1. Department of Physics
2. Indian Institute of Technology Guwahati
3. Guwahati-781039
4. India
5. Tata Institute of Fundamental Research
6. Hyderabad-500 107
7. Nanoscale Physics Research Laboratory
8. School of Physics and Astronomy
9. University of Birmingham
10. Birmingham B15 2TT
11. UK
12. Centre for Hydrogen and Fuel Cell Research
13. School of Chemical Engineering
14. Birmingham
15. Centre for Nanotechnology