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a) Survey XPS; b) C 1s; c) N 1s; d) Ti 2p; and e) O 1s spectra of anatase TiO2/RGO and amorphous TiO2/GO composites. f) EPR spectra of anatase TiO2/RGO and amorphous TiO2/GO composites, inset: enlargement of EPR spectra of anatase TiO2/RGO.
