Fig. 2: XPS and FTIR results.
From: Functionalized melanin for enhanced energy storage in aqueous and ionic liquid electrolytes
Spectroscopic analysis of (a–d) Mel-Boc films and (e–h) Mel-NO2 films. a and e show ATR FTIR-spectra; (b–d) and (f–h) XP (X-Ray Photoelectron) spectra. Important bands in (a and e) are marked with wave numbers directly next to the plotted graph. For both substances, the C 1 s (b, f), O 1 s (c, g), and N 1 s (d, h) spectra are shown.
