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XPS spectra showing full scan and deconvoluted C1s peaks of (A, B) natural GR and (C, D) CL-graphene.
Note: (D) C denotes C-C/C=C functional groups; D denotes C=O/C-NH; E denotes C-OH/C-O.
Abbreviations: XPS, X-ray photoelectron spectroscopy; GR, graphite; CL, collagen; Expt, experimental.
