Morphology transformation and self-selective etching of ZnO nanostructures under centralized polarization field

Abstract

The morphology of ZnO nanostructures has great influence on its performance in device applications. In this paper, ZnO nanoflowers composed of nanorods have been synthesized by introducing a centralized polarization field in aqueous solution method. Meanwhile, with the decrease of precursor solution, obvious self-selective etching has been observed on ZnO (002) planes and the nanorods gradually transform to nanotubes. The room-temperature photoluminescence spectra show the UV emission, as well as the visible emissions which indicate the defects in the samples. Moreover, based on the SEM and XRD analysis, the possible growth mechanisms of different ZnO nanostructures were proposed.