1. Institute of Chemical Sciences, University of Peshawar, Peshawar, Pakistan
2. CAS Center for Excellence in Nanoscience, CAS Key Laboratory for Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, P. R. China
3. University of Chinese Academy of Science, Beijing, P. R. China
4. Women University of Azad Jammu and Kashmir, Bagh, Pakistan