Ultraprecise 3D Printed Graphene Aerogel Microlattices on Tape for Micro Sensors and E-Skin

摘要

3D printed graphene aerogels hold promise for flexible sensing fields dueto their flexibility, low density, conductivity, and piezo-resistivity. However,low printing accuracy/fidelity and stochastic porous networks have hinderedboth sensing performance and device miniaturization. Here, printablegraphene oxide (GO) inks are formulated through modulating oxygenfunctional groups, which allows printing of self-standing 3D graphene oxideaerogel microlattice (GOAL) with an ultra-high printing resolution of 70 μm.The reduced GOAL (RGOAL) is then stuck onto the adhesive tape as a facileand large-scale strategy to adapt their functionalities into target applications.Benefiting from the printing resolution of 70 μm, RGOAL tape shows betterperformance and data readability when used as micro sensors and robote-skin. By adjusting the molecular structure of GO, the research realizesregulation of rheological properties of GO hydrogel and the 3D printing oflightweight and ultra-precision RGOAL, improves the sensing accuracy ofgraphene aerogel electronic devices and realizes the device miniaturization,expanding the application of graphene aerogel devices to a broader field suchas micro robots, which is beyond the reach of previous reports.