Structural Investigations on Hydrothermally Grown ZnO Nanostructures

Abstract

This study investigates the influence of aqueous solution molarity on the structural characteristics of zinc oxide (ZnO) grown by hydrothermal method. From the X-ray diffraction (XRD) patterns of the ZnO nanostructures, the diffraction peaks confirm the ZnO hexagonal wurtzite type crystalline structure. To investigate the structural properties of ZnO structures in more detail, we analyze the XRD line profiles of the samples by Warren-Averbach model. Based on the model, the diffraction intensity of the XRD is calculated in Fourier space and the information on the size distribution can be derived. Observing the calculated nanostructure size distribution of the samples, we can see that the breadth of the size distribution function decreases then increases with increasing molarities. Furthermore, the theoretical analyzed results are verified by photoluminescence (PL) measurements and the scanning electron microscope (SEM) images.

pH-Dependent Formation of Oriented Zinc Oxide Nanostructures in the Presence of Tannic Acid

“…The unique properties of the ZnO semiconductor are caused by the generation of novel phenomena driven by interactions at their interfaces due to the presence of surfactants in between the aligned nanostructures, that promote the OA based on surfactant interaction-related driving forces for self-assembly formation, kinetic stabilization between the intermediate nanoparticles, and control of coalescence preferential crystal face or the morphology of the nanocrystal [ 9 , 12 , 13 ]. The hexagonal wurtzite-type structure of ZnO has the ( P 63 mc ) space group, with two formula units in the unit cell with all atoms occupying composed of alternating planes of tetrahedral coordinated by O 2− and Zn 2+ ions in an ABAB pattern (hexagonal close packing) at c-axis [ 14 , 15 ]. The produced dipole moment normal to the basal (0001) plane is common for ZnO nanostructures induced by the opposite stack charged ions.…”