Table 1.

The FTIR results of PVA and ZnS–PVA nanofluid.

assignment	observed wavelength for PVA (cm−1)	observed wavelength for ZnS–PVA (cm−1)	reference
OH stretching	3280	3290	[20–21]
CH2 asymmetric stretching	2917	2923	[20–21]
C=O carbonyl stretching	1690	1718	[20–22]
CH2 bending	1425	1430	[20–21]
C–H deformation	1324	—	[20–21]
C–H wagging	—	1245	[22–23]
C–O stretching	1081	1080	[20–21]
C–C stretching	839	830	[20–21]
ZnS NPs	—	390	[23]