1. Center of Nanotechnology, King Abdulaziz University, Jeddah 21589, Saudi Arabia
2. K. A. CARE Energy Research and Innovation Center, King Abdulaziz University, Jeddah 21589, Saudi Arabia
3. Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
4. Department of Physics, Faculty of Science, Gombe State University, P.M.B. 127 Gombe, Nigeria
5. Nagoya Industrial Science Research Institute, Nagoya 464-0819, Japan