Enhanced Sensitivity of Surface Plasmon Resonance Biosensor Functionalized with Doped Polyaniline Composites for the Detection of Low-Concentration Acetone Vapour

Table 1

Assignment of FTIR peaks in PANI/chitosan and ternary composites.

	Absorption frequencies (cm^-1)
	PANI/chitosan	Ternary
NH stretching	3433	3433
OH group	3433	3433
CH stretching	2853, 2916	2853, 2919
C-N stretching	1695	1584
C=C quinoid ring	1487	1491
C=C benzoid ring	1633	1589
Protonation of imine nitrogen	1274	1295
CH bending	799	805
SO3^- group	1079	1088
C-S vibration mode	559	560