Figure 3From: Fabrication of biocompatible and mechanically reinforced graphene oxide-chitosan nanocomposite filmsXPS N1s core-level spectra of (a) GO, (b) chitosan, (c) GO-chitosan and (d) GO/chitosan mix. The peaks 1, 2 and 3 correspond to C-NH2, C-NH-C=O, C-N+, respectively.Back to article page