1. Centre for Research in Nanoscience and Nanotechnology, University of Calcutta, Technology Campus, Block JD2, Sector III, Salt Lake, Kolkata 700098, India
2. Amity Institute of Biotechnology, Amity University, Kolkata 700135, India
3. Elettra—Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5 in Area Science Park, Basovizza, 34149 Trieste, Italy
4. Department of Physics, Abhedananda Mahavidyalaya, University of Burdwan, Sainthia, Birbhum 731234, West Bengal, India