1. Department of Physics, Riphah International University, 13-km Raiwind Road, Lahore 54000, Pakistan
2. Department of Physics & Astronomy and Graphene Research Institute-Texas Photonics Center International Research Center (GRI−TPC IRC), Sejong University, Seoul 05006, Korea
3. Nanotechnology Research Laboratory, Faculty of Engineering Sciences, GIK Institute of Engineering Sciences and Technology, Topi 23640, Khyber Pakhtunkhwa, Pakistan
4. Department of Chemistry, Inha University, 100 Inharo, Incheon 22212, Korea