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XPS analysis of GOn and rGOn-PEG. (A) Atomic composition of GOn and content of C 1s and O 1s chemical functional groups resulting from spectra fitting; (B,C) Deconvolution of high-resolution (B) C 1s and (C) O 1s XPS spectra for GOn. (D) Atomic composition of rGOn-PEG and content of C 1s and O 1s chemical groups resulting from spectra fitting; (E,F) Deconvolution of high-resolution (E) C 1s and (F) O 1s XPS spectra for rGOn-PEG.
