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(a) AFM image of as-made graphene oxide (GO). (b) AFM of covalently PEGylated nanographene oxide (nano-GO). (c) AFM of reduced nanographene oxide (nano-rGO). All images are on a 10 nm height scale. (d–f) Schematic drawings of (d) as-made GO, (e) nano-GO, and (f) nano-rGO illustrating the reaction steps. Reprinted with permission from ref (17). Copyright 2011 American Chemical Society.
