Table of Contents
Advances in Chemistry
Volume 2014, Article ID 301410, 7 pages
Research Article

Effect of γ-Irradiation and Calcination Temperature of Nanosized ZnO/TiO2 System on Its Structural and Electrical Properties

1Physical Chemistry Department, Center of Excellence for Advanced Science, Renewable Energy Group, National Research Center, Dokki, Cairo 12622, Egypt
2Physical Chemistry Department, National Research Center, Dokki, Cairo 12622, Egypt
3Radiation Physics Department, National Center for Radiation Research and Technology (NCRRT), Nasr City, Cairo 11762, Egypt

Received 2 May 2014; Revised 3 June 2014; Accepted 13 June 2014; Published 18 August 2014

Academic Editor: Fabien Grasset

Copyright © 2014 Abdelrahman A. Badawy et al. 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.


ZnO/TiO2 powders were synthesized by sol-gel method using ammonium hydroxide. The effects of calcination temperature (500–1000°C) and gamma rays (with doses from 25 to 150 kGy) on the phases present and their electrical properties were investigated. The results revealed that heating the system investigated at 500°C led to the formation of ZnTiO3-rohom and TiO2-rutile. The degree of crystallinity of the phases produced increased by increasing the calcination temperature. When heating at 1000°C, ZnTiO3-rohom turned to ZnTiO3-cubic but the rutile phase remained stable. γ-Irradiation decreased considerably the crystallite size of the rutile phase from 146 to 63 nm and that of ZnTiO3-cubic decreased from 101 to 39 nm. This treatment led also to the creation of holes in the matrix of irradiated solids which increased the mobility of charge carriers (electrons) leading to a significant increase in the electrical conductivity reaching to 102 to 103-fold.