1. Faculty of Engineering Sciences; GIK Institute of Engineering Sciences and Technology; Topi Khyber Pakhtunkhwa 23640 Pakistan
2. Institute of Industrial Biotechnology; GC University Lahore; Lahore 54000 Pakistan
3. Department of Physics & Graphene Research Institute; Sejong University; Seoul 143-747 Korea
4. Department of Electrical Engineering; Sarhad University of Science and Information Technology; Peshawar Pakistan