Graphene/Au Hybrid Antenna Coil Exfoliated with Multi‐Stacked Graphene Flakes for Ultra‐Thin Biomedical Devices

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.

具有有机基底的柔性电子产品已被开发用于生物适形设备和软体机器人。尽管生物可降解聚合物是生物医学应用的首选基底，但它们的耐热性较差，这使得无法印刷需要在高温（>250°C）下退火的导电线。报道了一种电阻率为4.30×10⁻⁵Ω·cm的超柔性喷墨印刷天线线圈的制造。它包括对印刷在玻璃基底上的石墨烯/金天线线圈进行退火，然后通过剥离多层石墨烯薄片将其转移到182纳米厚的聚（D，L - 乳酸）纳米片上。然后，通过在纳米片天线线圈上安装一个蓝色发光二极管芯片，制造出一个即使在弯曲、扭曲或附着状态下也能无线供电的发光装置。这种自展开装置还被存储在水溶性胶囊中，注入硅胶袋，从溶解的胶囊中释放出来，并进行无线操作。这项工作促进了导电线和生物可降解聚合物在超柔性生物材料上的混合，以用于柔性电子产品的生物医学应用。