Table of Contents Author Guidelines Submit a Manuscript
Journal of Nanomaterials
Volume 2012, Article ID 957035, 6 pages
http://dx.doi.org/10.1155/2012/957035
Research Article

Enhancement of Photoluminescence Lifetime of ZnO Nanorods Making Use of Thiourea

1Department of Physics, Faculty of Education, Atatürk University, 25240 Erzurum, Turkey
2Advanced Materials Research Laboratory, Department of Nanoscience & Nanoengineering, Graduate School of Natural and Applied Sciences, Atatürk University, 25240 Erzurum, Turkey
3Department of Chemistry, Faculty of Science, Atatürk University, 25240 Erzurum, Turkey

Received 7 March 2012; Revised 10 May 2012; Accepted 13 May 2012

Academic Editor: Vo-Van Truong

Copyright © 2012 Erdal Sönmez and Kadem Meral. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We have investigated correlation of photoluminescence lifetime between zinc oxide (ZnO) nanorods and thiourea-doped ZnO nanorods (tu: CH4N2S). Aqueous solutions of ZnO nanorods were deposited on glass substrate by using pneumatic spray pyrolysis technique. The as-prepared specimens were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and time-resolved photoluminescence spectroscopy (TRPL). The photoluminescence lifetime of ZnO nanorods and ZnO nanorods containing thiourea was determined as 𝜏 = 1 . 5 6 ± 0 . 0 5  ns ( 𝜒 2 = 0 . 9 ) and 𝜏 = 2 . 1 2 ± 0 . 0 3  ns ( 𝜒 2 = 1 . 0 ) , respectively. The calculated lifetime values of ZnO nanorods revealed that the presence of thiourea in ZnO nanorods resulted in increasing the exciton lifetime. In addition to the optical quality of ZnO nanorods, their exciton lifetime is comparable to the longest lifetimes reported for ZnO nanorods. The structural improvement of ZnO nanorods, containing thiourea, was also elucidated by taking their SEM images which show the thinner and longer ZnO nanorods compared to those without thiourea.