Herein, we report a solid-state reduction
process (in contrast to solution-based approach) by using an
environmentally friendly reductant, such as vitamin C
(denoted VC), to be directly employed to solid-state graphene
oxide (GO) templates to give the highly active rGO
architecture with a sheet resistance of as low as 10 Ω sq−1.
In addition, predesigned rGO patterns/tracks with tunable
resistivity can be directly “written” on a preprepared solid GO
film via the inkjet-printing technique using VC/H2O as the
printing-ink. This advanced reduction process allows foreign
active materials to be preincorporated into the GO matrix to
form quality active composite architectures.