1. Physics, Faculty of Science and Engineering, Åbo Akademi University, Porthansgatan 3, 20500 Turku, Finland
2. Physical Chemistry, Faculty of Science and Engineering, Åbo Akademi University, Porthansgatan 3, 20500 Turku, Finland
3. Department of Materials Engineering, School of Chemical and Materials Engineering, National University of Science and Technology (NUST), H-12 Sector, 44000 Islamabad, Pakistan