Figure 1.

AFM characterization. (A) AFM images of GO, nGO, nGO-PEG, and nrGO-PEG. AFM histograms of (B) diameter and (C) thickness for GO, nGO, nGO-PEG, and nrGO-PEG. The diameter was assumed to be in round shape.

Chen et al. Nanoscale Research Letters 2014 9:86   doi:10.1186/1556-276X-9-86
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