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XPS characterization of rGO prepared using different-sized GO in suspension. (a) General survey XPS spectra of three GO samples and corresponding rGO prepared using HI acid as reductant. (b–g) XPS C1s deconvolution spectra of (b) LGO, (c) MGO, (d) SGO, (e) r-LGO, (f) r-MGO, and (g) r-SGO.
