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Graphene/Au Hybrid Antenna Coil Exfoliated with Multi‐Stacked Graphene Flakes for Ultra‐Thin Biomedical Devices
Author(s) -
Tetsu Yuma,
Kido Yusuke,
Hao Meiting,
Takeoka Shinji,
Maruyama Takeshi,
Fujie Toshinori
Publication year - 2020
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201901143
Subject(s) - materials science , graphene , conformable matrix , flexible electronics , nanotechnology , nanosheet , optoelectronics , electromagnetic coil , fabrication , electronics , electrical conductor , annealing (glass) , composite material , electrical engineering , medicine , alternative medicine , pathology , engineering
Flexible electronics with organic substrates have been developed for bio‐conformable devices and soft robotics. Although biodegradable polymers are preferred substrates for biomedical applications, they have poor heat durability, which precludes printing of conductive lines that require annealing at high temperatures (>250 °C). The fabrication of an ultra‐flexible, inkjet‐printed antenna coil with a resistivity of 4.30 × 10 −5 Ω‐cm is reported. It involves annealing of a graphene/Au antenna coil printed on a glass substrate and transferring onto a 182‐nm‐thick poly(D, L‐lactic acid) nanosheet by exfoliation of multi‐stacked graphene flakes. Then, a light‐emitting device, powered wirelessly, even in the rounded, twisted, or attached states, is fabricated by mounting a blue LED chip on the nanosheet antenna coil. The self‐deploying device is also stored in a water‐soluble capsule, injected into a silicone bag, released from the dissolved capsule, and operated wirelessly. This work facilitates the hybridization of conductive lines and biodegradable polymers on ultra‐flexible biomaterials for the biomedical application of flexible electronics.