1. U.S.-Pakistan Centre for Advanced Studies in Energy (USPCAS-E), National University of Sciences and Technology (NUST), H-12 Sector, 44000 Islamabad, Pakistan
2. Faculty of Chemistry and Chemical Technology, University of Ljubljana, Vecna Pot 113, Sl-1000 Ljubljana, Slovenia
3. Nanosciences and Technology Department (NS&TD), National Centre for Physics (NCP), 44000 Islamabad, Pakistan