The different easiness of the analyte to be oxidized and to donate the electrons to the electrodic surface could be explained because of the interaction between analyte and carbon material. Indeed, it could be said that, carbon paste represented as graphite (CSPE) and MWCNT suffer from the same interactions (weak π-π adsorption) with the analytes and the capability of donating electrons is the same range. As for GNRox the voltammograms obtained suggest that the interaction seems to be slightly bigger
with AA, but the electron transference rate is not high enough to allow a clear differentiation between the electrons donated by AA from those ones donated by the other analytes. Remarkably, the GNRred characterized by small layers, additionally present a structure with a low percentage of oxygen moieties in the edges capable of differently interacting with the analytes. Likewise the higher content of sp2 carbons compared to GNRox allowed the higher electron transference rate to get tight voltammograms peaks with satisfactory resolution to simultaneously detect the three molecules.