386236.fig.004
Figure 4: FTIR spectra of PVA/BaG (a) and PVA/BaG/CNT–COOH (b) hybrids in selected ranges of the IR spectrum: (A) 4000–600 cm−1, (B) 4000–2800 cm−1 (Region 1), and (C) 1800–1500 cm−1 (Region 2). Inset: schematic illustration of hydrogen bonds formed between hydrophilic chemical groups (hydroxyls and carboxyls).