Effect of hydrothermal reaction conditions on the optical properties of ZnO nanorods

摘要

Higher ZnO nanorod growth rates were obtained in separate pH levels of hydrothermal solution, 10.6 and 13.0. ZnO nanorods synthesized in a solution with a pH of 10.6 exhibited improved optical properties over those synthesized in a solution with a pH of 13.0. It is suggested that fewer oxygen deficiencies, a stoichiometric ZnO structure, and less influence of structure defects are the reasons for improved optical properties for the ZnO nanorods synthesized at a pH of 10.6. From the fact that Zn(NH3)(4)(2+) is a main reaction species)2 at a pH of 10.6, it is believed that the reaction path via Zn(NH3 4+ has an advantage in exhibiting better optical properties of ZnO nanorods. (c) 2007 Elsevier B.V. All rights reserved.