GO Chitosan PSS
Wavenumber (cm-1) Assignment Wavenumber (cm-1) Assignment Wavenumber (cm-1) Assignment
1733 imageC=O ~1655 imageC=O 1633 imageC=C
1610 imageas COO- 1510 δ-NH3+ 1598 C=C
1427 images COO- 1409 δ O-H/C-H 1498 imageC=C
1222 imageC=O 1155 C-O-C 1452 C=C
1045 nC-O 1089 imageC-O 1180 imageas S=O
        1128 ring
        1041 images S=O
        1006 δ ring

Table 1: FTIR peaks positions and assignments [19-22,24] for GO, chitosan and PSS films. In the table, the molecules vibrations are abbreviated usingn: stretching; imageas: asymmetric stretching; images: symmetric stretching; δ: deformation.