As shown in Fig. 2, the CS, GO and all of the synthesized composites
were characterized by FTIR spectra. In the IR spectrum of CS (Fig. 2a),
the broad band at around 3443 cm−1 was due to the overlapped of
amine and hydroxyl groups stretching vibrations. The strong peaks at
1631 cm−1 and 1522 cm−1 could correspond to the C_O stretching
vibration of NHCO (amide I) and the NH bending of NH2, respectively
[42]. The peak at 1323 cm−1 was due to COH stretching.
The two characteristic absorption bands of CS glycosyl were centered