Correlation between native defects and morphological, structural and optical properties of ZnO nanostructures

ZnO nanostructures are synthesized using chemical vapor deposition method. Well-distributed ZnO nanowires, nanogrenades and nanoislands are obtained by altering the temperature of joining the reactant gas O-2 from 550 to 570 and 600 degrees C, respectively. The structural properties are derived from the X-ray diffraction patterns and Raman spectra. It is indicated that all the samples are c-oriented wurtzite ZnO. Photoluminescence spectra also indicate that ZnO nanogrenades present fewer native defects because of their lower relative intensities of visible to ultraviolet emissions (1.1) than that of ZnO nanowires (3.1) and nanoislands (1.9). The visible emission of photoluminescence spectrum is divided into green and yellow luminescence which are attributed to defects of oxygen vacancy and surface disorder, respectively. And it is found different proportions of oxygen vacancy and surface disorder of variform ZnO nanostructures. (C) 2016 Elsevier B.V. All rights reserved.