Abstract
In the present work, nanocrystalline samples of zinc oxide (ZnO) were synthesized via two different ways, namely sol-gel combustion and hydrothermal methods. The prepared samples were characterized through several analytical techniques in order to compare their various physical properties. Rietveld refinement analysis of x-ray diffraction (XRD) data confirms the hexagonal crystal symmetry with P63mc space group for both the samples. The bond angle (Zn-O-Zn) and bond length (Zn-O) between the atoms is determined. The surface morphology of the nanoparticles are investigated through scanning electron microscopy (SEM) images captured at 5,000x magnifications. The value of crystallite size is found to be 27 and 39 nm for the ZnO samples synthesized through sol-gel combustion and hydrothermal methods respectively. Fourier transform infrared (FTIR) spectra describe various vibrational modes linked to the functional groups present in the samples. The UV-visible diffuse reflectance spectra are used to study their optical properties. The bandgap is calculated by employing the Tauc's relation and found to be larger for the hydrothermally synthesized sample.
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