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High resolution XPS spectra of the PEDOT/GO surface after treatment with p20 in conjugation with EDC/NHS. Deconvoluted peaks of the (a) C1s region (C1: C-C; C2: C-O/C-S; C3: C-O-C; C4: N-C=O; C5: O-C=O) and (b) N1s region (N1: C-N; N2: N-C=O; N3: protonated amine).
