  In the context of graphene-based composite applications, a complete
understanding of charge conduction in multilayer reduced graphene oxides (rGO)
is highly desirable. However, these rGO compounds are characterized by multiple
and different sources of disorder depending on the chemical method used for
their synthesis. Most importantly the precise role of interlayer interaction in
promoting or jeopardizing electronic flow remains unclear. Here, thanks to the
development of a multiscale computational approach combining first-principles
calculations with large scale transport simulations, the transport scaling laws
in multilayer rGO are unraveled, explaining why diffusion worsens with
increasing film thickness. In contrast, contacted films are found to exhibit an
opposite trend when the mean free path becomes shorter than the channel length,
since conduction becomes predominantly driven by interlayer hopping. These
predictions are favourably compared with experimental data and open a road
towards the optimization of graphene-based composites with improved electrical
conduction.
