Multifunctional Reduced Graphene Oxide-CVD Graphene Core-Shell Fibers

The insufficient electrical conductivity and mechanical stretchability of conventional graphene fiber based on reduced graphene oxide liquid crystals (rGO-LC) has limited its applications to numerous textile devices. Here we report a simple method to fabricate multifunctional fiber with mechanically strong rGO cores and highly conductive CVD graphene shells (rGO@Gr fiber), showing the outstanding electrical conductivity as high as ~137 S/cm and the failure strain value of 21%, which is believed to be the highest value among polymer-free graphene fibers. We also demonstrate the use of the rGO@Gr fiber for high power density supercapacitors with enhanced mechanical stability and durability, which would enable its practical applications to various smart wearable devices in the future.