Preparation of surface-silvered graphene-CNTs/polyimide hybrid films: Processing, morphology and properties

► Graphene-carbon nanotubes (Gr-CNTs) nanocomposite has been in situ synthesized. ► The Gr-CNTs nanocomposite was used as a filler to synthesize Gr-CNTs/polyimide (PI) hybrid films. ► The conductivity of Gr-CNTs/PI can be regulated by regulating the content of Gr-CNTs in PI matrix. ► Surface-silvered Gr-CNT/PI was prepared by ion exchange and electrochemical reduction process. ► The surface-silvered Gr-CNT/PI hybrid film can improve the conductivity of this hybrid films.