Graphene/copper oxide nanoparticles thin films as precursor for graphene/copper hexacyanoferrate nanocomposites

•Innovative preparation route to complexes materials based on graphene/copper oxide.•Materials both synthesized and processed as thin films in one single step and one single pot.•Thin films easily deposited over any kind of substrates (plastics included) at room temperature.•Synthesized graphene/copper oxide materials used as precursor for novel graphene/Prussian blue analogues thin films.