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The XPS C1s spectra of GO, rGO, and rGO/PVAc-PDDA are shown in (a–c). The XPS O1s spectra of GO, rGO, and rGO/PVAc-PDDA are shown in (d–f), while the XPS N1s spectra of GO, rGO, and rGO/PVAc-PDDA are presented in (g–i) [152]. Copyright 2021; reproduced with permission from Elsevier B.V. All rights reserved.
