1. Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
2. School of Chemistry and Centre for Nanotechnology, University of Hyderabad, Gachibowli, Prof. C. R. Rao Road, Hyderabad-500046, India
3. Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India