Figure 3. Elemental analysis of NCM57, NCM58 and NCM59.
(a) The content of C, N and O in three samples. High resolution N1s XPS spectra of (b) NCM57, (c) NCM58 and (d)NCM59. High resolution C1s XPS spectra of (e) NCM57, (f) NCM58 and (g) NCM59.
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