Effect of Molar Concentration on the Physical Properties of ZnSO4 Thin Films Deposited by Chemical Spray Pyrolysis

Khalil Taha

doi:10.71229/q1ss3v59

Authors

Khalil Taha Jadaan Department of Physics, College of Science, University of Diyala, Diyala- Iraq

DOI:

https://doi.org/10.71229/q1ss3v59

Keywords:

ZnSo4 optical, Structural properties, Chemical Spray Pyrolysis Technique

Abstract

In the present study, nanostructured zinc sulfate (ZnSO4) thin films were synthesized on glass substrates by chemical spray pyrolysis method. The optical, structural and compositional properties were systematically investigated as a function of precursor concentration (0.1M) and (0.2 M). Optical characterization revealed that transmittance and reflectance increased with increasing concentration, whereas absorbance decreased. Correspondingly, the optical energy band gap narrowed with higher concentration. The formation of a hexagonal crystal structure was confirmed by X-ray diffraction (XRD) analysis, which was performed on all of the samples. Observations revealed that the average size of the crystallites decreased with increasing concentration, which correlates with the broadening of the full width at half maximum (FWHM). Fourier-transform infrared spectroscopy (FTIR) spectral analysis demonstrated the presence of various functional groups, notably metal-oxygen sulfate and hydroxyl (water-related) bonds. Field emission scanning electron microscopy (FESEM) images showed a homogeneous distribution of quasi-spherical nanoparticles with clearly defined grain boundaries, yielding an average grain size of approximately (70.90nm) within a range of ( 52.44 to 81.22nm).

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