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XPS analysis of the M-MWCNT and C-MWCNT: (a,b) XPS survey scan spectra of M-MWCNT and C-MWCNT. The inset is magnification of the N1s region in M-MWCNT and C-MWCNT spectrum. (c,d) Fitted XPS C1s spectra of M-MWCNT and C-MWCNT. (e,f) Fitted XPS O1s spectra of M-MWCNT and C-MWCNT. (g,h) Fitted XPS N1s spectra of M-MWCNT and C-MWCNT.
