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Graphene–nanoparticle composite composed of GO sheets decorated with AuNPs. (A) AFM image of a single GO sheet and (B) a GO sheet decorated with 3.5 nm AuNPs. The corresponding curves on the right side show the thicknesses of the GO sheet and the GO/AuNP sheet. (C and D) TEM images of the GO/AuNP sheet with different magnifications. Inset of (D) shows a high-resolution TEM image of a single AuNP. Reprinted with permission from ref 41. Copyright 2013 American Chemical Society.
