Firstly, the morphology of GNRox an

Firstly, the morphology of GNRox and GNRred on the screenprinted platform surface was explored by FE-SEM in order to explore the material deposition on the screen-printed platforms. Fig. 1A-C shows the micrographs for graphene nanoribbons on CSPE. As it is indicated on the Fig. 1A, the non-modified CSPE surface was homogeneous and porous. In the case of GNRox on the CSPE, the morphology resembles thin curtains, and layers seem to be overlapped rather than aggregated. As for GNRred, these small fragments of graphene easily stack and accumulate on CSPE surface forming aggregated graphene mass piles randomly distributed on the CSPE electrode surface.