Towards atmospheric pressure plasma-assisted graphene transfer onto industrially relevant metallic surfaces

Graphene has been identified as an anti-corrosive material with several uses protecting industrial surfaces. To delve deeper into this matter, this study develops two atmospheric pressure plasma-assisted methodologies for applying graphene covertures to metallic surfaces. The first method, a three-step process (Synthesis → Dispersion → Application), involves synthesizing graphene via ethanol decomposition in a TIAGO torch at atmospheric pressure and subsequently, preparing dispersions of this material for application onto the surfaces. Optimal conditions for dispersion preparation were identified, including dispersing agents (isopropanol, ethylene glycol), graphene concentration (0.5 mg mL -1 ), and precise temperature control. The application of the dispersion by nebulization using a conventional airbrush provides proper surface coverage. The second method evaluated direct graphene transfer during synthesis, again using TIAGO torch as a plasma source. It provided a faster and efficient one-step procedure for successfully transferring graphene onto metallic surfaces. Surfaces characterization reveals high surface coverage, preservation of graphene quality, and superhydrophobic properties (approximately 180° water contact angles) of surfaces, a relevant milestone since water is a well-known corrosion inducing agent. Despite low adhesion to surfaces, some residual hydrophobic effects persisted post-graphene removal, evidencing a remaining surface modification.