1. Physics Department, Faculty of Science, Taibah University, Almadinah Almunawarrah 42353, Saudi Arabia
2. Nanotechnology Centre, Taibah University, Almadinah Almunawarrah 42353, Saudi Arabia
3. Flinders Institute for Nanoscale Science and Technology, College of Science and Engineering, Flinders University, Adelaide, SA 5001, Australia