Effect of precursors medium on structural, optical and dielectric properties of CuO nanostructures

The current work presented the effect of different precursor's medium on structural, optical, morphological, dielectric and complex impedance properties of CuO nanostructures prepared via sol-gel technique. The structural and surface morphology analysis of the as- synthesized samples are carried out by using the X-ray diffraction (XRD) and SEM. XRD study revealed that the as-synthesized CuO nanostructures are pure phase with monoclinic structure. The average crystallite size (D) of CuO nanostructures deliberated via Scherrer's formula is found to be increasing for S1, S2 and S3 samples, respectively. Photoluminescence and Fourier-transform infrared spectroscopy analysis also divulged that, the synthesized samples i.e. CuO is a pure phase with monoclinic structure. The optical energy band gaps (Eg), estimated through Tauc plots are found to be 3.7, 3.5 and 2.6 eV for S1, S2 and S3 samples, respectively. The AC conductivity (σAC), dielectric constants (ε') and dielectric loss (tanδ) of all the samples were premeditated at room temperature in the frequency range 10 Hz-5 MHz. All characterization results revealed that different precursors (i.e. copper salts) play a significant function in modification the structural, morphological, optical and dielectric properties of CuO nanostructures for industrial applications.