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(a) FT-IR spectra of GO and the product prGO obtained at the irradiation time of 12 h; (b) Survey XPS spectrum of the whole-range spectrum of GO; (c) Survey XPS spectrum of the whole-range spectrum of prGO with irradiation time of 12 h; (d) C 1s XPS spectra of GO and the product prGO with irradiation time of 12 h.
