1. Low Dimensional Materials Research Centre
2. Department of Physics
3. University of Malaya
4. Kuala Lumpur 50603, Malaysia
5. Centre for High Impact Research
6. Faculty of Engineering
7. University of Nottingham Malaysia Campus
8. , Malaysia
9. Department of Materials Science and Engineering
10. National Tsing Hua University
11. Hsinchu 30013, Republic of China