubes  

Sohn, Minjeong (Micro-Joining Center, Joining R&D Group, Korea Institute of Industrial Technology)
Kim, Min-Su (Micro-Joining Center, Joining R&D Group, Korea Institute of Industrial Technology)
Ju, Byeong-Kwon (Display and Nanosystem Laboratory, School of Electrical Engineering, Korea University)
Lee, Tae-Ik (Micro-Joining Center, Joining R&D Group, Korea Institute of Industrial Technology)
Publication Information
Journal of the Microelectronics and Packaging Society / v.28, no.2, 2021 , pp. 89-94 More about this Journal
Abstract
The mechanical reliability of flexible devices has become a major concern on their commercialization, where the importance of reliable bonding is highlighted. In terms of component materials' properties, it is important to consider thermal damage of polymer substrates that occupy large area of the flexible device. Therefore, room temperature bonding process is highly advantageous for implementing flexible device assemblies with mechanical reliability. Conventional epoxy resins for the bonding still require curing at high temperatures. Even after the curing procedure, the bonding joint loses flexibility and exhibits poor fatigue durability. To solve this problems, low-temperature and adhesive-free bonding are required. In this work, we develop a room temperature bonding process for polymer substrates using carbon nanotube heated by microwave irradiations. After depositing multiple-wall carbon nanotubes (MWNTs) on PET polymer substrates, they are heated locally with by microwave while the entire bonding specimen maintains room temperature and the heating induces mechanical entanglement of CNT-PET. The room temperature bonding was conducted for a PET/CNT/PET specimen at 600 watt of microwave power for 10 seconds. Thickness of the CNT bonding joint was very thin that it obtains flexibility as well. In order to evaluate the mechanical reliability of the joint specimen, we performed lap shear test, three-point bending test, and dynamic bending test, and confirmed excellent joint strength, flexibility, and bending durability from each test.
Keywords
polymer substrate; microwave; carbon nanotube; room temperature bonding; mechanical reliability;
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Times Cited By KSCI : 1  (Citation Analysis)
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