Fig. 2
From: Radiolabeled nanomaterials for biomedical applications: radiopharmacy in the era of nanotechnology
Examples of nanomaterials available or under research worldwide, representing the main forms/structures, including polymeric nanoparticles, metal nanoparticles (gold and silver mainly), liposomes, mesoporous silica, and graphene (and graphene derivatives, like graphene quantum dots and graphene oxide)