Tunable synthesis of metal-graphene complex nanostructures and their catalytic ability for solvent-free cyclohexene oxidation in air.

A one-step method was developed for the controllable construction of metal-graphene core-shell structures, hollow graphene nanospheres, and a high density of metal nanoparticles supported on graphene. The metal-graphene core-shell nanostructures as nanocatalysts show excellent catalytic ability for the selective oxidation of cyclohexene.