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. 2021 Jun 1;11(6):1469. doi: 10.3390/nano11061469

Figure 8.

Figure 8

Example of the XPS C1s peak of MWCNT, showing the C=C peak sp2 (red), the C-C peak sp3 (green), a C-O peak (blue), and the π–π* transition (situated at 291 eV, but not indicated), cited from [73].