1. Low Dimensional Materials Research Centre
2. Department of Physics
3. Faculty of Science
4. University of Malaya
5. 50603 Kuala Lumpur
6. School of Chemistry
7. Madurai Kamaraj University
8. Madurai-625021
9. India
10. Department of Chemistry
11. Universiti Putra Malaysia
12. 43400 UPM Serdang
13. Malaysia
14. School of Engineering and Mathematical Sciences
15. City University London
16. London EC1V0HB
17. UK