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A: Schematic of ADG design and structure. ADGs are 150-nm granular polyP NPs encapsulated in 200-nm sterically stabilized, PEGylated liposomes. B: Illustration of a biocompatible graphene sandwich trapping an ADG for high resolution imaging. To prevent beam-induced morphology change and mass loss in the electron microscopy analysis, the ADG is directely sandwiched between two layers of free-standing graphene.
