Figure 2.

(a) Original infrared absorption spectra of SFN and NAR. (b) Base-line corrected infrared absorption spectra of SFN, NAR and SFN_NAR-1.2. The SFN and the SFN_NAR spectra are normalized to an absorbance of 1 at the maximum of the amide III band at 1229 cm^−1. The NAR spectrum is normalized to an absorbance of 1 at 1156 cm⁻¹. All samples were measured as a dry film obtained from a 30% EtOH solution. Orange dots indicate the baseline points.