Durable and Flexible Bio-assembled RGO-BC/BC Bilayer Electrodes for Pressure Sensing

The new generation of electronics tends to be well-performed, facile and environmentally friendly. Here, we report a bio-assembled sensitive pressure senor based on reduced graphene oxide-bacterial cellulose/bacterial cellulose (RGO-BC/BC) bilayer films, integrated by bacteria in one step. The advantage of this integration is that there is strong nanofiber connection between the conductive RGO-BC and insulative highly compressible porous BC layer, which confers RGO-BC/BC film electrode with good robustness, tailorability, flexibility and wearability. Without extra bonding-interface or postprocessing, the RGO-BC/BC bilayer films could be directly assembled into pressure sensing devices. Ascribed from the good reversible compressibility of the BC layer and incorporated bilayer structure, the pressure sensor performs good sensitivity and excellent durability and bending stability. The facile sensitive capacitive sensor could monitor the human hand or finger motion in real time. The sensing array is able to detect the spatial distribution of pressure mounted in the flat plane as well as curved surface of human body, succeeding in the correction of human walking posture for health care. The e-skins are potential in wearable electronics, artificial intelligence, soft robots, healthcare etc.