[18a-A204-1~10] 12.3 Functional Materials and Novel Devices

△ [18a-A204-9] Development of inkjet-printed thin film antenna coil consisting of graphene flake

〇(M2)Yuma Tetsu¹, Shinji Takeoka¹, Toshinori Fujie^2,3 (1.Grad. Sch. Adv. Sci. & Eng., Waseda Univ., 2.WIAS, Waseda Univ., 3.JST PRESTO)

Keywords:graphene, inkjet printing, antenna coil

Wireless power feeding, which induce electromotive force in the coil by using electromagnetic induction and resonance phenomenon, enables feeding power to device without any wire. Thin film antenna with an inkjet-printed coil is expected to feed electric power from outside to the device such as pacemaker. To this end, we envisioned the development of thin film antenna coil by using inkjet printing. Graphene ink and Au nano ink was printed on glass substrate for coil (thickness: 1.47 μm, line width: 400 μm, total length: 29.6 cm). After annealing (250℃, 20 min), the low resistance printed coil (44.6 ± 7.8 Ω) was exfoliated by poly-D,L-lactic acid and Poly vinyl alcohol supporting bilayer (thickness 10 μm). Since graphene was confirmed on both sides of the peeled antenna coil and the glass substrate, it became apparent that the printed line was peeled from the substrate due to part of the layered graphene being torn. Then, mounting chip LED and jumper wiring (thickness 208 nm, wiring part 2 mm × 10 mm) to the thin film antenna coil (182 nm), a thin film light emitting device (total film thickness: <2 μm, resonance frequency : 33.0 MHz) was prepared. The blue LED was turned on with wireless power supply (20 V_p-p, 30 MHz) (irradiance 1.22 W / m², feeding distance 3 mm), even with the thin-film light emitting device bent.