1. Department of Chemistry, The University of Lahore, Lahore, Pakistan
2. Centre for Inorganic Chemistry, School of Chemistry, University of the Punjab, Lahore, Pakistan
3. Department of Chemistry, University of Chakwal, Chakwal-48800, Pakistan
4. College of Science, King Saud University, P.O. Box-2455, Riyadh-11451, Saudi Arabia
5. Institute of Chemistry, University of Sargodha, Sargodha-40100, Pakistan
6. Department of Chemistry, The University of Gujrat, Gujrat, Pakistan
7. Department of Chemistry, Govt. College University, Lahore, Pakistan
8. Graphene Research Institute and Institute of Nano and Advanced Materials Engineering, Sejong University, Seoul, 143-747, Republic of Korea