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, South Australia 5001, Australia
4. Queensland Micro- and Nanotechnology Centre and School of Engineering and Built Environment, Griffith University, Nathan, Queensland 4111, Australia