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Influence of Natural Crocus Dye on Morphological and Optical Properties of (PVA/TiO2) Nanocomposite Prepared by the Spin Coater Method

College of Education for Pure Sciences, Department of Physics, University of Babylon, Iraq
*(e-mail :; Mobile : 78094 93899)
(Received : April 30, 2022; Accepted : May 19, 2022)


The nanocomposite (PVA/TiO2/crocus) was prepared and four films were obtained with different
concentrations of crocus dye. The results of optical microscopy observed nanoparticles created a
continuous network inside polymers. This network had routes that allowed charge carriers to move via
them inside the nanocomposites. The vibrational peaks at 3387, 3325.28, 1705.07 and 1080.14/cm were
assigned to O–H stretching, C–H stretching, C–H bend of CH2, C-O and CH rocking of (PVA/TiO2/crocus
dye), respectively along with another vibrational peaks for concentrations of nanocomposites. Increased
concentration had generated new bonds in this range. Decreasing the FT-IR spectrum in the range of
3387 to 3367.71/cm showed the produced polymer chains which corresponded to O–H stretching and C–
H stretching bond. The absorbance for all films had the appearance of a peak at 440 nm, which was due
to the crocus dye, and had the greatest transmittance of 81.5 at a concentration of 1 ml, and then it
started to decrease. The energy gap decreased from 307eV to 3.58 eV with increased concentration of
crocus dye.
Key words : Crocus natural dye, polyvinyl alcohol films/TiO2 nanoparticles, optical properties, (PVA/TiO2/crocus dye) nanocomposites, spin coater method, FTIR