Burcu Bozkurt Çırak

Hydrothermal growth of ZnO nanoparticles under different conditions

Abstract In this study, a simple low-temperature hydrothermal method was used to synthesize ZnO nanoparticles. The structural, morphological and optical characterizations of the nanoparticles were evaluated with regard to the zinc content. To achieve this, the molar ratios of the precursors were changed from 0.05 to 0.1 M. The structural and morphological analyses showed that all samples had a polycrystalline hexangular wurtzite crystal structure and the shape of the ZnO nanoparticles changed with increasing zinc content. A possible growth mechanism of the ZnO nanoparticles is explained in terms of the zinc content. Optical measurement revealed that the shape of the nanoparticles affects the position of the band-edge emission as well as the shape of the luminescence spectrum.

Effects of Some Parameters on WO3 Nanostructures Synthesized by Spin Coating Technique

In this study, WO3 nanostructures were synthesized on ITO and FTO glasses by Spin Coating Technique at 3000 and 6000 rpm rotational speeds. Effects of substrate and rotational speed on the nanostructures were investigated. Structural, morphological and electrochromic properties of WO3 nanostructures were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Cyclic Voltammetry (CV) measurements respectively. İt was obtained monoclinic crystal structure, smooth and uniform surface properties for all of the samples. However, it was observed that ITO substrate and low rotational speeds at spin coating technique is more suitable than FTO substrate and high rotational speeds to achieve WO3 nanostructures with highly electrochromic performance.