Green synthesis of reduced graphene oxide using Nigella sativa seed extract

Reduced graphene oxide nanoparticles produced according to a method for green synthesis of reduced graphene oxide, the method comprising the steps of:

• a) mixing a quantity of carbon source in an acid while stirring to obtain a solution, b) adding a first oxidant gradually into the solution to oxidize the carbon source and obtain a suspension, c) stirring the suspension while maintaining a temperature of the suspension at about 35° C., d) adding Nigella sativa seed extract to the suspension while raising the temperature of the suspension to about 60° C., and e) adding hydrogen peroxide to the suspension;
• and
• isolating resulting reduced graphene oxide nanoparticles by centrifugation, wherein the graphene oxide nanoparticles have a mean diameter between 5 nm and 200 nm across the largest dimension and consist essentially of the Nigella sativa seed extract.