1. Center of Nanotechnology King Abdulaziz University Jeddah 21589 Saudi Arabia
2. Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Saudi Arabia
3. Department of Mechanical Engineering College of Engineering Prince Sattam bin Abdulaziz University Al Kharj 16273 Saudi Arabia
4. Nagoya Industrial Science Research Institute Nagoya 464‐0819 Japan