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. 2017 Feb 7;7:41896. doi: 10.1038/srep41896

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(a) XRD patterns of composite powders after freeze drying, drying in vacuum and reduction in H₂, (b) FTIR spectra of GO before and after Cu²⁺ ions are added, (c) Proposed mechanism for the epoxide ring-opening reaction assisted by Cu²⁺ ion, (d) C1s XPS spectrum of GO-CuO composite powder, and (e) C1s XPS spectrum of RGO-Cu composite.