Tuesday, 31 May 2016
Exhibit Hall H (San Diego Convention Center)
Nanostructured ZnO materials have received considerable interest from scientists due to their remarkable performance in electronics, optics and photonics.In recent years, ZnO nanostructures with one-dimensional (1D) and two-dimensional (2D) morphologies, such as nanorods, nanobelts, nanowalls and nanoflowers, have been synthesized. Previous research has suggested that providing multiple types of nanostructures is significantly better than just a single type. In this paper, we used Al layers of various thicknesses as a reaction layer to synthesize an array of vertical nanorods and nanowalls on a ZnO-coated substrate. Previous studies reported that Al undergoes chemical reactions under alkaline conditions in the presence of amines (hexamethylenetetramine: HMTA). Our findings indicate that an increase in the Al3+ ion concentration in the precursor solution leads to a morphological evolution from nanorods to nanowalls. Measurements of cathodoluminescence (CL), X-ray diffractometry (XRD), and SEM-EDS confirm that the resulting structures are pure ZnO with good crystallinity. We also investigated the optical properties of these ZnO nanostructures and propose a possible growth mechanism.
