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Representative SEM images of (a) GO10, (b) GO100 and (c) GO325 samples. TEM micrographs for (d) rGO10-3, (e) rGO100-3, (f) rGO325-3, (g) NrGO10-4, (h) NrGO100-4 and (i) NrGO325-4 samples. NrGO: N-doped reduced graphene oxide, rGO: reduced graphene oxide.
