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. 2020 Oct 21;11:5323. doi: 10.1038/s41467-020-19182-1

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© The Author(s) 2020

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Fig. 1 — a Top-view SEM image. b Cross-section SEM image. c TEM image of a single CNT. d Raman spectra e XPS spectra of O, N, and C. f Deconvolution of the C1s XPS peak.