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. 2021 Oct 6;6(41):27080–27088. doi: 10.1021/acsomega.1c03658

Figure 4.

Figure 4

XPS C 1s spectra of (a) GO, (b) Pre-rGO, and (c) rGO1. (d) C–C (sp3) and C=C (sp2) bond concentrations. (e) Ratio of O 1s to the C 1s. (f) C–O bond concentration of each sample.