1. Division of Materials, Mechanics and Structures, Nanotechnology and Advanced Materials Research Center, Faculty of Engineering, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia
2. Department of Materials Engineering, Faculty of Engineering and Built Environment, Tunku Abdul Rahman University College, Jalan Genting Kelang, 53300 Kuala Lumpur, Malaysia
3. Low Dimensional Materials Research Center, Department of Physics, Faculty of Science, University Malaya, 50603 Kuala Lumpur, Malaysia
4. School of Applied Physics, Faculty Science and Technology, University Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia