1. Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
2. Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, 603203, Tamil Nadu, India
3. Centre for Nanotechnology, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India