The peaks between the bands of 1300 and 1350 cm−1 (C−N+ stretching), 1491 cm−1, and 1609
cm−1 (C−C stretching of the benzene ring) are attributed to the doped PANI in the form of emeraldine salt (PANI-ES).27 At the same time, the peaks at 1160 and 1217 cm−1 (C−H
bending of the quinoid ring) revealed the presence of PANI in the emeraldine base form (PANI-EB).28,29