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12 November 2018 Laser direct writing using nanomaterials and device applications towards IoT technology
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The electronic interconnection based on solution processes using nanomaterials is one of the key technologies in the printed electronics towards flexible and wearable devices in IoT. The laser direct writing of three kinds of conductive micropatterns and the device applications were studied. The first one is a Cu micro-grid structure using a Cu nanoparticle ink and the application to a strain sensor. The second one is a reduced graphene oxide (rGO) interdigitated electrode prepared by laser-induced reduction of graphene oxide (GO) and the application of an rGO/GO/rGO interdigitated microelectrode to a humidity sensor. The third one is a carbon interdigitated electrode prepared by laser carbonization of a polyimide (PI) film and the application to an in-plane micro-supercapacitor (MSC). One of the important features in wearable devices is the stability and reliability under bending conditions. The influences of bending in the electric properties were studied for the Cu micro-grid and an rGO/GO/rGO interdigitated electrode. Remarkable resistance change of the Cu micro-grid structure was observed in bending experiment. An unusual large resistance change was explained by a nanostructure remaining even after sintering. On the other hand, the rGO/GO/rGO structure showed excellent stability of the output signal in humidity sensing experiments against bending. Such a stable electronic properties against bending stress was attributed to the electronic conductivity based on π−π interaction between graphene planes. A crystalline layered structure of graphene planes were clearly observed in TEM images for an rGO film.
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Akira Watanabe, Jinguang Cai, Sayaka Ogawa, Eiji Aoyagi, and Shun Ito "Laser direct writing using nanomaterials and device applications towards IoT technology", Proc. SPIE 10813, Advanced Laser Processing and Manufacturing II, 108130K (12 November 2018);

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