Optical Properties of ZnO Nanowires and Nanorods Synthesized by Two Step Oxidation Process

Ghafouri, Vahid; Shariati, Mohsen; Ebrahimzad, Akbar

doi:10.7508/jufgnsm.2013.01.003

Optical Properties of ZnO Nanowires and Nanorods Synthesized by Two Step Oxidation Process

Document Type : Research Paper

Authors

Vahid ghafouri ¹

Mohsen Shariati ¹

Akbar Ebrahimzad ²

¹ Research Institute of Applied Sciences (ACECR), Shahid Beheshti University, Physics faculty member

² Research Institute of Applied Sciences (ACECR), Shahid Beheshti University

10.7508/jufgnsm.2013.01.003

Abstract

ZnO nanowires with a diameter of 70 nm and nanorods with a diameter in the range of 100-150 nm and two micrometer in length were grown on glass substrates by resistive evaporation method and applying a two step oxidation process at low temperatures, without using any catalyst, template or buffer layer. XRD pattern of these nanostructures indicated a good crystallinity property with wurtzite hexagonal structure. Photoluminescence measurement revealed three band emissions; one sharp strong peak in the UV region and two weaker peaks in the visible region, indicate good optical properties of nanorods synthesized by this method. Heat treatment in oxygen-rich atmosphere results to decrease of deep-level emission intensity in the PL spectra. The relatively high intensity of UV emission implies that this approach is a simple and promising method for fabricating ZnO nanorods in order to be used in optoelectronic devices especially in the UV range of the spectrum.

Keywords

ZnO Nanowires

Nanorod

Resistive Evaporation

oxidation

Photoluminescence