1. Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata, 700 009, West Bengal, India
2. Center for Research in Nanoscience and Nanotechnology, Technology Campus, University of Calcutta, JD-2, Sector-III, Salt Lake, Kolkata, 700106, West Bengal, India
3. Department of Polymer Science and Technology, University of Calcutta, 92 A. P. C Road, Kolkata, 700009, India