1. Institute of Microengineering and Nanoelectronics
2. Universiti Kebangsaan Malaysia
3. 43600 Bangi
4. Malaysia
5. Low Dimensional Materials Research Centre (LDMRC)
6. Department of Physics
7. Faculty of Science
8. University of Malaya
9. Kuala Lumpur
10. National Cheng-Kung University
11. Tainan City 701
12. Taiwan
13. University of Azad Jammu and Kashmir
14. 13100 Muzaffarabad
15. Pakistan