Restructuring of Graphene Oxide Sheets into Monodisperse Nanospheres

We demonstrate a method to restructure graphene oxide sheets into monodisperse solid 17 nm nanospheres by tuning the solution ionic strength. This method enables the preparation of both two-dimensional self-assemblies comprising three-dimensional GO nanospheres and three-dimensional super assemblies of GO clusters via dispersal into an aerosol. The GO super assemblies are more thermally stable than single crumpled sheets. Finally, we demonstrate that GO nanospheres and their assemblies can be thermally processed to form reduced GO with high aromatic character while still maintaining their spherical conformation.