1. NPU-NCP Joint International Research Center on Advanced Nanomaterials & Defects Engineering, Shaanxi Engineering Laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
2. Department of Physics, Allama Iqbal Open University, Sector H-8, Islamabad 44000, Pakistan
3. Department of Physics and Applied Mathematics, Pakistan Institute of Engineering and Applied Sciences, Lehtrar Road, Islamabad 44000, Pakistan