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. 2015 Aug 20;6:8029. doi: 10.1038/ncomms9029

Figure 1. Characterization of Graphene oxide and amine-modified GO.

Figure 1

(a,b) C1s XPS spectra for GO (a) and A-GO (b), respectively. (b, inset) N1s XPS spectrum for A-GO. (c,d) AFM topology images of ruptured monolayer GO (c) and A-GO (d) membranes after membrane deflection tests, respectively. (e,f) AFM topology images of ruptured pristine graphene and less-oxidized GO, respectively, after membrane deflection tests (images were adapted from refs 1, 6). (g–j) typical ductile and brittle force versus deflection curves for suspended GO (g,h) and A-GO (i,j) membranes, respectively. (k,l) AFM scanning images of a 500 × 500 nm area at a suspended GO membrane centre before (k) and after (l) testing. Scale bar, 500 nm (c,d,e). Scale bar, 1 μm (f).