Metal Cation‐Modified Graphene Oxide as Precursor for Advanced Materials: Thin Films of Graphene/Prussian Blue Analogues
Caroline Mariano Ferreira, Maria Karolina Ramos, Aldo J. G. Zarbin
Abstract
Abstract This work reports a simple, direct, and easy route to prepare thin films between graphene‐like materials and two hexacyanometallates, based on metal cation modification in graphene oxide (GO) thin films obtained by the liquid/liquid interfacial route. The reaction between GO and Cu 2+ or Fe 3+ ions in aqueous solution yields GO/Cu 2+ or GO/Fe 3+ , and the nature of the interactions between the GO and the metal cations were demonstrated by FT‐IR. GO/Cu 2+ and GO/Fe 3+ can be chemically reduced to reduced graphene oxide/metal nanoparticles (rGO/Cu or rGO/Fe) thin films. Both GO/metal cation or rGO/metal nanoparticles thin films were used as working electrodes for electrodeposition of their respective hexacyanometallates (Prussian blue, PB, and its copper analogue, Cu‐PBA) based on a heterogeneous reaction between ferricyanide ions in the electrolyte solution and the metallic species in the electrode. The PB and Cu‐PBA formation in all electrodes was confirmed by Raman spectroscopy, X‐ray diffraction, cyclic voltammetry, and scanning electron microscopy, characterized as well‐defined nanometric cubes homogeneously dispersed over the rGO sheets.