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AFM images of the modified nanodrug carriers of nGO. (a, a1) AFM image of pGO (nGO modified with 4-br-PEG-NH2), (a2) height profiles of line scannings in (a1); (b, b1) AFM image of pGO modified by FA and (b2) height profiles of line scannings in (b1); and (c, c1) AFM image of pGO-FA loaded with PTX and (c2) height profiles of line scannings in (c1).
