1. Functional Materials Lab, Department of Physics, Air University, Sector E-9, Islamabad 44000, Pakistan
2. James Watt School of Engineering, University of Glasgow, Glasgow G12 8QQ, United Kingdom
3. School of Science and Technology, Hong Kong Metropolitan University, Ho Man Tin, Hong Kong
4. Institute of Biomedical and Genetic Engineering, 24 Mauve Area, Sector G-9/1, Islamabad 44000, Pakistan