Abstract
In this paper, the optimization studies on the structural, morphological and electrical properties of undoped and Al doped ZnO nanopowders by microwave assisted hydrothermal method were performed. The ZnO nanopowders were prepared in different zinc acetate and NaOH molarities and after the determination of the best powder conditions, Al doped ZnO powders were obtained under these conditions. The surface morphology of ZnO nanoparticles is influenced by the starting solution type and molarity. Different morphologies of ZnO microstructures were obtained by adjusting the concentration of Zn2+ and OH−. The structural, morphological, electrical and optical properties of these nanopowders were investigated using X-ray diffractometer, scanning electron microscopy, DC electrical measurements and reflectance measurements. The incorporation of Al in ZnO nanopowder was also changed the morphology of these powders. The presence of Al+3 ions in ZnO nanopowder was determined by XPS measurements. Conductivity and resistivity values of ZnO nanopowders varied with Al incorporation. As the amount of Al in ZnO increases, their resistivities have decreased and their conductivities have increased. The optical band values of Al doped ZnO nanopowders were found via reflectance measurements using kubelka-munk function. As a result of Burstein-moss effect, the optical band values increased with the increase of the Al dopant.
Published Version
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