1. Department of Polymer Science and Technology, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
2. Department of Chemistry, Acharya Jagadish Chandra Bose College, 1/1 B, A. J. C. Bose Road, Kolkata 700020, India
3. Center for Research in Nano Science and Nano Technology, University of Calcutta, JD-2, Sector III, Salt Lake City, Kolkata 700106, India
4. Department of Physics, National Institute of Technology, Durgapur 713209, West Bengal, India
5. Department of Physics, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
6. Department of BAS, National Institute of Technology Arunachal Pradesh (NITAP), Arunachal Pradesh 791110, India
7. Department of Ceramic Engineering, Indian Institute of Technology (BHU), Varanasi 221005, UP, India