Reduced graphene oxide coated SiO2/Si substrates were obtained by wet-chemical reduction of graphene oxide for the use as semiconductor material in field-effect transistors. The morphological and chemical characterization was done by using SEM, Raman spectroscopy and XPS. Raman and XPS measurements can characterize the success of the graphene-oxide reduction, but only for small parts spots of the surface (e.g. 0.41 µm 2 laser spot size with Raman). In order to evaluate larger surface areas and the electrochemical activity of the graphene oxide and reduced graphene oxide, additional spectroscopic measurements using the SECM were performed. The samples coated with unreduced graphene oxide showed no electrochemical activity, while reduced graphene oxide samples showed conducting properties. Further information about the topology of the surface was obtained by applying the SECM constant distance mode. The degree of graphene coverage was calculated from SECM data and compared to the coverage obtained by SEM. It was found that 68±7% coverage is sufficient to ensure electronic contact between the Source and Drain electrodes (resistance less than 1 kΩ). Functionality of the fabricated field effect transistors was demonstrated by titration of pH solutions and characterization of the characteristic curves.

The aeronautical industry demands facile lightweight and low-cost solutions to address climate crisis challenges. Graphene can be a valid candidate to tackle these functionalities, although its upscalability remains difficult to achieve. Consequently, graphene-related materials (GRM) are gathering massive attention as top-down graphite exfoliation processes at the industrial scale are feasible and often employed. In this work, environmentally friendly produced partially oxidized graphene nanosheets (POGNs) reduced by green solvents such as l-Ascorbic Acid to rGNs are proposed to deliver functional coatings based on a glass fiber composite or coated Al2024 T3 for strategic R&D questions in the aeronautical industry, i.e., low energy production, de-icing, and water uptake. In detail, energy efficiency in rGNs production is assessed via response-surface modeling of the powder conductivity, hence proposing an optimized reduction window. De-Icing functionality is verified by measuring the stable electrothermal property of an rGNs based composite over 24 h, and water uptake is elucidated by evaluating electrochemical and corrosion properties. Moreover, a mathematical model is proposed to depict the relation between the layers’ sheet resistance and applied rGNs mass per area, which extends the system to other graphene-related materials, conductive two-dimensional materials, and various substrates. To conclude, the proposed system based on rGNs and epoxy paves the way for future multifunctional coatings, able to enhance the resistance of surfaces, such as airplane wings, in a flight harsh environment.