Flexible and stretchable devices prepared by laser direct writing

Akira Watanabe; Rahman Ashiqur; Jinguang Cai; Mohammod Aminuzzaman

doi:10.1117/12.2576682

5 March 2021 Flexible and stretchable devices prepared by laser direct writing

Akira Watanabe, Rahman Ashiqur, Jinguang Cai, Mohammod Aminuzzaman

Proceedings Volume 11674, Laser-based Micro- and Nanoprocessing XV; 116740T (2021) https://doi.org/10.1117/12.2576682
Event: SPIE LASE, 2021, Online Only

Abstract

Several kinds of flexible and stretchable devices were fabricated by laser direct writing. A stretchable Ag paste was employed as a conductive material, which showed the suitable resistance stability in the application to a stretchable electronic device. A stretchable Ag paste coating on a polyurethane film was applied to the fabrication of a stretchable in-plane micro-supercapacitor (MSC) consisting of a carbon electrode which was prepared by laser ablation of a carbon nanotube (CN) layer on the stretchable Ag paste coating. The cyclic voltammogram of the device showed the capacitive characteristics even during stretching. The in-plane MSC consisting of CN electrode can be worked as a power source for a digital clock during stretching up to 44% elongation. A stretchable Ag paste coating pattern was also applied to an antenna-type sensor, where a screen printing mask for the stretchable Ag paste coating was prepared by laser ablation. A black-dye containing gel film on a silk cloth was patterned by galvano-scanning of ns pulse laser beam. A dipole-type antenna pattern consisting of a stretchable Ag paste coating was prepared on a polyurethane film. A reversible change of return loss at 5.317 GHz during stretching and shrinking of the antenna pattern was observed. A flexible antenna type sensor was also applied to agri-sensing, where the sensing mechanism was based on the change of the resonant properties of the antenna-type sensor caused by the dielectric condition change around the device. A flexible spiral antenna-type sensor on a silicone elastomer sheet was fabricated by printing of a stretchable Ag paste through a gel film mask, where a spiral antenna pattern was drawn by laser ablation of a black gel film on the silicone elastomer sheet. The sensing of the drying process of a plant leaf was observed by the antenna type sensor. The change of the return loss spectrum can be attributed to the change of the water content in a plant tissue which influenced the dielectric properties of the plant leaf.

Conference Presentation

Citation Download Citation

Akira Watanabe, Rahman Ashiqur, Jinguang Cai, and Mohammod Aminuzzaman "Flexible and stretchable devices prepared by laser direct writing", Proc. SPIE 11674, Laser-based Micro- and Nanoprocessing XV, 116740T (5 March 2021); https://doi.org/10.1117/12.2576682

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