1. Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
2. Center for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
3. Jyoti and Bhupat Mehta School of Health Sciences and Technology, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India