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. 2015 Aug 14;5:13083. doi: 10.1038/srep13083

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(A) FTIR spectra, (B) Raman spectra, (C,D) XPS spectra of C 1 s (C) and Fe 2p (D) of various samples: (a) GO; (b) rGO; (c) TiO₂; (d) rGO-TiO₂; (e) Fe(III)/TiO₂; (f) Fe(III)/rGO-TiO₂.