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. 2014 Nov 25;4:7171. doi: 10.1038/srep07171

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(a) XRD pattern of Fe₂O₃-NC/GN-2; (b) Raman spectra of pure GN, Fe₂O₃ and Fe₂O₃-NC/GN-2; (c) TG curves Fe₂O₃-NC/GN; (d) XPS spectra of Fe₂O₃-NC/GN-2; (e) XPS Fe2p spectrum; (f) XPS N1s spectrum.