1. Department of Chemistry, Jadavpur University, Kolkata, West Bengal, India;
2. Nanobiotechnology Laboratory, Department of Life Science and Biotechnology, Jadavpur University, Kolkata, West Bengal, India;
3. Department of Microbiology, University of Calcutta, Kolkata, West Bengal, India;
4. Department of Chemistry, Aliah University, Kolkata, West Bengal, India