Fabrication of layer-by-layer graphene oxide thin film on copper substrate by electrophoretic deposition

In this paper, we investigate the fabrication of graphene oxide (GO) films on copper substrates by means of an electrophoretic technique, with the aim of realizing conductive thin films that could be applied as reliable electrical contacts for use in various applications. Uniform films were fabricated, and the film thickness measured using atomic force microscopy. The graphene oxide film thickness is estimated to range from a few manometers to several tens of manometers, depending on the deposition time. Cross-sectional transmission electron microscopy images indicate that the films possess a multi-layered structure, and that the distance between layers is approximately 0.5 nm. Furthermore, the electrical contact resistance of the films was measured, using conductive probe atomic force microscopy. The prepared GO films exhibit electrical conductivity due to their layered structure, which affects their electrical properties. (author)