Method of depositing oxidized carbon-based microparticles and nanoparticles

A process for the deposition of nano/microparticles, including at least graphene sheets, on a substrate, comprising the following steps:

• oxidizing at least the said graphene sheets;
• suspending the said nano/microparticles in at least one solution comprising at least water as solvent;
• spraying, by hydrodynamic instability, each suspension over the said substrate;
• heating the said substrate, during each spraying, so as to promote the complete evaporation of the said solvent from each part of each said suspension sprayed over the said substrate at a temperature less than or equal to one and a half times the boiling point of each said solution and less than or equal to 200° C.;
• annealing the said deposit after the said spraying(s) at a temperature sufficient to deoxidize at least the oxidized graphene present in the said deposit and greater than the temperature of the said substrate during the deposition step.