1. Centre for Nanotechnology, IIT Guwahati, Guwahati, Assam, India
2. Department of Electronics and Electrical Engineering, IIT Guwahati, Guwahati, Assam, India
3. Department of Chemistry and the Centre for Nanotechnology, IIT Guwahati, Guwahati, Assam, India
4. Department of Electronics and Electrical Engineering and the Centre for Nanotechnology, IIT Guwahati, Guwahati, Assam, India